量子光学与光量子器件国家重点实验室--简介

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报告题目:宇称-时间光力学

报告人:景辉 教授 (湖南师范大学)

时间:2019.12.12(周四)上午11:00

地点:光电所二层报告厅

摘要作为光学发展史上的里程碑之一,光力学在引力波探测、光镊、量子态操控与量子信息处理等方面已经展示出广阔而重要的应用前景,同时,具有宇称-时间对称性的光学系统在奇异点处的物性发生剧烈变化,出现诸多新奇效应,有望为量子精密测量带来颠覆性的新技术。我们结合两个领域提出宇称-时间光力学理论,预言了超低阈值声子激光、反转光力透明、力学灵敏传感等新奇效应,理论预言已获得美国华盛顿大学实验验证。我将汇报这方面的工作及新进展,如量子奇异点效应,量子非互易效应,以及反宇称-时间对称破缺的陀螺仪。

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报告题目:Simulating chiral phenomena with ultracold atomic gases: from s-band to p-band, from real-space to momentum-space

报告人:李永强 副教授(国防科技大学)

时间:2019.10.24(周四)下午5:00

地点:光电所二层报告厅

摘要The interplay of spin, orbital, and charge degrees of freedom is one of the cornerstones of correlated quantum materials. Many intriguing quantum phases of electronic matter can be attributed to higher order electronic orbitals and spin-orbital interactions, e.g., in exotic superconductivity in pnictides and strontium ruthenates, as well as in various topological insulators and Weyl semimetals. In this talk, we mainly focus on two issues:                  
First, we propose a mechanism of spontaneous generation of spin angular-momentum coupling with spinor atomic bosons loaded into p-orbital bands of a two-dimensional optical-lattice. This spin angular momentum coupling originates from many-body correlations and spontaneous symmetry breaking in a superfluid, with the key ingredients attributed to spin-channel quantum fluctuations and an approximate rotation symmetry. The resultant spin angular-momentum intertwined superfluid has Dirac excitations.                  
Second, we propose to study the many-body chiral edge current of ultracold gases in a momentum-space superradiance lattice by coupling with a Rydberg state. We explore stationary and dynamical properties of the momentum-space lattice in an artificial magnetic field. The many-body ground states support both chiral and anti-chiral edge currents in momentum space. Their stability against strong interactions is verified by a dynamical mean-field simulation. We show that the interplay of the interaction and chirality leads to correlated chiral dynamics, where an interaction-induced excitation blockade in momentum space suppresses the edge currents. When incorporating an effective decay to the lattice, we find that excitation transportation, whose dynamics is governed by a dissipative Bose-Hubard model, can be prohibited by a strong local dissipation, as a result of the quantum Zeno effect.

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报告题目:量子力学与哲学(上、下)

报告人:张天蓉  科普作家

时间:2019年10月14日(周一)下午4:00(上) 
   
2019年10月15日(周二)下午4:00(下)

地点:光电所二层报告厅

摘要从简单回顾量子力学引发的几个哲学问题开始,然后重点介绍 “自由意志定理”,简单叙述人类有关自由意志的思考,宗教及伦理方面的意义等,最后解读2006年普林斯顿两位数学家(John Conway和Simon Kochen)所证明了的一个量子力学数学定理,即自由意志定理:“如果人有自由意志,那么亚原子粒子也有自由意志。”

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报告题目:统计物理里的病态极限

报告人:陈昌晔 教授(北京航空航天大学)

时间:2019年10月14日(周一)下午5:00

地点:光电所二层报告厅

摘要本文揭示了某些统计物理里的多变量极限是数学上病态定义的,沿着这条路线,本文说明借助于重新定义、重新解释和重新计算这些极限,非平衡态气体动力学可能获得重大进展。

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报告题目:继续量子革命

报告人:施郁 教授 (复旦大学)

时间:2019.9.30(周一)上午10:00

地点:光电所二层报告厅

摘要量子力学是微观物理学的基本理论框架。它确立90年来,在物理学基础与应用的方方面面,取得了一个又一个的成功。量子力学还在进一步发展中,被称为“第二次量子革命”。本人认为量子革命一直在持续地发生,并将继续下去,可能会引来“量子革命的第二次高潮”。

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报告题目:Spontaneous pattern formation in a driven Bose-Einstein Condensate

报告人:Prof. Cheng Chin  (James Franck Institute, Enrico Fermi Institute and Department of Physics,University of Chicago) 

时间:2019年9月9日(周一)下午5:00

地点:光电所二层报告厅

摘要Pattern formation is ubiquitous in nature, from morphogenesis, cloud formation to galaxy filamentation.  More often than not, patterns arise in a medium far from equilibrium due to the interplay between dynamical instability and nonlinear wave mixing. We report, based on momentum and real space pattern recognition, spontaneous formation of density patterns with D2, D4and D6 symmetries in Bose-Einstein condensates with atomic interactions driven at two frequencies.  The symmetry of the pattern is controlled by the ratio of the frequencies.  The D6 density waves, in particular, arise from a resonant wave mixing process that coherently correlates and enhances all 6 excitations that support the symmetry.

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报告题目:Non-equilibrium physics in a Strongly Interacting Fermionic Superfluid

报告人:Kuiyi Gao(Physikalisches Institut, University of Bonn)

时间:2019.8.19(周一)下午5:00

地点:光电所二层报告厅

摘要Ultra-cold Fermi gases with tunable interactions have been widely used to investigate the BEC-BCS crossover in the last decade. Dynamics and thermalization in strongly interacting atomic Fermi gases was proposed to study excitations and pairing in superconductivity. In this talk, I will show our experiments in exploring non-equilibrium dynamics in strongly interacting Fermi gas of 6Li atoms. With a periodic modulation of the order parameter, the amplitude mode with frequency around 2 ? /h was observed. With interaction quenches around unitary limit, dynamics and thermalization beyond collisionless BCS theory were found.

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报告题目:Fracton topological order

报告人:叶鹏 教授(中山大学)

时间:2019.8.12(周一)上午11:00

地点:光电所二层报告厅

摘要Fractons are a class of topological excitations whose spatial mobility is highly restricted. In other words, it is impossible to construct a quantum operator that is able to “move” the fraction point-like particle freely. In this talk, I will introduce our recent work on “fracton topological order” especially focusing on the generalization of exactly solvable models and fractonic many-body physics.

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报告题目:Complete spin filtering in molecular junctions by quantum interference

报告人:Dr. Dongzhe Li (University of Konstanz)

时间:2019年7月11日(周四)下午5:00

地点:光电所二层报告厅

摘要Generating efficient and highly spin-polarized currents through nanoscale junctions is essential in the field of nanoelectronics and spintronics. In this talk, coupling state-of-the-art ab initio electron transport calculations and shot noise measurements, I will give the first demonstration to obtain complete spin filtering in molecular junctions based on symmetry arguments and spin-dependent quantum interference effects. In particular, a mechanical strain can be used to modify the nanojunction symmetry switching on or off new conduction channels. I will first illustrate the physical mechanism on the basic molecular junction of benzene and generalize it in vanadocene junction to explain recent shot noise measurements of an almost fully open spin-polarized transmission channel. Remarkably, the majority-spin conductance is completely suppressed due to destructive quantum interference, resulting in perfect spin filtering. Therefore, a single molecule act as a half-metallic conductor although free organic molecule is actually an insulator. These findings pave the way for spin transport manipulations by quantum interference at the single nanometer scale.

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报告题目:Multipartite entanglement: from triplet photon generation, coupled nonlinear waveguides to frequency coding

报告人:Prof. Kamel Bencheikh (Centre of Nanoscience and Nanotechnology – C2N, Université Paris-Sud - Université Paris-Saclay, France)

时间:2019年6月13日(周四)下午5:00

地点:光电所二层报告厅

摘要Entanglement has morphed from thought experiments into laboratory reality in a century and is the cornerstone of future quantum technologies. The enormous potential of entanglement to secure and parallelize information processing and transmission can only be achieved by relying on innovative sources and platforms and custom detection systems. I will in my talk address the issue of the sources we are exploring in our group at C2N.Triple photon generation It is based on a third order nonlinear optical interaction and it is the most direct way to produce pure quantum three-photon states. These states can exhibit three-body quantum entanglement and their statistics go beyond the usual Gaussian statistics of coherent sources and optical parametric twin-photon generators, offering new tools for quantum mechanics. Nonlinear waveguide arrays provide an integrated platform for quantum information compatible with telecom wavelength. By engineering their design, controlling the coupling strength between adjacent waveguides and the strength of the nonlinearity, we can generate entanglement among the modes propagating in the arrays.The third avenue we are exploring in our group is the frequency domain quantum information where qubit or high dimensional quantum bits are encoded on distinguishable optical frequencies.During my talk, I will discuss these three avenues focusing on our results on triple photons states and coupled nonlinear waveguides and will mention our starting project on frequency domain quantum information.

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报告题目:光致超声推动流体和激光驱动微流控泵

报告人:王志明 教授(电子科技大学)

时间:2019522日(周三)下午5:00

地点:光电所二层报告厅

摘要如何有效地对宏观液体进行精细操控对于微流体芯片实验室、微制造、生物芯片、医药和生命科学是十分重要的研究领域,而利用激光驱动液体流动更是科研界的重大难题。光子的动量传输作用极为微弱,激光透射水的光热效应产生的表面张力差也很微弱,无法实现对宏观液体的推动。王志明教授团队提出了一种全新的光流体学机理:声效应和声波驱动流体效应。通过脉冲激光入射装有金纳米颗粒水溶液的比色皿,首次利用脉冲激光在水中实现持续高速达4 cm/s的水流喷射。在此基础上,课题组制成了一种不包含微细加工结构和活动组件的新型微流控泵。该泵基于光致超声驱动流体的原理,通过简单的金注入石英基板制成。在脉冲激光激发下,石英基板上的任意一个点即可产生定向的长时间持续的超声波以推动流体运动。通过程序化地操控激光束可以非常容易地实现单泵,动态泵和多泵模式。这种激光驱动的微流控泵为微泵技术的发展打开了新的大门,为微流控泵的集成化和多功能化应用提供了新的机会,推动了微流控芯片技术,超声药物输送,医疗手术等领域的发展。

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报告题目:Precision measurements beyond standard quantum limit in vapor cells

报告人:肖艳红 教授(复旦大学物理学系)

时间:2019年5月17日(周五)下午5:30

地点:光电所二层报告厅

摘要Measurements lay at the foundation of physical science, and their ultimate precision is normally set by the standard quantum limit (SQL). Entangled states such as spin squeezed states, squeezed light can be used to break such limit, but previous experiments have largely been proof-of-principle, i.e., the absolute precision of those measurements, although beyond SQL, is relatively low. We have recently achieved spin squeezing for more than 100 billion atoms in a macroscopic vapor cell, exceeding the best angular resolving power in any spin squeezed state so far by 1000 times, with the aid of adiabatic pulse control and motional averaging. In a similar setup, a femtotesla level atomic magnetometer operated at room temperature was demonstrated, using a new weak-measurement spectroscopy. These results show potential benefits of entangled states even in practical and high-precision systems. In parallel, we are developing novel quantum light sources such as squeezed light array, quantum correlated beam array, by employing coherent diffusion of polaritons in vapor cells.  Such light sources will find applications in quantum information science as well as quantum metrology.

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报告题目:从团簇科学到原子制造

报告人:宋凤麒 教授(南京大学物理学院)

时间:2019年5月13日(周一)下午4:30

地点:光电所二层报告厅

摘要 原子制造是从原子极限水平制造材料与器件的新兴学科,是人类微制造趋势发展的必然趋势。团簇是具有若干个原子的结构和性质相对稳定的原子聚集体,是原子制造研究的一个方向。本报告给大家汇报南京大学团簇研究组逐渐走向原子水平的一些成果:
1)原子团簇束流与质量选择技术
2) 单团簇器件制造与输运研究
3) 等离激元的原子截止极限
4) 团簇修饰拓扑绝缘体器件与电子输运研究

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报告题目:激光医学在临床中的应用

报告人:顾瑛 中国科学院院士(中国人民解放军总医院)

时间:2019年5月9日(周四)上午10:00

地点:光电所二层报告厅

摘要 顾瑛,激光医学专家,中国科学院院士,中国人民解放军总医院激光医学科主任医师、教授、博士生导师,量子光学与光量子器件国家重点实验室学术委员会委员。顾瑛院士主要从事激光在临床医学中的应用研究。完成了血管靶向光动力疗法的理论和机理、药物和设备、技术和方法、应用和规范的系统性研究,开创了血管靶向光动力治疗的新学术方向和应用领域。合作研发出国家化学1.1类血管靶向光动力治疗新药——海姆泊芬。主持制定了中国首部激光医学临床技术操作规范和诊疗指南。发表学术论文180余篇,撰写专著1部。科研成果获国家发明奖1项、军队科技进步二等奖2项。

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报告题目:自旋轨道耦合冷原子中的新奇量子相

报告人:韩伟 副研究员(中国科学院国家授时中心)

时间:2019年5月8日(周三)下午4:30

地点:光电所二层报告厅

摘要超冷原子气体是将稀薄原子团冷却到绝对零度附近,来研究体系的新奇量子现象和遵循的物理规律。超冷原子气体研究已成为当前原子分子物理、非线性与量子光学、统计和凝聚态物理等学科的重要交叉领域,无论是从基础物理研究层面(如量子调控、量子模拟、探索新物态等),还是从发展高新技术层面(如原子激光、原子干涉仪、原子芯片、原子钟、量子计算机等)都具有十分重要的意义。本报告将结合超冷原子气体最新研究进展和国际前沿动态,介绍自己在自旋轨道耦合超冷原子新物态(如手性超固态)、奇异拓扑元激发(如双量子自旋涡旋态、自旋畴壁)、新奇量子效应等方面的代表性研究工作。
简介:  韩伟,中国科学院国家授时中心副研究员,中国科学院大学硕士生导师。于2013年获得山西大学理学博士学位。长期从事超冷原子物理、玻色-爱因斯坦凝聚等方面的研究,在超冷原子新物态以及奇异拓扑元激发等方面做出了一系列工作。作为项目负责人先后主持国家自然科学基金项目(2项)和省部级科研项目(2项目)。近年来在Physical  Review Letters, Physical Review  A等期刊发表SCI学术论文20余篇。参与撰写冷原子物理学术著作一部,由《World Scientific  Publishing Company》出版。

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报告题目:Strong-field, ultrafast, and attosecond  physics and the semiclassical models

报告人:Dr.Nikolay Shvetsov-Shilovskiy  (Institute for Theoretical Physics, Leibniz University Hanover)

时间:2019年4月30日 (周二) 下午4:00

地点:光电所二层报告厅

摘要Strong-field, ultrafast, and attosecond physics are new and promising  research avenues resulting from remarkable developments in laser  technologies during the last three decades. In accord with the common  definition, a "strong" laser field corresponds to the electric field  strength comparable to that acting on an electron in a hydrogen atom.  The "ultrafast" time scales typically refer to laser pulses of  femtosecond duration. In contrast to this, attosecond science studies  dynamics of quantum systems on the timescale less than a femtosecond.  These time scales imply a great diversity of possible applications, both  is science and technology. We present a brief overview of these  applications and discuss the nonlinear phenomena originating from  interaction of strong laser radiation with atoms and molecules.  Semiclassical models employing classical equations of motion to describe  the electron motion in the continuum are one of the widely used  theoretical approaches in strong-field physics. We overview  trajectory-based simulations of the main strong-field phenomena.  Finally, we discuss semiclassical perspectives of strong-field  photoelectron holography - a new and promising method capable to  visualize molecular dynamics in real time.

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报告题目:Phase transition in a  spin-orbital-angular-momentum coupled Bose-Einstein condensate

报告人:江开军 研究员(中科院武汉物理与数学研究所)

时间:2019年4月17日(周三)下午4:30

地点:光电所二层报告厅

摘要Coupling between particle’s spin and orbital motion (linear momentum or  orbital angular momentum) is ubiquitous in atoms, photons, solid  materials and many other systems. It contributes to the topological  properties like quantum-Hall effect in solid materials and electronic  fine structure in atoms. Ultracold atoms with a high tunability provides  an ideal platform to study spin-orbit (SO) coupling.  Spin-linear-momentum (SLM) coupling has been observed in quantum gases  and subsequently a variety of exotic quantum states have been explored.  While the experimental study on the other kind of SO coupling, namely  the spin-orbital-angular-momentum (SOAM) coupling, is still lacking. 
      In this talk, I will report the experimental  observation of the ground-state phase diagram of the SOAM coupled  Bose-Einstein condensate. By inducing a Raman transition using a pair of  Gaussian and Laguerre-Gaussian (LG) laser beams, we realize SOAM  coupling of ultracold atoms. We observe phase transitions when the  two-photon Raman coupling strength or detuning approaches the critical  value. The phase transitions are classified as the first order, which  feature a discontinuous jump of the angular momentum (OAM) and the spin  polarization. We demonstrate the hysteresis loop across the first-order  phase transition. The role of interatomic interaction on the phase  transition is also elucidated.

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报告题目:用于空间引力波探测的星间激光干涉测量技术

报告人:叶贤基 教授/副主任(中山大学物理与天文学院 天琴中心)

时间:2019年4月2日(周二)下午3:00

地点:光电所二层报告厅

摘要: 经过100年的努力,LIGO研究组科学家在2016年宣布测到了爱因斯坦广义相对论的最后一项预言-引力波。引力波探测将验证强引力场下的引力理论,并开启引力波天文学新纪元。地面引力波天线只能探测频率高于10Hz的引力波信号,而空间引力波天线能探测更低频、更稳定、更多类型的引力波源,是研究引力波天文学的最重要探测手段。本报告将介绍空间引力波探测所需要的核心关键技术-星间激光干涉测量技术,内容包含:基本原理、系统组成、指标需求,天琴研究中心在星间激光干涉测量技术研究的最新进展。

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报告题目:囚禁离子量子模拟与计算

报告人:王钊 副研究员(中山大学)

时间:2019.3.22(周五)下午5:00

地点:光电所二层报告厅

摘要: 囚禁离子系统在各物理系统中可控性很强,态制备及测量保真度最高的物理系统,因此最有可能实现大规模量子计算。目前在单个离子阱系统内可以实现超过容错量子计算阈值的高保真度态制备、态测量、单(双)比特高保真度逻辑门操作,因此提高扩展性是离子系统最重要发展方向。报告介绍了离子阱量子系统的基本实现原理和方法,提高纠缠量子比特数量、实现量子网络的主要方法,以及目前实验进展。

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报告题目:Quantum gate teleportation between separated zones of a trapped-ion processor

报告人:万雍 博士(National Institute of Standards and Technology, Boulder, USA)

时间:2019年3月2日(周六)上午10:00

地点:光电所二层报告厅

摘要:Scaling up trapped-ion quantum information processors implies that above some size, qubits will likely need to be distributed across multiple processing zones. Harnessing the full power of such an architecture for quantum information processing requires a method to connect qubits in separate locations. The “quantum charge-coupled device” architecture allows to couple distant qubits by first physically moving them together, but at the same time imposes overhead from time spent on shuttling ions. An alternative solution is to employ a teleported two-qubit entangling gate that uses only local operations in two separate locations, classical communication between these locations, and a shared entangled qubit pair as a resource. This approach has been demonstrated probabilistically in photonic systems with post-selection and only recently performed deterministically between two superconducting cavity qubits by means of an entangled pair of transmons. Here we demonstrate a deterministic teleported CNOT gate between two beryllium ion qubits in spatially separated zones of a segmented Paul trap, using an entangled pair of magnesium ion qubits as the resource. We perform full process tomography on the two beryllium ions, and infer a 95% confidence interval [0.845, 0.872] for the CNOT entanglement fidelity using maximum likelihood (ML) estimation. To characterize consistency with a single quantum process and to discover unchecked fluctuations, we apply a likelihood-ratio test to the tomography data, which indicates an unexpected level of inconsistency. We verify through numerical simulation and independent measurements on the experimental setup that slow drifts in some laser beamlines was likely the cause of this inconsistency, suggesting the importance of such consistency checks in addition to other benchmarking techniques. Our experiments combine ion shuttling with individually-addressed single qubit rotations and detection, high fidelity same- and mixed-species two qubit gates, and real-time conditional operations, thereby demonstrating a substantial fraction of the building blocks necessary for scaling trapped-ion quantum information processors.

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报告题目:超低损耗与高损伤阈值激光薄膜研究

报告人:王占山 教授(同济大学精密光学工程技术研究所)

时间:2019年1月29日(周二)上午10:00

地点:光电所二层报告厅

摘要: 超低损耗、低热噪声激光薄膜是激光测量系统的核心元件,如何从光学损耗、热噪声两方面控制激光薄膜性能是当前精密测量和薄膜光学领域的热点和难点。同济大学建立了集超低损耗激光薄膜设计、制备、表征于一体的研究平台,对薄膜的吸收、散射、透射损耗的物理机制与控制技术开展了深入研究,实现了吸收<2ppm,散射~5ppm,反射率~99.999%的超低损耗激光薄膜。构建了光学薄膜热噪声的理论模拟和优化方法,研究了掺杂薄膜机械损耗的变化规律,对光学薄膜机械损耗进行了精确表征。相关研究推动了我国超低损耗、低热噪声激光薄膜的发展,将为精密测量领域的发展提供关键技术支撑。同时,我们还建立了全流程定量化高损伤阈值激光薄膜研制体系,实现了激光薄膜制备的稳定性和重复性,已在神光系列激光系统与激光武器上得到了广泛应用。

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报告题目:Propagating surface plasmons on metal nanowires and their interaction with excitons in quantum dots    

报告人:魏红 研究员(中科院物理所)

时间:2019.1.11(周五)上午11:00

地点:光电所二层报告厅

简介:魏红,中国科学院物理研究所研究员,博士生导师。2004年毕业于山东大学物理学院,获学士学位,2009年毕业于中国科学院物理研究所,获博士学位。2011年入选中国科学院青年创新促进会;2012年荣获中国科学院物理研究所科技新人奖;2013年荣获中国科学院卢嘉锡青年人才奖;2014年入选中国科学院卓越青年科家项目,获基金委优秀青年科学基金项目资助,入选北京市科技新星计划;2016年荣获第九届饶毓泰基础光学奖。
      从事纳米光学和等离激元光子学的研究,主要工作集中于表面等离激元在纳米波导及其网络中的传播特性、纳米光学器件、表面增强光谱、等离激元-激子相互作用等。在Nano Letters、Nature Communications、PNAS等杂志发表论文40余篇,被SCI杂志引用2000余次,被邀请在重要国际学术会议上作邀请报告20余次。担任英国物理学会(IOP)出版社的Journal of Optics编委,担任美国光学学会(OSA)出版社的Journal of the Optical Society of America B的Topical Editor。

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报告题目:Integrated quantum photonics in silicon     

报告人:王剑威 研究员 (北京大学)

时间:2019.1.10(周四)下午4:30

地点:光电所二层报告厅

摘要:On-chip producing, controlling and detecting quantum states of light with large-scale silicon-photonic circuits opens the way to realizing complex quantum technologies for applications in the fields of computing, simulation and communication [1]. In this talk we present recent progress on large-scale silicon-photonic quantum technologies and applications, and discuss routes towards complex quantum information processing with photons. We reported a silicon-photonic device integrating around 550 components, able to generate, manipulate and measure high dimensional entanglement with high controllability and universality [2]. Universal two-qubit operations have been enabled recently by controlling a complex network of linear-optic devices [3]. A chip-to-chip quantum interconnect technology, allowing entanglement distribution and teleportation between separated chips, has been demonstrated going beyond a single-chip quantum system [4]. With the developed quantum photonic hardware it allows us to benchmark the simulation and characterizations of electron spin systems [5] and molecular systems with photons [6,7]. These results show silicon-integrated quantum photonic circuits as a versatile testbed for new quantum algorithms and as a route towards large-scale quantum information processing, pointing the way to applications in fundamental science and quantum technologies.

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报告题目:Quantum simulation of open systems with optically-trapped ultracold atoms  

报告人:罗乐 教授(中山大学)

时间:2019.1.9(周三)下午5:00

地点:光电所二层报告厅

摘要:Optically-trapped ultracold atoms have exhibit extraordinary ability to simulate the dynamics of closed quantum systems. But its potential as a simulator of open quantum systems has yet to be explored. Here we studied open quantum systems with balanced loss and gain which exhibit a transition which engenders modes that exponentially decay or grow with time and thus spontaneously breaks the parity-time (PT) symmetry.Such PT -symmetry breaking transitions have attracted many interests because of its extraordinary behaviors and functionalities absent in the closed systems. We have observed PT -symmetry breaking transitions by engineering time-periodic dissipation and coupling, which are realized through state-dependent atom loss in an optical dipole trap of ultracold 6Li atoms [1]. Comparing with a single transition appears for static dissipation, we find that the time-periodic counterpart undergoes PT -symmetry breaking and restoring transitions at vanishingly small dissipation strength in both single and multiphoton transitions domains, revealing rich Floquet phase structures and topological phenomena associated to time-periodic modulation.

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报告题目:Effects of quantum interference in microcavity polariton condensate    

报告人:薛艳 副教授(吉林大学)

时间:2018.12.28(周五)下午4:30

地点:光电所二层报告厅

摘要:Exciton polaritons in semiconductor microcavity constitute the archetypal system to investigate condensate in solid state materials with room temperature. Together with the consideration of microscale size and large nonlinearity, polariton condensate appears promising for polaritonic devices for all-optical information and communication processing. In this talk, I will first introduce some concepts and progress in the study about quantum interference in polariton condensate. Then I will introduce how to use quantum interference respectively in the spatial domain and in the temporal domain to study some issues such as the stability of dark polariton soliton and the polariton memory.

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报告题目:纳米光学和等离激元光子学基本问题研究

报告人:徐红星 院士(武汉大学)

时间:2018.12.26(周三)下午4:00

地点:光电所二层报告厅

简介:徐红星,中国科学院院士,武汉大学物理科学与技术学院教授,院长。长期从事表面增强光谱和等离激元光子学(plasmonics)方面的研究工作,在单分子表面增强光谱和纳米全光网络方面做出了开创性和系统性的工作。2010 获第十一届中国青年科技奖、2013 年获中国物理学会饶毓泰物理奖。在包括Nature Commun.,PRL,Nano Lett.,PNAS,JACS, Adv. Mater.等的国际著名科学杂志发表论文150余篇,其中影响因子>7的有42篇(其中30篇为第一或通讯作者)。全部论文近五年被SCI 杂志引用7000 余次,H 因子40,17篇论文被SCI杂志引用超过百次,最高单篇被引用1240余次,是1999年发表的所有PRL中引用最高的十篇文献之一,次高910余次,是2000年发表的所有PRE中引用最高的文献。在等离激元光子学领域最有影响力的四个国际会议(SPP, NFO, SPIE 的Plasmonics 分会,等离激元光子学前沿国际会议FOP)中,担任前三个会议的程序委员会委员和FOP 会议的三届大会主席,其中FOP2 被Nature Photonics 专栏报道。

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报告题目:Fermion-Mediated Interactions Between Bosonic Atoms

报告人:Prof. Cheng Chin (The University of Chicago)

时间:2018.12.24(周一)下午4:30

地点:光电所二层报告厅

摘要:In high energy and condensed matter physics, particle exchange plays an essential role in the understanding of long-range interactions. For example, the exchange of massive bosons leads to the Yukawa potential. Phonon exchange between electrons gives rise to Cooper pairing in superconductors. When a Bose-Einstein condensate (BEC) of Cs is embedded in a degenerate Fermi gas of Li, we show that interspecies interactions can give rise to an effective trapping potential, damping, and attractive boson-boson interactions mediated by fermions. The latter, related to the Ruderman-Kittel-Kasuya-Yosida (RKKY) mechanism, results from a coherent three-body scattering process. Such mediated interactions are expected to form novel magnetic phases and supersolids. We show that for suitable conditions, the mediated interactions can convert a stable BEC into a train of "Bose-Fermi solitons".

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报告题目:Quantum optics with strongly interacting atomic systems

报告人:李霖 教授 ( 华中科技大学 )

时间:2018年11月10日(周六)上午10:00

地点:光电所二层报告厅

摘要:Manipulation of light at the single quanta level is an essential goal in quantum optics, due to its importance for quantum communications/computations and testing of fundamental quantum mechanics. However, performing such quantum operations on photons in a deterministic way turns out to be extremely hard, as photons usually don’t interact with each other. Here we present some of the recent experiments where atomic systems are used to mediate the interaction between photons. By coupling light with high-lying Rydberg atoms or Cavity QED systems, atom-photon and photon-photon interactions can be effectively engineered. We demonstrate the on-demand generation of non-classical light states and light-atom entanglement with these systems.

简介:Lin's research focus on quantum information and quantum optics with Rydberg atoms and cavity QED. Lin started his Ph.D. in Prof. Kuzmich’s group at Georgia Institute of Technology in 2010, working on long-lived quantum memory and strongly-interacting Rydberg atoms. After moved to University of Michigan in 2014, Lin setup a new experiment single-handedly and investigated single-photon Rydberg excitations. From 2017 to 2018, Lin worked in Prof. Gerhard Rempe's lab at Max-Planck-Institute for Quantum Optics as a posdoc, studied the realization of Schrödinger's cat with cavity QED system. Lin joined Huazhong University of Science and Technology as a professor in Aug. 2018 and is currently setting up his cold atoms experiments.

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报告题目:人工微结构光场调控物理及应用

报告人:陈树琪 教授(南开大学物理科学学院)

时间:2018年11月7日(周三)下午5:00

地点:光电所二层报告厅

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报告题目:激光相干结构调控研究

报告人:蔡阳健 教授(山东师范大学物理与电子科学学院)

时间:2018年11月7日(周三)下午4:00

地点:光电所二层报告厅

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报告题目:基于悬浮光力学的量子模拟和量子时间晶体

报告人:尹璋琦 助理研究员(清华大学)

时间:2018年11月1日(周四)下午4:30

地点:光电所二层报告厅

摘要: 光悬浮的纳米系统具备超高的品质因子,可用于宏观量子叠加态的制备以及精密测量。在这里,我们讨论光悬浮包含氮-空位中心的纳米金刚石系统,在磁场下诱导出色心电子自旋与机械模式如质心运动或摆动模式之间的强耦合,进而制备其量子叠加态和实现多个色心间的有效耦合,模拟有限尺度的Lipkin-Meshkov-Glick (LMG) 模型。接下来,我们简要的介绍时间晶体的概念,并发现有限尺度的LMG模型基态附近能出现有效的量子时间晶体和时间准晶体现象。

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报告题目:Low-noise lasers and amplifiers for microwave photonics and metrology applications

报告人:Prof. Fabien Bretenaker(CNRS & ENS Paris-Saclay, France)

时间:2018年10月29日(周一)下午4:30

地点:光电所二层报告厅

简介:Fabien Bretenaker graduated from Ecole Polytechnique, France, in 1988. He received his PhD degree from University of Rennes, Rennes, France, in 1992 while working on ring laser gyroscopes for Sagem. He joined the Centre National de la Recherche Scientifique, Rennes, in 1994 and worked in Rennes until 2002 on laser physics and nonlinear optics. In 2003, he joined the Laboratoire Aimé Cotton, Orsay, France, working on nonlinear optics, laser physics, quantum optics, and microwave photonics. He is also a part time professor in Ecole Polytechnique, Palaiseau, France, and adjunct professor in Ecole Normale Supérieure Paris Saclay, Cachan, France and in Raman Research Institute in Bangalore, India.

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报告题目:Quantum thermalization in frozen Rydberg gases

报告人:Prof. Pierre Pillet(CNRS & ENS Paris-Saclay, France)

时间:2018年10月29日(周一)下午3:30

地点:光电所二层报告厅

简介:Pierre Pillet graduated from the Ecole Normale Supérieure (1973-1977), where he obtained his PhD degree (Thèse de troisième cycle) and the “Agrégation of Physics” both in 1977. In 1977 he joined the Centre National de la Recherche Scientifique, and worked at Laboratoire Aimé Cotton. In 1982 he got his “Thèse d’Etat” in Physical Sciences (Tenure) at University Paris-Sud. In 1982-1983 he joined the Stanford Research Institute (SRI International) at Menlo Park (California). He is today Director of Research (Exceptional class) in CNRS. He has headed the Laboratoire Aimé Cotton from 2001 to 2011, then he has headed the Laboratory of Excellence “Physics Atom Light Matter” (LabEx PALM of University Paris-Saclay) from 2011 to 2015. He has been Professor (part time) at Ecole Polytechnique from 1992 to 2006. Pierre Pillet is recognized for his pioneering works and developments in cold molecules and in cold Rydberg atoms.

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报告题目:Magnetometry with NV color centers in diamond: Application to nanophysics and high-pressure physics

报告人:Prof. Jean-François ROCH(ENS Paris-Saclay, France)

时间:2018年10月29日(周一)下午2:30

地点:光电所二层报告厅

简介:Jean-François Roch graduated in physics from the Ecole normale supérieure de Cachan and the University of Paris-Sud, with a PhD on quantum nondemolition measurements that he realized at the Institut d’Optique in Orsay (France). He was appointed in 1992 researcher at the CNRS. He continued his quantum optics work at the Institut d’Optique and then moved to the Ecole Normale Supérieure in Paris to join the group of the Physics Nobel Prize Serge Haroche where he investigated quantum effects associated to whispering gallery modes.
      In 1998, he became professor in physics at the Ecole Normale Supérieure de Cachan in 1998 which now became the ENS Paris-Saclay. There he started a research group on the quantum properties of single light emitters. For the past years, his research has been devoted to the application of single point defects in diamond as quantum sensors. After being the vice-rector of ENS Paris-Saclay in charge of research and innovation activities (2009-2011), he settled a joint research structure with the company Thales Research & Technology which aims to develop quantum sensing techniques and microwave photonics.
      Jean-François Roch is co-author of 135 publications, with 2 publications in Science. His current h-index is 41 (Web of Science).

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报告题目:10dB vacuum noise squeezing at 1064 nm in Taiwan

报告人:Prof. Ray-Kuang Lee(Institute of Photonics Technologies, National Tsing Hua University, Taiwan)

时间:2018年10月22日(周一)下午5:00

地点:光电所二层报告厅

摘要:In this talk, I will report our recent implementation of squeezed vacuum states at 1064 nm. With a bow-tie, optical parametric oscillator (OPO) cavity, and our home-made balanced homodyne detectors, noise reduction up to 10dB below the vacuum is measured. Applications of our squeezer to the gravitational wave detection will be discussed, with the collaboration with Japanese KAGRA project. At the same time, based on the niche of silicon photonics technologies and semiconductor industries in Taiwan, we will also introduce our proposal toward the implementation of scalable quantum photonic chips by integrating photonic qubits (single photon source, entangled photon pair, squeezed light), optical components based on silicon photonics, and photon detector arrays (single photon avalanche diode, homodyne detector).

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报告题目:有机光伏材料中的超快光电过程

报告人:张春峰 教授(南京大学)

时间:2018年10月11日(周四)下午5:00

地点:光电所二层报告厅

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报告题目:半导体胶体纳米晶的单粒子光学特性研究

报告人:王晓勇 教授(南京大学)

时间:2018年10月11日(周四)下午4:00

地点:光电所二层报告厅

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报告题目:基于原子系统的量子存储

报告人:史保森 教授(中国科学技术大学)

时间:2018年8月21日(周二)下午4:30

地点:光电所二层报告厅

摘要: 长距离量子通信和可扩展线性量子计算的实现离不开量子存储器。量子存储器是一个能够按照需要存储和读出量子态的系统。如果量子态的制备或操控通过处于可见或近红外波段的光子实现,则这个量子存储器通常被称为光量子存储器。一个光量子存储器必须能够存储各种非经典态,比如单光子态、纠缠态或压缩态等。评价一个量子存储器性能有存储保真度、存储效率、存储时间、存储带宽及多模存储能力等诸多指标。
       量子存储器的实现离不开存储介质,一个理想的存储介质应该具备较大的光学厚度和较长的消相干时间。冷原子系综中原子密度较大,因而具有较大的光学厚度,且由于原子温度低、运动速度小,由原子之间的碰撞和原子扩散引起的消相干效应弱,因而基于冷原子的量子存储器具有高效率、高保真度、长存储时间等优点,一直是量子存储研究的热点领域。量子存储的实现需要合适的存储方案。目前用于量子存储的方案多种多样,其中基于电磁诱导透明(EIT)和远失谐双光子跃迁方案 (Raman)是两种广泛应用的存储协议。
       量子存储的发展深刻影响着量子信息的发展,人们对于量子存储的要求随着不同的量子信息任务发生了很大的变化。未来的量子存储研究需要考虑到波长可调、频率和空间多模复用的功能,同时还要考虑到非经典光源的不同波长和带宽的兼容性问题,因此构建一个多功能量子存储器是量子信息实用化的一个关键问题。近年来我们小组紧紧围绕多功能量子存储器的实现及相关技术的突破这一核心目标开展了系统的实验研究,取得了系列进展。本报告将介绍我们小组在基于原子气体实现量子存储及相关方面的研究成果,主要内容包括单光子态和qubit态、偏振纠缠和轨道角动量纠缠、二维和高维纠缠的量子存储,以及相关的非经典光场的产生、量子接口的实现等。

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报告题目:Dynamics of dual Bose Fermi superfluids

报告人: Prof. Christophe Salomon(Laboratoire Kastler Brossel, Ecole Normale Supérieure, Paris, France.)

时间:2018年8月20日(周一)下午4:30

地点:光电所二层报告厅

摘要:Using dilute lithium quantum gases where interactions can be tuned, we have produced a Bose-Fermi mixture where both species are superfluid. Such a mixture had long been sought in liquid helium where superfluidity was only achieved separately in bosonic 4He and fermionic 3He. By exciting center of mass oscillations of the mixture we probe the superfluid counterflow which exhibits very small damping below a certain critical velocity. We compare this surprisingly high critical velocity to a recent theoretical prediction. Finally we show that the lifetime of the Bose-Fermi mixture is governed by a very simple formula involving the fermionic two-body contact introduced by S. Tan.

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报告题目:Quantum simulation of Hawking-Unruh radiation

报告人:金政 教授(美国芝加哥大学)

时间:2018年8月17日(周五)下午4:30

地点:光电所二层报告厅

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报告题目:Floquet physics: entering a new exotic quantum world

报告人:金政 教授(美国芝加哥大学)

时间:2018年8月17日(周五)上午10:00

地点:光电所二层报告厅

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报告题目:From in situ imaging at 1 μm to super resolution imaging at 1 nm

报告人:金政 教授(美国芝加哥大学)

时间:2018年8月16日(周四)晚上8:00

地点:光电所二层报告厅

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报告题目:铁电晶体中的畴与畴工程
                Domain and domain engineering in ferroelectric crystals

报告人:祝世宁 中国科学院院士(南京大学)

时间:2018年8月16日(周四)下午5:00

地点:光电所二层报告厅

摘要:Engineering domain in ferroelectric crystals has become a very active field involving many important applications in linear optics, nonlinear optics, laser and quantum optics. At its early stage, the researches were focused on quasi-phase-matched second-harmonic-generation from the periodically poled ferroelectric crystals. The research later was extended to many other nonlinear optical processes, such as optical parametric generation or oscillation, third-harmonic-generation, nonlinear light scattering, nonlinear Cherenkov radiation, nonlinear Talbot effect etc., in which phase matching was fulfilled by either quasi-phase-matching or nonlinear Huggens-Fresnel principle. Nowadays, the study of domain engineering enters a new regime, in which,the goal is to generate and control photons at will. The bright entangled photons have been generated in such crystals by spontaneously parametric downconversion, and been further controlled with full freedom offered by engineered domain, such as focusing, beam-splitting etc. This will bring revolutionary impacts on quantum optics and information in future.

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报告题目:量子卫星的任务和空间光电探测技术

报告人:王建宇 中国科学院院士(中科院上海技术物理研究所)

时间:2018年8月16日(周四)下午3:30

地点:光电所二层报告厅

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报告题目:High-Q micro-disk cavities and their applications

报告人:肖敏 教授 (南京大学,美国阿肯色大学)

时间:2018年7月26日(周四)下午4:00

地点:光电所二层报告厅

摘要:The whispering gallery modes of micro-disk cavities can have very high quality (Q) factors and small mode volumes. Such high-Q micro-disk cavities have been widely used for ultra-sensitive biosensors, low-threshold and narrow linewidth lasers, cavity-QED studies, frequency comb, and cavity opto-mechanics applications.
        When two or more high-Q micro-cavities are coupled together, interesting mode splitting effects occur. With precisely controlled coupling between two micro-disk cavities, EIT (electromagnetically induced transparency)-like phenomenon can be observed and carefully studied. More interestingly, when one of the micro-toroid cavities has a gain that balances the loss in the other micro-cavity, the novel effect of parity-time (PT) symmetry appears in this system. By making use of the gain saturation nonlinearity in the active micro-cavity, nonreciprocal light transmission can be achieved in various micro-cavity systems. Also, with the help of directional nonlinear parametric amplification process in the micro-cavity, true optical isolation can be achieved.
        In this talk, I will present some of our experimental works on demonstrating micro-cavity lasers, coupled micro-disk cavities, parity-time symmetric effects, and optical isolation.

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报告题目:倾斜扫描激光显微镜(Oblique Scanning Laser Microscopy):一种大视场三维多模态成像的新方法

报告人:易季 教授(美国波士顿大学)

时间:2018年7月25日(周三)下午4:00

地点:光电所二层报告厅

摘要:生命科学的进步离不开新的光学成像方法。在一方面有分子成像技术: 比如利用特异的荧光蛋白分子标定或者是利用分子本身的光学特性,共聚焦显微镜可以达到三维亚细胞的分辨率对特定分子的三维空间以及动态成像。此类技术的特异性优点也有自身的缺点:除了特定的分子外,其他的结构是看不到的。在另一方面,一些结构成像的方法,例如光学相干断层成像(optical coherence tomography),可以对所有的结构成像,然而他们却缺乏了分子特异性。因此,多模态的成像方式就显得很重要,可以将分子成像和结构成像结合在一起。在这个方面,大视场三维多模态成像是一个很具挑战的领域。为此,我们实验室开发了一种新的倾斜扫描激光显微镜技术,可以完美的将分子成像和结构成像融合在一起,实现无需深度扫描就可以达到的三维多模态成像功能。在这个报告里,我们会简单的介绍一下这个技术,和我们最新的视网膜三维多模态成像的应用。

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报告题目:A phonon laser operating at the exceptional point

报告人:张靖 教授 (清华大学)

时间:2018.7.18(周三)下午4:00

地点:光电所二层报告厅

摘要:Non-Hermitian physical systems have attracted considerable attention lately for their unconventional behaviour around exceptional points (EPs). In particular, many novel EP-related concepts such as unidirectional lasing and invisibility and chiral transmission have been realized. Given the progress in understanding the physics of EPs in various photonic structures, it is surprising that one of the oldest theoretical predictions associated with them, i.e., a dramatic broadening of the laser linewidth, has remained out of reach of experiments so far. Here, we fill this gap by steering a phonon laser through an EP in a compound optomechanical system formed by two coupled resonators. We observe a pronounced linewidth broadening of the mechanical lasing mode generated in one of the resonators when the system approaches the EP. This is the first time, to our knowledge, that the linewidth broadening of a laser at an EP is explicitly demonstrated.

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报告题目:Environment-Assisted Speed-up Evolution in Cavity Quantum Electrodynamics

报告人:Prof. Luis A. Orozco(JQI, University of Maryland and NIST)

时间:2018.7.5(周四)下午5:00

地点:光电所二层报告厅

摘要:Cavity quantum electrodynamics (CQED) is an open quantum system with dynamics that lends to detailed studies. We measure the quantum velocity of the evolution of the electric field state in a weakly excited CQED system. The system consists of a single mode of an optical cavity and a collection of atoms. Our experiment operates in the intermediate regime of the CQED where the atom dipole-coupling rate to the single mode of the cavity is comparable to the decay rate of the cavity and the atomic spontaneous emission rate.
We consider the mode of the electromagnetic field as the quantum system of interest, with a preferential coupling to a tunable environment: the atoms. By changing the number of atoms coupled to the optical cavity mode, we accelerate the speed to reach the steady state: the quantum speed of the repopulation of state in the optical cavity increases with the coupling between the mode of optical cavity and this non-Markovian reservoir (the number of atoms). We find a non-linear relationship between quantum velocity and the number of atoms in the system.
This talk will introduce the platform and the quantum correlations to characterize it, and then show both the theory and the experiment.

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报告题目:Tradeoffs in Quantum Steering

报告人:程书明 博士(澳大利亚 griffith university)

时间:2018.6.14(周四)下午5:00

地点:光电所二层报告厅

摘要:Quantum steering was introduced by Schrodinger, in response to the famous paradox raised by Einstein, Podolsky, and Rosen (EPR) in 1935. It describes the conditioning effect between two parties, Alice and Bob say, that Bob's system could be remotely prepared into different states by different choices of Alice's measurements when they share a pure bipartite non-product state. In this talk, I will talk about the quantum steering for two-qubit states and beyond qubits. In particular, the following issues are examined: 1) Which states Bob's qubit can be steered to by Alice's qubit (qudit)? 2) What is the connection between this set of steered states and the degree of quantum correlation? 3) Which convex decomposition of Bob's local state can be steered to by Alice's qubit (qudit)? 4) And for a multi-party state, are there restrictions on the degree to which one party can steer the systems of all other parties? I will mainly use the quantum steering ellipsoid to tackle these problems and report monogamy relations of quantum steering ellipsoids for qubits systems and beyond qubits.

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报告题目:Phase Transition of Atomic System in An Optical Lattice

报告人:周小计 教授 (北京大学)

时间:2018年6月9日(周六)上午10:00

地点:光电所二层报告厅

摘要:Atomic many-body phase transitions and quantum criticality have recently attracted much attention in an optical lattice. In this talk, first I report an observation of a dynamical sliding-phase superfluid that emerges in a nonequilibrium setting from the quantum dynamics of a three-dimensional ultracold atomic gas loaded into the P-band of a one-dimensional optical lattice. A shortcut loading method is used to transfer atoms into the P-band at zero quasi-momentum within a very short time duration. The system can be viewed as a series of “pancake”-shaped atomic samples. For this far-out-of-equilibrium system, we find an intermediate time window with lifetime around tens of milliseconds, where the atomic ensemble exhibits robust superfluid phase coherence in the pancake directions, but no coherence in the lattice direction, which implies a dynamical sliding-phase superfluid.
        Second, we perform an experimental study of finite-temperature superfluid transition of bosonic atoms confined in a three dimensional triangular lattice, whose structure can be continuously deformed to dimensional crossover regions including quasi-one and two dimensions. This non-standard lattice system provides a versatile platform to investigate many-body correlated phases. For the three dimensional case, we find that the finite temperature superfluid transition agrees quantitatively with the Gutzwiller mean field theory prediction, whereas tuning towards reduced dimensional cases, both quantum and thermal fluctuation effects are more dramatic, and the experimental measurement for the critical point becomes strongly deviated from the mean field theory. We characterize the fluctuation effects in the whole dimension crossover process. These experiments potentially open up a novel venue to search for quantum criticality and exotic dynamical phases in the high-band excitations in optical lattices.

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报告题目:Photon detection with superconducting detectors from millimeter-wave to gamma-ray

报告人:高湔松 研究员(美国NIST研究所)

时间:2018年6月8日(周五)上午10:30

地点:光电所二层报告厅

摘要:Operating at a temperature less than 1 Kevlin above absolute zero, superconducting detectors provide ultimate sensitivity for photon detection and cover an ultra-wide wavelength range, from millimeter-wave, IR/visible/UV, to x-ray and gamma-ray. They are used in the most demanding applications such as the detection of cosmic-ray background (CMB) signal and single infrared photons. The principle and recent progress of several important superconducting detector technologies will be presented. Examples of their applications in quantum information processing and astrophysics will be discussed.

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报告题目:量子磁强计高空间分辨率测量的探索与思考

报告人:董海峰 副教授(北京航空航天大学)

时间:2018.6.4(周一)下午5:00

地点:光电所二层报告厅

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报告题目:Dressing ultra-cold atoms for control and quantum technology

报告人:Prof. Barry Garraway(Department of Physics and Astronomy, University of Sussex, Falmer, Brighton, BN1 9QH, United Kingdom)

时间:2018.6.2(周六)上午10:00

地点:光电所二层报告厅

摘要:Dressing atoms with radio-frequency and microwave radiation opens up new possibilities for ultra-cold atoms and a BEC in new types of trap and in new topologies involving waveguides. This is because of the flexibility inherent in the vector coupling of a magnetic dipole moment to electromagnetic fields which can be varied in time, frequency, orientation and space. This may in turn result in quantum technology applications to sensing (with ring traps and gyroscopes), metrology, interferometry and atomtronics.
In this talk we will introduce the concept of the dressed atom, and present several designs for matter-wave ring traps, as well as rf-dressed lattices for ultra-cold atoms and a description of Landau-Zener losses from these traps.

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报告题目:钌氧化物Sr4Ru3O10中奇异磁特性的起源

报告人:杨继勇 副研究员(中国科学院强磁场科学中心)

时间:2018.5.10(周四)下午5:00

地点:光电所二层报告厅

摘要:4d钙钛矿关联电子体系Srn+1RunO3n+1 (n=1, 2,∞)中存在多种自由度,包括电荷、自旋、晶格以及轨道间的复杂相互作用,蕴含着丰富的物理现象,如p波超导电性(Sr2RuO4)和量子临界(Sr3Ru2O7)等。n=3的Sr4Ru3O10是一种具有奇异磁性质的材料。该材料在TC~105 K发生铁磁转变,随后在TM~50 K发生第二个磁转变。在TM以下,其磁性质具有很强的各项异性,当磁场沿c方向时,表现出典型的铁磁行为,而当磁场沿ab面时,却表现出类似于反铁磁的行为并存在磁场诱导的变磁转变。以前,对该材料所具有的这种奇异磁特性的机理一直缺乏很好的理解。近年来,我们通过机械解离的办法首次将Sr4Ru3O10单晶的厚度推进到纳米尺度,并通过输运测量系统的研究了不同厚度Sr4Ru3O10纳米薄片的磁特性。我们发现,Sr4Ru3O10中的第二个磁转变实际上是一种自旋重取向行为,与该材料中的自旋晶格耦合密切相关。

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报告题目:Electronic Phase Control with an Electric Field

报告人:袁洪涛 教授(南京大学现代工程与应用科学学院)

时间:2018.5.4(周五)下午5:00

地点:光电所二层报告厅

摘要:Electric-field control of charge carrier density has attracted much attention since it is remarkably simple for modulating physical properties of condensed matters and for exploring new functionalities with a transistor configuration. To realize novel field-effect modulated electronic phenomena in solids, a broad range of attainable carrier density is always required. However, so far, owing to the limitation of dielectric breakdown in most solid dielectrics, the maximum carrier density accumulated in conventional field-effect transistors (FETs) is quite low (<< 1013 cm-2) and thus seriously limits the tunability of electronic states of solids, for example, not sufficient enough to induce insulator-to-superconductor transition. While, recently a new type of transistor, known as electric-double-layer transistor (EDLT), with ionic liquids (ILs) as gate dielectrics have been proved to be able to effectively attain a high carrier density up to levels of around 1015 cm-2 and to realize a large local electric field up to 50mV/cm at liquid/solid interfaces, which are attracting increasing interests because of their potential to greatly tune electronic states and even to create novel states of matter which are impossible or difficult to obtain in conventional methods. In this presentation, I will discuss the interfacial carrier accumulation within liquid gated EDLTs and their novel tunability of varied electronic phase transitions in oxides, chacogenides and Dirac materials like graphene and topological insulators.

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报告题目:Two-dimensional artificial nano-hybrids and their quantum properties

报告人:韩拯 教授(中科院金属研究所)

时间:2018.4.20(周五)下午5:00

地点:光电所二层报告厅

摘要:When different materials are interfaced/jointed with each other, the resulted hybrid systems often manifest fascinating physical properties that do not exist in nature. Among the many artificial hybrids (sometimes addressed as meta-materials or hetero-structures), nano-hybrid made with low-dimensional materials and other functional materials is attracting tremendous attentions in recent years.
        In this talk, we will mainly go through a couple of examples of our studies on the graphene/superconducting-islands, and the 2D materials/h-Boron-Nitride nano-hybrid systems. In the former, the superconducting behavior is successfully coupled to the gate-tunable feature of graphene, leading to a metal-superconducting quantum phase transition at the ground state.[1] While in the later, ultra-flat and ultra-clean interface allow ballistic electronic transport, opening new path to realize the paradigm of electron optics.[2] Our recent experimental progresses on MoS2/h-BN hetero-structures will also be discussed.[3] We expect that artificial nano-hybrids and their quantum properties can be expanded into many research areas that are important for both fundamental studies and future applications.

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报告题目:Pure Gaussian states in open quantum systems

报告人:马山 讲师(中南大学信息学院)

时间:2018.4.19(周四)下午5:00

地点:光电所二层报告厅

摘要:Pure Gaussian states serve as key resources for continuous-variable quantum information processing. Therefore, preparation of pure Gaussian states is an important task. One powerful approach is based on reservoir engineering. That is, we engineer an open quantum system by designing its coherent and dissipative processes such that the system is strictly stable and evolves into a target pure Gaussian state. In this talk, I will review recent results on the preparation of pure Gaussian states via reservoir engineering and some specific applications will also be discussed.

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报告题目:Dynamical classification of topological quantum phases

报告人:刘雄军 教授 (北京大学,量子材料中心)

时间:2018.4.9(周一)下午5:00

地点:光电所二层报告厅

摘要:Topological phase of matter is now a mainstream of research in condensed matter physics, of which the classification, synthesis, and detection of topological states have brought many excitements over the recent decade while remain incomplete with ongoing challenges in both theory and experiment. In this talk I present a universal dynamical characterization of the topological quantum phases classified by integers, which was proposed very recently in our work. The framework of the present study consists of basic theorems. First, we uncover that classifying a generic d-dimensional (dD) gapped topological phase can reduce to a (d-1)D invariant defined on so-called band inversion surfaces (BISs), rendering a fundamental bulk-surface duality. Further, we show in quenching across phase boundary the (pseudo)spin dynamics to exhibit unique topological patterns on BISs, which are attributed to the post-quench bulk topology and manifest a dynamical bulk-surface correspondence. The topological phase is then classified by a dynamical topological invariant measured from dynamical spin-texture field on the BISs. Applications to quenching experiments on feasible models are proposed and studied. The future interesting issues will be discussed.

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报告题目:纳米材料与器件的研发挑战及其技术变革

报告人:丁孙安 研究员(中科院苏州纳米所)

时间:2018.4.3(周二)下午4:00

地点:光电所二层报告厅

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报告题目:原子芯片上的超冷原子操控

报告人:李晓林 副研究员(中科院上海光机所,中科院量子光学重点实验室)

时间:2018.1.25(周四)下午4:00

地点:光电所二层报告厅

摘要: 原子芯片将原子光学元器件集成到一块半导体芯片上,可完成超冷原子的制备、探测和操纵,它把量子光学、物质波光学理论和微制造技术联系在一起,可简化实验装置,提供更紧的束缚和更小的磁阱尺寸,实现对被囚禁原子团进行复杂且精确的操纵,例如导引型陀螺仪、冷原子与表面相互作用、精密磁场成像、基于自复相的长相干时间获得等。我们在原子芯片上实现了铷原子BEC,并开展了导引、分束和系统小型化等方面的研究工作。利用原子芯片产生的准一维势阱,计划开展里德堡缀饰和自旋压缩方面的研究。

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报告题目:基于原子系综的多自由度存储与多体相变

报告人:丁冬生 博士、教授(中国科技大学,中科院量子信息重点实验室)

时间:2018年1月16日(星期二)下午5:00

地点:光电所二层报告厅

摘要: 利用光和冷原子系综相互作用,实现单光子和存储单元之间的混合纠缠以及存储单元之间的混合纠缠,对于构建混合自由度的量子网络具有重要意义。本报告中,主要讲解如何实现光子轨道角动量、偏振、路径等单个自由度纠缠的存储,以及多个自由度的混合纠缠,以及超纠缠的量子存储。实验结果证明,基于冷原子系综的量子存储器可以存储光子多个自由度,并高保真地保持量子特性。此外,还将介绍基于Rydberg原子的多体相变相关方面的研究进展。传统方法主要基于Rydberg原子的布居数来调控相变,报告人将介绍基于Rydberg原子的电磁诱导透明效应实现比传统方法更高精度的相变。实验中可以观测到一阶相变、二阶相变以及光学双稳现象、双稳操控等。

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报告题目:保护性测量与量子实在

报告人:高山 教授(山西大学科学技术哲学研究中心)

时间:2018年1月6日(周六)上午10:00

地点:光电所二层报告厅

摘要: 保护性测量(Protective Measurements)的理论蕴含和实验实现是近年来量子力学基础研究中的一个热点。本报告将介绍保护性测量的概念的起源,基本原理,以及围绕它的关于波函数实在性的争论。此外,还将介绍报告人关于保护性测量意义的最新研究进展,尤其是检验波函数实在性的新的实验建议。

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报告题目:魔幻光强偶极阱与量子信息处理

报告人:何晓东 博士、副研究员(中国科学院武汉物理与数学研究所)

时间:2018年1月4日(周四)下午5:20

地点:光电所二层报告厅

摘要: 可控的中性原子阵列是用于实现量子计算机和量子模拟器的众多候选体系之一。相比于其他体系,中性原子阵列的优势在于其可扩展性,而单比特的独立控制与读出是它的劣势之一。最近,两个不同的研究组在2D和3D原子阵列中演示了保真度高于99%的单个原子比特的寻址操作,但保真度与容错量子计算阈值(99.99%)还有一定距离。为了达到并突破该阈值,我们利用最近发展的魔幻光强技术有效抑制单量子比特的退相干作用,实现了保真度高于99.99%的微波驱动的单量子比特逻辑门,这一研究结果为实现可扩展中性原子容错量子计算机打下了坚实的基础。

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报告题目:基于里德堡阻塞的异核双原子纠缠

报告人:许鹏 博士、副研究员 (中国科学院武汉物理与数学研究所)

时间:2018年1月4日(周四)下午4:20

地点:光电所二层报告厅

摘要: 操控不同粒子间的纠缠对于模拟和理解强关联的多体相互作用体系等有重要意义。我们在异核单原子囚禁的基础上,利用480nm和780nm激光将铷原子相干激发到主量子数n=79的里德堡态;利用铷-85和铷-87在光谱频率上的差别,在原子间距为3.8微米时依然实现了对单个原子的寻址及完备操控。相比同种原子体系,我们实现了更为优越的串扰抑制,更强的里德堡态原子间的偶极-偶极相互作用和更高效的里德堡阻塞。在此基础上我们首次实现了异核原子间的量子受控非门和量子纠缠,不仅展示了异核体系在寻址和抑制原子间操作串扰方面的优势,从而推进多组份原子的量子计算方案,而且为基于异核里德堡原子体系模拟复杂自旋相互作用模型铺平了道路。

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报告题目:Non-equilibrium dynamics of ultracold Bose gases in optical lattices using a scanning electron microscope

报告人:Dr. Jian Jiang (TU Kaiserslautern)

时间: 2017年12月23日(周六)上午10:00

地点:光电所二层报告厅

摘要: In this talk, I will first introduce our experimental platform, a scanning electron microscope for ultracold quantum gas, followed by a discussion of an experiment in which we characterize the emerging steady-states of a driven-dissipative Josephson junction array, realized with a BEC in a onedimensional optical lattice. In this experiment, by locally applying dissipation using the electron beam at an initially full site, the superfluid response of the respective site breaks down. This can be seen as an extension of the paradigm of Coherent Perfect Absorption (CPA). In its original occurrence CPA refers to the complete extinction of bidirectional incoming radiation by spatially localized absorber embedded in a waveguiding medium.

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报告题目:Strong atom-light interaction in nanophotonic structures

报告人:栾兴生博士 (美国加州理工学院)

时间: 2017年12月20日(周三)下午5:00

地点:光电所二层报告厅

摘要: In this talk, I will briefly review the physics and recent advances towards strong atom-light interaction in nanophotonic structures. In the first half, I will present some recent results on trapping atoms near a photonic crystal waveguide in Professor Jeff Kimble's group. By studying the loading process into a nanophotonic trap, we are now able to load >3 times more atoms into the side-illumination trap above the nanophotonic waveguide compared with previous published results. In the second half, I will present our recent efforts towards trapping an array of atoms deterministically, by integrating with optical tweezers integrating optical tweezers with nanophotonic waveguide system. We show that our system is a promising toolbox to study exotic quantum many body physics.

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报告题目:高效量子精密测量

报告人:项国勇 教授 (中国科学技术大学)

时间: 2017年12月4日(周一)下午5:00

地点:光电所二层报告厅

摘要: 量子精密测量是伴随着量子信息技术的发展而发展起来的一个重要的研究领域。我们主要介绍如何实现超越经典标准量子极限的参数估计,包括量子相位估计,量子多参数估计,量子态的估计以及量子反馈控制在提高估计精度中的应用。

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报告题目:利用原子纠缠超越测量精度的经典极限

报告人:尤力 教授(清华大学)

时间: 2017年11月30日 (周四)下午5:00

地点:光电所二层报告厅

摘要: 关于测量的科学对人类至关重要。测量的精度决定了我们对自然的认知程度和相关自然规律的准确度。现行的精密测量通常基于单个物理系统或者它的多份拷贝,其测量精度受限于经典极限。建立多个相同体系之间的量子纠缠可以超越测量精度的经典极限。本报告将介绍一些基于原子物理系统的相关研究工作。

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报告题目:Reflecting on an alternative (parity-time-symmetric) quantum theory and its analog in optics

报告人:Prof.Ray-Kuang Lee高效量子精密测量(Institute of Photonics Technologies, National Tsing-Hua University,Taiwan)

时间: 2017年11月14日(星期二)下午5:00

地点:光电所二层报告厅

摘要: By no-signaling principle, we showed that parity-time (PT)- symmetric quantum theory as an extension of the quantum theory to non-Hermitian Hamiltonians is either a trivial extension or likely false as a fundamental theory. In addition to the implementation PT-symmetric optical systems by carefully and actively controlling the gain and loss, we show that a 2 × 2 PT-symmetric Hamiltonian has a unitarily equivalent representation without complex optical potentials in the resulting optical coupler. Through the Naimark dilation in operator algebra, passive PT-symmetric couplers can thus be implemented with a refractive index of real values and asymmetric coupling coefficients. Moreover, with a phase-space representation on the vicinity of an exceptional point, we show that a PT-symmetric phase transition from an unbroken PT-symmetry phase to a broken one is a second-order phase transition.

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报告题目:腔光力学与宏观机械振子的基态冷却及耦合调控

报告人:刘永椿 助理教授(清华大学)

时间: 2017年10月27日(星期五)下午5:00

地点:光电所二层报告厅

摘要: 光学微腔与机械振子的耦合所形成的腔光力系统可以为宏观机械振子的量子操控提供技术手段,从而将量子物理的研究拓展到宏观尺度。这使得人们能够定量地研究量子-经典边界,以及为量子精密测量和量子信息处理提供新的工具。本报告将介绍报告人在机械振子的基态冷却以及腔光力耦合调控方面的工作。首先,将机械振子冷却到量子基态是对其进行量子操控的先决条件,我们用非微扰方法建立了腔光力冷却动力学过程的统一理论框架,提出动态耗散冷却方案,显著降低强耦合区的冷却极限;提出耦合腔冷却方案,突破边带可分辨条件的限制。另外,腔光力系统中的强耦合是量子相干操控的必要条件,同时也是实验实现的难点,我们提出了频率匹配共振增强和复合微腔方案实现对耦合的有效调控,为耦合增强提供了新的实现手段。

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报告题目:混沌光通信应用研究

报告人:义理林 教授(上海交通大学)

时间: 9月23日 上午10:00

地点:光电所二层报告厅

摘要:混沌光通信经过二十多年的研究,取得了长足的进展,目前已经实现10Gb/s信号传输100公里的城域网现网演示。但混沌光通信的进一步发展受到很多现实的制约。本报告主要介绍混沌光通信走向应用的技术障碍,以及解决这些障碍的技术途径。

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报告题目: Listening to space time vibrations

报告人:Prof. Jerome Degallaix(Laboratoire des Matériaux Avancés (LMA) CNRS– Lyon, France.)

时间: 2017.7.21   下午5:00

地点:光电所二层报告厅

摘要:The recent announcements of the discovery of gravitational waves from the coalescence of two binary black holes has opened a new window to study the universe. The measurement of those extremely small perturbations of space time has only been possible thanks to the technological progress happening in the last two decades.In this presentation, we will come back to the astrophysical discoveries but the focus will be on the detector itself, a giant Michelson interferometer with state of the art large optics. Finally at the end of the talk, we will discuss the future projects in the field.

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报告题目: Quantum information with neutral atoms and Rydberg interactions

报告人:M. Saffman (University of Wisconsin-Madison)

时间:2017年7月15日 上午10点

地点:光电所二层报告厅

摘要:Rydberg interactions are now in use in many research groups for quantum information processing. I will present experiments showing the creation of entangled |W> states of ~10 atoms, and two-atom Bell states. While these experiments form a basis for future developments, scalable quantum computing will require improvement of many aspects of these experiments. I will address recent ideas and progress in several directions including doubly magic trapping for long coherence qubits,higher gate fidelity with shaped analytic pulses, and measurement free error correction, which leverages the potential of Rydberg interactions for efficient multi-qubit gates.

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报告题目: Magnetic solitons in a binary Bose-Einstein condensate

报告人:Chunlei Qu (BEC Center, University of Trento, Italy)

时间:2017.6.5(周一)上午11:00

地点:光电所二层报告厅

摘要:Since the first experimental realization of Bose-Einstein condensation (BEC) in 1995, many intriguing physics have been observed with ultracold atomic gases. For instance, solitons, the fascinating topological excitations of nonlinear systems that can move in their medium without losing their shape, have been engineered in BEC. I will talk about our recent results on the investigation of a new type of soliton, magnetic soliton, in a binary BEC. In the absence and in the presence of a coherent coupling between the two components, the magnetic soliton solutions exhibit interesting distinct features . I will also briefly discuss our recent experimental observation of the spin-dipole oscillation and polarizability of a binary condensate .

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报告题目: Microcavity Nonlinear Photonics

报告人:邹长铃 副研究员(中国科学技术大学)

时间:2017.5.25(周四)下午5:00

地点:光电所二层报告厅

摘要:The optical microcavities provide an excellent platform for strong light-matter interactions, due to their ultrahigh quality factor and small mode volume. The microcavities have been used for high sensitive sensing, low threshold lasing as well as single photon quantum gates by interacting with single emitters. Here, we explore the nonlinear optical processes in microcavities. By carefully engineering the geometry of microcavities, we demonstrated the coherent frequency conversion, narrow linewidth photon pair source, high efficient second harmonic generation, third harmonic generation, as well as frequency comb. These integrated nonlinear photonic devices, which are robust, compact and scalable, hold the great potential for future applications.

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报告题目: Optimal experimental test of macroscopic realism

报告人:薛鹏 教授 (东南大学)

时间:5月13日(周六)上午10:00

地点:光电所二层报告厅

摘要:Macrorealism, as defined by Leggett and Garg, posits that a macroscopic system always exists in a well-defined state and that it can be measured without disturbing it. From these assumptions follow a set of inequalities, the Leggett-Garg inequalities, which hold under macrorealism but can be violated by quantum mechanics. The degree to which quantum systems can violate these inequalities is bounded and, in particular, if the measurements on the system are genuinely dichotomic, the bound for these temporal inequalities is the same as the Tsirelson bound of the corresponding spatial Bell inequality. We realise a photonic Leggett-Garg test on a three-level system and implement measurements that admit three distinct measurement outcomes, rather than the usual two. In this way we obtain violations of a Leggett-Garg inequality significantly in excess of the Tsirelson bound. This underlines the difference between Bell and Leggett-Garg inequalities and hence spatial and temporal correlations in quantum mechanics. We also report violations of a second consequence of macrorealism, the quantum-witness equality, up to the maximum permitted for a three-outcome measurement.

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报告题目: From Superradiance Lattice to Topological Quantum Optics

报告人:Dawei Wang Department of Physics and Astronomy, Texas A&M University

时间:2017年5月11日 下午5:00

地点:光电所二层报告厅

摘要:Superradiance has grown into a major topic in quantum optics since Dicke’s seminal paper in 1954. Recently, timed Dicke states, the collective excitations of extended atomic ensembles by single photon absorption, have been found with interesting properties such as directional emissions and collective Lamb shifts. By combining the timed Dicke states with the electromagenetically induced transparency, we can construct a momentum-space tight-binding lattice, coined the superradiance lattice [1], which has been recently realized in BEC by Jing Zhang's group from Shanxi University. In this talk, I will introduce the basic concept of the superradiance lattice and its applications in quantum metrology [2] and optical diodes [3]. In particular, the Haldane model can be simulated in two dimensional superradiance lattices [4]. The same physics can be extended to a cavity QED system, simply a two-level system coupled with three cavities, where the chiral edge currents in a Fock-state lattices enables the preparation of Schrodinger cat states [5]. This study shows that the physics of topological insulators can be demonstrated in quantum optics systems and have important applications.

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报告题目:Development of high power femtosecond laser source and various kinds of UV and VUV laser generation

报告人:赵智刚 博士(东京大学 物性研究所)

时间:2017年4月5日 下午5:00

地点:光电所二层报告厅

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报告题目:单频光纤激光技术与器件

报告人:徐善辉 教授(华南理工大学 发光材料国家重点实验室)

时间:2017年4月5日 下午4:20

地点:光电所二层报告厅

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报告题目:Quantum simulation based on trapped ions

报告人:申恒 博士(奥地利科学院量子光学与量子信息研究所)

时间:2017年3月31日 下午4:30

地点:光电所二层报告厅

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报告题目:亚散粒噪声极限偏振仪的研制

报告人:冯胜 教授(湖北工业大学)

时间:2017年1月3日 下午5:00

地点:光电所二层报告厅

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报告题目:半导体n-GaAs及碱金属铷原子中的自旋噪声谱研究———“倾听”自旋的噪音,探索材料的奥秘

报告人:马健 博士(中国科学院半导体研究所)

时间:2016年12月23日 下午5:00

地点:光电所二层报告厅

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报告题目:Coherent Interaction between Single-Photon and Cold Atoms

报告人:张善超 博士(香港科技大学)

时间:2016年11月29日 上午10:30

地点:光电所二层报告厅

摘要:

        Manipulate photon-atom interaction on quantum level lies at the heart of modern quantum physics and quantum information science. In this talk I may briefly introduce series of my work related with single photons and mainly discussed the work of single photon storage in cold atomic ensemble. Firstly, a dark-line 2-dimensional magneto-optical trap and long coherence time (~1us) heralded single photons source will be presented. Followingly, improve optical quantum memory in dense cold atomic ensemble will be discussed mainly. In this work, benefit from the high optical depth of the atomic ensemble and the high controllabity of single photon waveform, we still kept the highest single-photon storage efficiency around 50%. I also will briely present my works including exploring the information speed limit of a single photon utilizing optical precursor phenomena, direct observation of photon absorption and reemission timing order and improved DPS-QKD protocal. Finally,I will share very shortly my current project in the ultracold degenerated Yb atomic gases.

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报告题目:硅芯片上微光学腔系统中控制:理论与实验进展

报告人:张靖 副教授(清华大学)

时间:2016.11.24 下午5:00-6:00

地点:光电所二层报告厅

摘要:

        硅芯片上微光学腔系统是目前微纳光子学领域研究的热点,围绕这一系统发现了很多新奇的物理现象,如光机械运动,声子激光,混沌等。报告将主要针对这一系统,介绍我们近期在理论与实验上取得的进展。主要包括两方面工作:(1)结合我们之前的工作提出的反馈非线性化的方法,近期我们发现,采用这一思想,可以在光机械系统中,打破系统的时空反演对称性(PT对称性),从而产生超低阈值的声子激光,并可用于传感,声子调控等,相关成果发表于物理顶级期刊Physical Review Letters等期刊;(2)结合我们之前提出的混沌扩频通信的方案,我们在近期的实验中实现了一种新的微纳光子学领域的弱光扩频方案。实验研究表明,利用光机械效应,可以实现混沌这一典型的强非线性效应从强光向弱光的传输,并在实验上首次观测到了光机械系统中的随机共振现象,这部分工作长文(Article)发表于Nature子刊Nature Photonics,并被Nature Photonics选为2016年6月刊的封面论文。

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报告题目:超导量子相干器件和量子计算

报告人:刘玉玺 教授(清华大学)

时间:2016.11.24 下午4:00-5:00

地点:光电所二层报告厅

摘要:

        经过近20年的发展,超导量子相干电路和超导量子计算取得了令人瞩目的跨越式发展。新设计的原型器件和相关的新物理现象接连涌现。量子比特相干时间从最初的纳秒级提升到百微秒级,寿命达到毫秒级。超导量子电路已达到了量子计算纠错的阈值条件并具有了容错功能。这些成就吸引了国际商业和政府机构的极大关注,比如谷歌,IBM,Intel等国际著名的公司开始设计和制造基于超导材料的量子信息处理器。本报告将基于超导量子电路过去的发展,结合个人的某些理论研究,对未来大规模超导量子信息处理在器件原理,量子仿真与纠错,信息的存储与操控,拓扑计算,量子程序运行等方面可能面临的一些理论问题做一梳理和探讨,以期进一步推动有关方面的理论研究。

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报告题目:光学微腔在高灵敏磁场检测中的应用

报告人:李贝贝 博士(北京大学物理学院)

时间:2016.11.19(周六)上午10:00

地点:光电所二层报告厅

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报告题目:Gravitational-Wave Detection Beyond the Standard Quantum Limit via EPR Entanglement

报告人:马怡秋博士 (美国加州理工学院)

时间:2016.11.3(周四)下午4:30

地点:光电所二层报告厅

Abstract:
          The Standard Quantum Limit in continuous monitoring of a system is given by the trade-off of shot noise and back-action noise. In gravitational-wave detectors, such as Advanced LIGO, both contributions can simultaneously be squeezed in a broad frequency band by injecting a spectrum of squeezed vacuum states with a frequency-dependent squeeze angle. This approach requires setting up an additional long base-line, low-loss filter cavity in a vacuum system at the detector's site. Here, we show that the need for such a filter cavity can be eliminated, by exploiting EPR-entangled signal and idler beams. By harnessing their mutual quantum correlations and the difference in the way each beam propagates in the interferometer, we can engineer the input signal beam to have the appropriate frequency dependent conditional squeezing once the out-going idler beam is detected. Our proposal is appropriate for all future gravitational-wave detectors for achieving sensitivities beyond the Standard Quantum Limit.

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报告题目:Time and frequency standard: Atomic Clock

报告人:Prof. Manzoor Ikram (National Institute of Laser and Optronics,Nilore, Islamabad,Pakistan)

时间:2016.10.19(周三)下午5:00

地点:光电所二层报告厅

Abstract:
          Cesium atomic beam clocks have been the workhorse for many demanding applications in science and technology for the past five decades. Tests of the fundamental laws of physics and the search for minute changes in fundamental constants, the synchronization of telecommunication networks, and realization of the satellite-based global positioning system would not be possible without atomic clocks. The adoption of optical cooling and trapping techniques, has produced a major advance in atomic clock precision. Cold-atom fountain and compact cold-atom clocks have also been developed. Measurement precision of a few parts in 1015 has been demonstrated for a cold-atom fountain clock. We present here an overview of the Pakistan's time and frequency metrology program based on cesium atoms. This activity consists of construction and characterization of atomic-beam, and several variations of cold-atom clocks. We discuss the basic working principles, construction, and evaluation. We also present here the research work towards compact atomic clocks based on atomic coherence effects.

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报告题目:窄带非简并纠缠光源的制备

报告人:王健 博士 (中国科学技术大学)

时间:2016.10.15(周六)上午11:00

地点:光电所二层报告厅

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报告题目:基于离子阱的量子模拟与量子计算

报告人:崔金明 博士 (中国科学技术大学)

时间:2016.10.15(周六)上午10:00

地点:光电所二层报告厅

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报告题目:固体量子存储

报告人:李传锋 教授 (中国科学技术大学)

时间:2016.10.15(周六)上午9:00

地点:光电所二层报告厅

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报告题目:Studying strongly correlated quantum physics based on ultracold strontium atoms

报告人:张熙博 副教授(北京大学量子材料科学中心)

时间:2016.9.21(周三)下午5:00

地点:光电所二层报告厅

摘要:

        Since the creation of Bose-Einstein condensates, ultracold atoms have been driving the quantum simulation of manybody physics. However, the power of cold-atom experiments will be enhanced even further by precision measurements, allowing interaction physics and manybody physics normally probed at nK temperatures to be studied at μK temperatures. This is precisely what was recently achieved using cold strontium atoms. On the basis of ultrastable lasers with 1×10-16 instability, the JILA strontium (Sr) optical clock realized a powerful laboratory to study a spin system with manybody dynamics. Here, s- and p-wave inter-atomic interactions are characterized to high precision, enabling a spectroscopic observation of SU(N £ 10) symmetry in 87Sr and beyond-mean-field correlations at μK temperatures. This study reveals a new route for pushing the frontier of emergent many-body physics.
        Going beyond experimental limitations requires combining extraordinary measurement precision with state-of-the-art techniques to cool, probe, and engineer quantum gases. High-spatial-resolution imaging is one such technique. It reveals equations of state and dynamics of a quantum gas, and allows engineering arbitrary trapping potentials for studying transport phenomena. I will discuss how degenerate Sr gases provide unique opportunities to explore strongly correlated quantum physics such as the fractional quantum Hall effect.

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报告题目:Unveiling Microscopic Structure at Interface With Better Surface Resolution

报告人:田传山 教授(复旦大学)

时间:2016.9.20(周二)下午5:00

地点:光电所二层报告厅

摘要:

        Surface and interface under non-vacuum environment are extremely important in nature and modern technology, for instance, friction, corrosion, surface catalysis and electrochemistry. Among very few available techniques that can probe such surface/interface, Sum frequency spectroscopy (SFS) has the advantages of being highly surface-specific with sub-monolayer sensitivity. Surface resolution of SFS is dictated by symmetry under electric dipole approximation. However, there still exist challenges for the current SF spectroscopy, which hinders advances of the field. In this talk, I will discuss on the following two problems: (1) Beyond the electric dipole approximation, the higher-order electric-quadrupole bulk contribution to surface SF generation may not be negligible. The problem has been the lingering doubt for decades, and is particularly important in dealing with media that do not have a strongly polar-oriented surface layer; (2) The second challenge is how to probe molecular structure of the first few monolayers at charged interface, e.g. charged water interface. Such atomically-thin layer governs the properties and functionality of the interface, including electron and energy transfer through interface in solar cell.

 

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报告题目:dark soliton in polariton BEC

报告人:薛艳 博士(吉林大学)

时间:2016年7月14日(周四)下午5:30

地点:光电所二层报告厅

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报告题目:Cross-Phase Modulation Based on Polarization-Sensitive Rydberg Blockade

报告人:吴金辉 教授(东北师范大学量子科学中心)

时间:2016年7月14日(周四)下午4:30

地点:光电所二层报告厅

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报告题目:Cold atoms and hot quark-gluon plasma

报告人:王福强 教授(湖州师范学院理学院)

时间:2016年7月13日(周三)下午5:00

地点:光电所二层报告厅

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报告题目:Hybrid reduced-noise amplification and its applications

报告人:赵洁 博士(澳大利亚国立大学)

时间:2016年7月13日(周三)上午11:00

地点:光电所二层报告厅

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报告题目:Quantum computing and precision measurement in cold atom traps

报告人:夏添 博士(中国科学技术大学)

时间:2016.7.7(周四)下午5:00

地点:光电所二层报告厅

摘要:
Part I: In University of Wisconsin-Madison, we have developed a 2D array of optically trapped single atom qubits for quantum computation experiments. We characterize single qubit Clifford gate operations with randomized benchmarking achieving global and site selected gates with fidelities close to fault tolerance thresholds for quantum computation. A two-qubit Rydberg blockade interaction provides a CNOT gate which is used to create entangled Bell pairs. The fidelity is characterized with parity oscillation measurements.
Part II: A permanent electric dipole moment (EDM) of an atom signifies the violation of both parity (P) and time-reversal (T) symmetries. Measurements of atomic EDM open a promising avenue towards new physics beyond the Standard Model. 225Ra is an ideal case due to a strong nuclear octupole deformation, making its atomic EDM more sensitive to T-violating effects. 225Ra is radioactive with a half-life of 15 days. 171Yb is a stable isotope with atomic properties and transitions similar to those of 225Ra. It is particularly useful as a proxy for testing various measurement schemes and investigating systematic errors. We propose to construct a cold Yb trap system for EDM measurement.

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报告题目:Optomechanical devices for improving the sensitivity of gravitational wave detectors

报告人:赵春农 教授(University of Western Australia)

时间:2016年6月28日(周二)下午5:00

地点:光电所二层报告厅 

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报告题目:The role of Discord in Quantum Illumination

报告人:Jayne Elizabeth Donovan Thompson(National University of Singapore)

时间:2016年5月31日(周二)下午5:30

地点:光电所二层报告厅

摘要:Abstract:Quantum illumination, is a protocol which uses an entangled probe to detect the presence (x= 0) or absence (x=1), of a faint reflecting object which is bathed in intense noise. Remarkably while the noise injected into this system effectively kills all entanglement before the probe even interacts with the reflecting object, this precursory entanglement still helps us determine the value of x. This is considered highly paradoxical. How can the benefits of entanglement out-survive entanglement breaking noise?
          In this talk I will show that this paradox is resolved by a highly noise resilient type of quantum correlations known as quantum discord -- i.e. quantum illumination works, precisely because even after all entanglement in the initial probe state is destroyed, discorded correlations survive. Indeed I will show that there is a quantitative relation between the amount of discorded correlations, used to store the value of x, and the performance gap between quantum illumination and the best classical illumination protocols. In doing so we effectively kill two 'proverbial' birds with one stone. On the one hand we demonstrate the role of discord as a resource, in a prominent quantum protocol. On the other we demystify quantum illumination, providing a new way to understand and interpret this protocol.
 

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报告题目:Replicating the benefits of closed time-like curves without Breaking Causality

报告人:Mile Gu(新加坡南洋理工大学)

时间:2016年5月31日(周二)下午4:30

地点:光电所二层报告厅

 

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报告题目:Photonic Maxwell's Demon

报告人:Prof. Vlatko Vedral(英国牛津大学)

时间:2016年5月31日(周二)下午3:30

地点:光电所二层报告厅

摘要:Abstract:In my lecture I will explain the basis behind the relationship between thermodynamics and (quantum) information theory. I will show how our information about the system we are manipulating allows us to extract work from it. I will then discuss some basic results relating information to thermodynamical work and illustrate this using the concept of Maxwell's demon. Finally, I will present a quantum optical experiment where a simple photon subtraction process is used to gain information about the state of light which is then fed forward to extract electrostatic work from a capacitor. Understanding whether quantum physics offers any thermodynamical advantages presents one of the main open questions in this exciting field.

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报告题目:About states and modes in quantum optics
报告人:Prof. Claude Fabre(法国巴黎第六大学特级教授)

时间:2016年5月30日(周 一)下午4:00
地点:光电所二层报告厅

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报告题目:Spin-orbit coupling for ultracold atomic gases

报告人:Prof. Gediminas Juzeliūnas (Institute of Theoretical Physics and Astronomy, Vilnius University, Lithuania)

时间:2016年5月10日(周二)下午5:00

地点:光电所二层报告厅

摘要:In the initial part of the talk a background material will be presented on the spin-orbit coupling (SOC) for electrons and ultracold atoms. At present there is a great deal of interest in the SOC affecting the centre of mass motion of ultracold atoms. Subsequently we shall discuss some recent developments in the area. One of current challenges is to experimentally produce a two-dimensional (2D) SOC of the Rashba type. We shall discuss a novel way of creating the 2D SOC using a bilayer atomic Bose-Einstein condensate (BEC). It is shown that an interplay between the inter-layer tunneling, intra-layer Raman coupling, and intra-layer atom-atom interaction gives rise to diverse ground-state configurations for such a bilayer BEC. We shall also discuss some other recent work in the area, including the magnetically generated spin-orbit coupling.

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报告题目:The utility of quantum technologies

报告人:张利剑 教授(南京大学现代工程与应用科学学院)

时间:2016年4月22日(周五)下午5:00-6:00

地点:光电所二层报告厅

摘要: 量子技术,如量子通信、量子计算和量子传感,具有突破经典技术局限并将其性能推进到最终极限的潜力,因而受到广泛关注。然而要在实际应用中实现这种潜力,我们仍然面临很多挑战,其中包括如何克服实验噪声对于量子技术的影响,以及拓展量子技术的应用范围从而将其应用于经典技术无法解决的问题。在该报告中,我将汇报我们在这两个方面取得的一些初步进展,包括对噪声环境下量子精密测量方案的研究,以及对于光场与表面等离激元耦合过程的量子描述。

 

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报告题目:迈向芯片化集成化量子信息技术

报告人:金贤敏 教授(上海交通大学物理与天文系)

时间:2016年4月22日(周五)下午4:00-5:00

地点:光电所二层报告厅

摘要: 量子信息技术有望实现无条件安全的保密通信,随计算位呈指数增加的超高速计算,超越标准量子极限的精密测量和传感等革命性的技术飞跃。然而,宏观光学器件的尺寸、稳定性和集成度等看似技术上的限制,其实根本性地使得量子信息技术仍然只是停留在小尺度的原理性演示阶段。在科学上,通过芯片化构建大规模的量子系统将使得人类能够探索全新的量子世界和领域;在技术上,芯片化的量子器件和系统是推动量子信息技术实用化的必然,进而依托量子信息技术推动信息技术变革。报告将介绍我们针对宏观量子光学系统走向集成芯片面临的新问题开展的研究,包括在上海交大搭建的飞秒激光直写光量子集成芯片2.0平台、全光纤低损耗光耦合网络和量子光源上取得的研究进展。

 

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报告题目:悬浮纳米球光力学系统检验CSL塌缩模型

报告人:李杰

         (School of Science and Technology, Physics Division,  University of Camerino, Camerino (MC), Italy)

时间:2016年3月17日(周 四)下午4:00

地点:光电所二层报告厅

摘要:(波函数)塌缩模型[1]是一类理论假说,通过在薛定谔方程中引入一个非线性随机项(未知的塌缩噪声所致),用以解释宏观物体量子现象的缺失,是对经典量子力学的修正。当物体的尺寸(大小,内部粒子数等)大于一个值时(CSL模型设为100nm),塌缩噪声开始发挥显著作用,从而破坏量子叠加态,使得宏观量子现象难以观测。一些工作试图证明未知塌缩噪声来自引力(引力所致塌缩模型,Gravity kills Schrodinger's cat),但目前仍存在较大的争议,实验检验各种塌缩模型是判断其准确或真伪的唯一途径。
      我们提供了一个理论方案[2],基于囚禁悬浮纳米球光力学系统,来检验目前最为流行的CSL塌缩模型。悬浮纳米球系统的优势是其Q因子极高,可达10^10,热噪声极小,从而(极小的)塌缩噪声与经典噪声可比拟,使得实验检验塌缩模型成为可能。

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报告题目:量子信息技术

报告人:郭弘 教授(北京大学)

时间:2016316(周 三)下午4:30

地点:光电所二层报告厅

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报告题目:Spin-Orbit Coupling and Topological Phases for Cold Atoms: Theory and Experiments

报告人:刘雄军 教授(北京大学)

时间:2016118(周一)下午4:30

地点:光电所二层报告厅

摘要:Cold atoms with laser-induced spin-orbit (SO) interactions provide intriguing new platforms to explore novel quantum physics beyond natural conditions of solids. Recent years have witnessed remarkable theoretical and experimental progresses in the study of synthetic spin-orbit coupling and exotic phases for cold atoms. In this talk, I will focus on the realization of two-dimensional (2D) SO coupling and topological phases, and introduce the recent experimental progresses. This talk is organized in three parts. The first part will briefly introduce the background of SO coupling and topological phases in both condensed matter physics and cold atoms. Then, I will focus on our recent scheme for realizing SO interactions and exotic topological phases for cold atoms. Finally, I will introduce the experimental progress in observing 2D SO coupling and topological band with 87Rb Bose-Einstein condensates in an optical lattice.

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报告题目:Harnessing single photons in quantum technology

报告人:马小松 教授(南京大学)

时间:2015年12月11日(周五)下午4:30

地点:光电所二层报告厅

摘要Quantum technology employs the ‘spooky’ phenomena of quantum physics such as superposition, randomness and entanglement to process information in a novel way. Quantum photonics provides a promising path for both delivering quantum-enhanced technologies, including quantum simulation [1] and quantum communication [2], as well as exploring fundamental physics, including realizations of delayed-choice experiments [3-4] and nonlocal quantum eraser [5].

In this talk, I will first present our work on long-distance free-space quantum teleportation [6]. Quantum and classical channels were employed over 143 kilometers between two Canary Islands (La Palma to Tenerife). We successfully teleported the quantum states of single photons from La Palma to Tenerife. This demonstration represents a major step towards the realization of quantum communication on a global scale.

It is foreseeable that future technologies will require integrated optics architecture for enhanced performance, miniaturization and scalability. In the second part of my talk, I will cover our recent endeavors along this line, including demonstrations of on-chip interaction-free measurements via the quantum Zeno effect [7], as well as on-chip single-photon detection. Finally, I will discuss the opportunities and challenges for improving the scalability of photonic quantum systems.

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报告题目:Gravitational Wave Astronomy

报告人:Prof. David Blair (University of Western Australia)

时间:2015年11月25日(周 三)下午4:00

地点:光电所二层报告厅

摘要:Long baseline advanced gravitational wave detectors represent the state of the art in optical and mechanical engineering, and are the most sensitive optomechanical instruments ever created. In 2015 the Advanced LIGO detectors began operating at a sensitivity sufficient to detect predicted gravitational wave events from the distant universe for the first time. These 4km instruments operate near to the quantum limits of sensitivity, and yet they have the opportunity of substantial improvement through advanced optical engineering and quantum optics.
        This talk will review the status of gravitational wave detection, and will present ideas for future detectors that will take gravitational wave astronomy from exciting beginnings to an essential astronomical tool capable of monitoring the dynamical behaviour of spacetime arising from extreme events such as the birth of black holes across the universe. Plans for Australia-China collaboration in this field, recently funded by the Australian government, will be discussed.

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报告题目:Investigation of quantum hybrid systems formed of resonantly-coupled atoms/metamaterials

报告人:Prof. Martial Ducloy (Institute Galilee, University Paris-Nord)

时间:2015年10月23日(周五)下午4:00

地点:光电所二层报告厅

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报告题目:Improving linear optical "hardware" and "software" for quantum information processing

报告人:周晓祺 教授(中山大学 理工学院)

时间:10月17日(周六)上午10:00

地点:光电所二层报告厅

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报告题目:多体量子关联及其在量子信息中的应用探讨

报告人:何琼毅 研究员(北京大学物理学院)

时间:8月27日(周四)下午5:30

地点:光电所二层报告厅

摘要:量子纠缠、EPR steering(量子导引关联)、贝尔非定域性等量子关联是量子信息的核心资源,也是量子理论基础研究的重点问题。我们针对连续变量光场、原子系综、光力腔等物理系统,研究了不同量子关联的存在判据和实验检测方法,并针对量子技术需求,提出了相应的量子存储、精密测量、以及量子秘密共享等应用方案。本报告将主要介绍:基于多模光场系统以及微纳腔光机械复合系统的多体EPR关联的判定,以及相应的安全量子秘密共享方案。

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报告题目:超导纳米线单光子探测技术及其应用

报告人:尤立星研究员(中科院上海微系统与信息技术研究所,信息功能材料国家重点实验室)

时间:8月22日(周六)上午10:00

地点:光电所二层报告厅

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报告题目:Optical Hybrid Architectures for Quantum Information Processing

报告人:Dr. Kun Huang(Laboratoire Kastler Brossel, Paris)

时间:2015.8.15(周六)上午10:00

地点:光电所二层报告厅

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报告题目:Quantum networks with Ultrafast Frequency Comb

报告人:Prof.  Nicolas Treps (法国国家科学中心、LKB实验室)

时间:2015年7月13日(周一)下午4:30

地点:光电研究所二层报告厅

Nicolas的简历:Professor Nicolas Treps obtained his PhD in the quantum optics group of Laboratoire Kastler Brossel under the supervision of Claude Fabre, working on quantum effects in optical images. He then went to the Australian National University, group of Hans Bachor and Pink Koy Lam, for a post doctoral position on both quantum information and going beyond the standard quantum limit in high sensitivity optical measurement. Since 2002, he works at Laboratoire Kastler Brossel and University Pierre et Marie Curie, where he became full professor. After pursuing his work on quantum information and optical imaging, he started a new research line on quantum metrology and quantum information with optical frequency combs. His work led to about 80 papers in international peer reviewed journals and was funded by an ERC starting grant.

摘要: Ultrafast frequency combs have found tremendous utility as precision instruments in domains ranging from  frequency  metrology, optical clocks, broadband  spectroscopy, and 

absolute  distance measurement. This sensitivity  originates  from  the fact  that  a  comb  carries  a  huge  number  of co-propagating,  coherently-locked  frequency  modes. Accordingly, it  

is  the aggregate noise  arising  from  these  individual teeth  that  limits  the achievable  sensitivity  for  a  given measurement.  While  the distribution of  noise across  the comb  has  been 

examined, the role of correlations among various frequencies has gone largely unexplored. We have developed methods, inspired  from  quantum optics,  to  extract  amplitude  and phase  

correlations  among  a  multitude  of spectral bands. We can use it to study laser dynamics and perform quantum metrology experiments.

    But beyond characterizing the classical covariance matrix of an OFC, one can, using non-linear effects, manipulate this noise and eventually reduce it even bellow quantum vacuum noise, 

producing multimode nonclassical optical frequency combs. We have demonstrated that by proper control of non-linear crystals, optical cavities and pulse shaping it was possible to embed

 within an optical frequency comb up to 16 spectral/temporal modes  with  non-classical  noise  properties.  Furthermore,  dividing  the  spectrum  of  this  comb  into  10 frequency bands, 

entanglement is certified for all of the 115974 possible nontrivial partitions of this 10 mode state. This is the first demonstration of full multipartite entanglement and this source is shown to be

 a very promising candidate for scalable measurement based quantum computing.

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报告题目:Strong Atom-Light Interactions in Photonic Crystals

报告人: Prof.  Harry Jeffrey Kimble   ( California Institute of Technology , USA)

时间:2015年7月9日(周三)下午4:30

地点:光电研究所二层报告厅

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报告题目:弥散张量成像失真矫正及神经纤维束追踪

报告人:陈斌 教授 (美国Purdue University Calumet)

时间:2015年6月2日(周二)下午5:00

地点:光电所二层报告厅

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报告题目:Optical gain materials and coupled resonator structures for rotation sensing

报告人:Prof. Zhisong Xiao(Beihang University)

时间:2015.5.30(周六)上午10:00

地点:光电所二层报告厅

摘要:As a result of the rapid increase in information traffic there is a demand for broadband optical amplification beyond the conventional band of 1530-1625 nm (C+L-band) developed by erbium-doped amplifiers. In order to fully utilize the 1.4-1.7 mm low-loss band of silica-based optical fibers, the bands at 1440-1530 nm (S band) and 1625-1675 nm (U-band) are being explored. In this talk, we will also demonstrate how a very broad and flat emission band in the spectral region 1400-1700 nm can be achieved from RE codoped materials by adequately controlling the Er and Tm concentration ratio. Moreover, we will discuss how to control the concentration quenching due to cross-relaxation and energy diffusion to impurities.

Sagnac effect is investigated by related key optical factors like fast-light and active optical gain with coupled resonators, which allows for loss compensation, unidirectional propagation and enlarging the sensing area while maintaining the same bulk volume. In this case, the resonators are fabricated in Er3+ doped phosphate glass by the femetosecond laser directly writing (FsLDW). By introducing active gain into resonators to compensate the accumulated loss, it is theoretically predicted that the resolution limited by spontaneous emission noise is over three orders of magnitude smaller than that of the identical passive CROW gyroscope limited by the shot noise for the propagation loss of about 0.5 dB/cm.

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报告题目:Hybrid quantum information processing
报告人:Professor Akira Furusawa
(The University of Tokyo)
时间:2015年5月11日(周一),下午5:00
地点:光电所二层报告厅
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报告题目:Making larger entangled states of light

报告人:Professor Alexander Lvovsky

      (Department of Physics and Astronomy, University of Calgary, Canada)

时间:4月16日(周四)下午5:30

地点:光电研究所二层报告厅

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报告题目:Beyond quantum noise limit

报告人:Heng Shen(Niels Bohr Institute, University of Copenhagen)

时间:2015.4.10(周五)下午5:00

地点:光电所二层报告厅

摘要:

I will talk about different experiments on spin squeezing and entanglement involving room temperature ensembles of Cesium atoms. The key method is the off-resonant Faraday interaction of spin-polarized atomic ensemble with a light field. And the key component is the micro-fabricated vapor cell coupled into an optical cavity. Quantum backaction evading measurement of one quadrature of collective spin components by stroboscopically modulating the intensity of probe beam at twice Larmor frequency is used to generate the spin-squeezed state. A projection noise limited optical magnetometer at room temperature is reported. Furthermore, using spin-squeezing of atomic ensemble, the sensitivity of magnetometer is improved. Deterministic continuous variable teleportation between two distant atomic ensembles is demonstrated. The fidelity of teleportating dynamically changing sequence of spin states surpasses a classical benchmark, demonstrating the true quantum teleportation.

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报告题目:激光冷却极性分子

报告人:颜波(JILA, University of Colorado and National Institute of Standards and Technology, Boulder,  USA)

时间2015年1月21日(周三)下午5:00

地点光电研究所二层报告厅 

摘要:正像冷原子技术深刻地改变了原子物理研究一样,分子冷却后也有许多科学应用,例如精密测量,多体问题等等。但是现有的分子冷却方案只能将分子冷却到mK量级,另一方面,间接冷却方法能获得超冷分子,但受限于能冷却的原子种类。人们希望能直接将分子冷却到超冷温度,最近新发展起来的激光冷却分子方案,利用某些分子能级准闭合的特点,让分子散射足够多的光子,有望实现这一目标。我将报告激光冷却YO分子的最新研究进展,利用微波方案将不同的转动能级混合起来,我们观察到激光减速YO分子,此方案大大拓展了激光冷却分子的类型。

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报告题目:Manipulation and measurement of single atoms in Cavity QED system

报告人: 杜金锦

时间:2014.4.12上午10:00

地点:光电所二层报告厅

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报告题目:非线性损耗在单频激光器中的作用

报告人: 卢华东

时间:2013.6.22上午10:00

地点:光电所三层报告厅

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报告题目:多模非经典态的产生及量子测量

报告人:刘奎

时间:2013.6.15上午10:00

地点:光电所三层报告厅

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报告题目:A quantum effect in the classical limit: nonequilibrium tunneling in the Duffing model for qubit readout

报告人:Alec Maassen van den Brink (Research Center for Applied Sciences Academia Sinica, Taipei, Taiwan)

时间:2013.6.4下午5:00
地点:光电所三层报告厅

Abstract:The Duffing model is an oscillator with weak near-resonant driving, damping, and nonlinearity, which has often been studied in classical mechanics. For certain parameters, the stationary amplitude and phase bifurcate depending on initial conditions, and vary widely from one stable branch to the other. Due to this sensitivity, the system can be used for detection devices.

In recent years, a superconducting implementation—the so-called Josephson bifurcation amplifier (JBA)--has been successfully used experimentally for superconducting qubit readout. In the experimental literature, the JBA is often taken as classical. However, for e.g. understanding how the stability of the stationary states is modified by tunneling, a proper quantum analysis is necessary. Such tunneling transitions would be an error process from the point of view of detector applications. One thus has to study dissipative tunneling not between two potential wells, but between the limit cycles of a nonlinear dynamical system. Our numerical data, supported by semi-analytical asymptotic work, confirm the basic picture of dynamical tunneling. In addition, the results point at some intriguing aspects particular to the nonequilibrium setting, including noncommuting classical and low-temperature limits.

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报告题目:The generation of pulsed squeezed light

报告人:刘洪雨

时间:2013.5.25(周六)上午10:00
地点:光电所三层报告厅

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报告题目:热原子系综的大失谐Raman存储(Far-off-resonance Raman memory wtih hot atomic ensemble)

报告人:梁强兵

报告时间:2013.5.18(周六)上午10:00
报告地点:光电所三层报告厅

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报告题目1) Fulde-Ferrell pairing states in a Fermi gas with anisotropic spin-orbit coupling and Zeeman fields
报告人:易为 (中国科学技术大学)

摘要:
We study the phase diagram of a two-dimensional ultracold Fermi gas with the synthetic spin-orbit coupling (SOC) that has recently been realized at NIST. Due to the coexistence of anisotropic SOC and effective Zeeman fields in the NIST scheme, the system shows rich structure of phase separation involving exotic gapless superfluid and Fulde-Ferrell-Larkin-Ovchinnikov (FFLO) pairing states with different center-of-mass momentum. In particular, we characterize the stability region of FFLO states and demonstrate their unique features under SOC. We then show that the effective transverse Zeeman field in the NIST scheme can qualitatively change the landscape of the thermodynamic potential which leads to intriguing effects such as the disappearance of pairing instability, the competition between different FFLO states, and the stabilization of a fully gapped FFLO state. Finally, we discuss the general pairing physics under SOC and Fermi surface asymmetry.

 

报告题目2) 具有Rashba类型自旋轨道耦合的二维费米气体
报告人:张威(中国人民大学)
摘要:
在本次报告中,我们将聚焦具有Rashba类型自旋轨道耦合的二维费米气体中的两体问题和多体问题。通过求解该系统中的两体散射强度和两体束缚态,我们验证了传统的重整化关系在该体系中依然适用,且自旋轨道耦合会提高两体束缚能。同时,我们还系统刻画了该体系的相图,确定了非平庸拓扑超流相的存在区间。在大极化极限下,我们通过变分波函数,发现了体系中可能存在极化子-分子转变。最后,将这些讨论推广到准二维,我们发现由于自旋轨道耦合的存在,z方向自由度在共振点甚至BCS区域都是不可忽略。为刻画这些自由度的影响,我们提出了一个等效低能模型,并研究了这一模型和纯二维模型的区别。

 

报告时间:2013.5.11(周六)上午10:00
报告地点:光电所三层报告厅

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报告人:李瑛(日本 国家信息通讯研究院主任研究员)

报告题目:日本国家信息通讯研究院的光频标研究进展

报告时间:2013年5月4日(周六)上午10:00

报告地点:光电所三层会议室

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报告题目:Theoretical and Experimental Investigations of the LD pumped Er,Yb:YAB Laser
报告人: 李渊骥
时间:2013.04.20(周六)上午10:00
地点:光电所三层报告厅
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报告题目:Quantum Simulation with Atoms in Optical Lattices
报告人: Randall G. Hulet
Rice University, Department of Physics and Astronomy, Houston, TX
http://atomcool.rice.edu/
时间:2013.04.16 (星期二) 下午4:30
地点:光电所三层报告厅

Abstract:

Some of the most complex and vexing issues in electronic materials are modeled by extremely simple Hamiltonians. High-temperature superconductors, for example, may arise from magnetic interactions in a Mott insulating state, described by the simple Hubbard model. The Hubbard model stipulates that particles (electrons in the case of superconductors) are distributed in a square lattice where they can hop from site to site with a tunneling energy t, and where they may interact with occupied nearest neighbor sites with interaction energy U. No one knows whether this simple “hydrogen-atom” model actually gives rise to the d-wave pairing underlying the cuprate superconductors.
I will describe two experiments that use ultracold atoms in an optical lattice as stand-ins for the electrons in ionic lattices: 1) the Hubbard model in 3D; and 2) the polarized spin-½ Fermi gas in 1D. In the first experiment, we are searching for the anti-ferromagnetic Mott insulating state that is expected to exist above the superconducting transition when there is exactly one-atom per lattice site. We have used Bragg scattering of near-resonant light to characterize the lattice, and will use a spin-sensitive variant of this tool to detect magnetic correlations. In the second experiment, we have used an optical lattice in two-dimensions to create a bundle of 1D tubes containing an imbalanced two spin-state mixture of 6Li fermions. The phase diagram of this system contains three phases: a fully-paired superfluid, a fully-polarized ferromagnet, and a partially polarized state that is predicted to be the exotic FFLO superfluid state, for which the pairs have non-zero center of mass momentum.

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报告题目:Quantum-Enhanced metrology----------Optical interferometry
报告人: 李文芳
时间:2013.04.13 上午10:00
地点:光电所三层报告厅
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报告题目:Polarization Photonic State Memory
报告人:武跃龙
时间:2013.03.30 上午10:00
地点:光电所三层报告厅

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报告题目:The generation of 795 nm laser by frequency-doubling of the singly resonant optical parametric oscillator
报告人:李鹏
时间:2013.03.23 上午10:00
地点:光电所三层报告厅

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报告题目:全固态单频461nm钛宝石激光器的研究进展
报告人:李凤琴
报告时间:2013年3月16日(星期六)上午10:00
报告地点:光电所三层报告厅

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报告题目:Simultaneous fast and slow light effects based on degenerated FWM

报告人:姜其畅

指导老师:张俊香教授

报告时间:2013-3-1上午10点

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报告题目:Symmetry protected topological orders in interacting bosonic systems

报告人:陈谐
美国加州大学伯克利分校
Research Fellow
报告时间:2013年1月26日 下午3点

地点:光电所三层报告厅

摘要:The discovery of topologically ordered systems, like quantum hall and topological insulators, have greatly extended our knowledge of quantum many-body physics and it is highly desirable to know what topological orders exist in general. While in free fermion systems topological phases have been well characterized and even classified, it is unclear what happens when interaction between particles is taken into account. Are the topological features stable with interaction? Are there new topological phases in strongly interacting systems? In this talk, I will try to answer these questions for the subclass of 'symmetry protected topological(SPT) order' phases which are separated from a trivial phase only under symmetry constraint, for example a time reversal invariant topological insulator. I will show that by studying the universal many-body entanglement structures in the ground states of such phases, we can completely classify all SPT orders in 1D gapped systems and systematically construct new SPT models in two and higher dimensions and prove their stability even under strong interactions. Our approach of focusing on the entanglement structure of ground states allows us to treat any interaction on the same footing. Moreover, it is tightly connected to quantum information ideas and allows interesting interactions between the two fields.

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报告题目:连续变量多组份纠缠态光场制备的研究进展

报告人:贾晓军

报告时间:2013年1月19日 上午10点

地点:光电所三层报告厅

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报告题目:构建基于FPGA技术的测控系统
报告人:历炜 NI工程师
报告时间:8:30 2013.1.16
报告地点:山西大学光电研究所三层报告厅

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报告题目:部分相干光束的调控、传输及应用基础研究

报告人:蔡阳健 教授

(苏州大学物理科学与技术学院特聘教授,全国百篇优秀博士论文获得者)

报告时间:2013年1月12日(星期六) 上午 10:00

报告地点:山西大学光电研究所三层报告厅

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报告题目:Momentum-resolved Raman spectroscopy of bound molecules in ultracold Fermi gas

报告人:黄良辉

报告时间:2013年1月5日 上午10点

地点:光电所三层报告厅

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报告题目:Nano-photonics towards QIT with diamond and NV centers:
Fabrication and Detection
报告人:孙方稳 副教授
(中国科学技术大学需理学院, 中科院量子信息重点实验室)
地点:山西大学光电研究所三层报告厅
时间:2012年12月22日上午10点

Abstract:In this talk, I will present our recent research results on
diamond and Nitrogen-Vacancy (NV) centers.
We fabricate NV centers in diamond with nitrogen ions implantation. On this
sample, we develop a quantum
imaging method to distinguish two nearby NV centers without the restriction
of diffraction limit. Also, low
temperature measurement on NV centers shows that optical and electronic
transition energies tend to be
constant for temperature below 100 K, which indicates higher stability and
performance for quantum information
techniques and high resolution detection of electronic and magnetic field.
At the end, I will give a brief introduction
to our research on surface Plasmon for nano-photonic device.

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报告题目:具有自旋-轨道耦合的超冷原子之间的散射

报告人:张芃 ( (中国人民大学物理系)

报告时间:2012年12月15日 上午10点

地点:光电所三层报告厅

内容摘要:我们系统研究了具有自旋-轨道耦合超冷原子之间的散射问题。从第一性原理出发,我们发现当存在自旋轨道耦合的时候,原子之间的Bethe-Peierles边界条件需要修正。我们得出了修正的Bethe-Peierles边界条件,并以此为基础得出了原子之间低能散射振幅的解析表达式,以及求解低能束缚态的有效方法。应用我们的方法,我们与中科大实验小组合作,研究了存在自旋轨道耦合的系统中亚稳态原子的衰败问题。我们还讨论了准二维气体中存在自旋轨道耦合时候原子之间的散射振幅,束缚态能量和有效相互作用。

参考文献

[1] Peng Zhang, Long Zhang and Wei Zhang, Phys. Rev. A 86, 042707 (2012).

[2] Peng Zhang, Long Zhang, Youjin Deng, Phys. Rev. A 86, 053608 (2012).

[3] Long Zhang, Jin-Yi Zhang, Si-Cong Ji, Zhi-Dong Du, Hui Zhai, Youjin Deng, Shuai Chen, Peng Zhang, Jian-Wei Pan, arXiv:1208.4941.
[4] Long Zhang, Peng Zhang and Youjin Deng, arXiv:1211.6919

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报告题目:Preparation a single atom in an optical micro-traptowards the scalable implementation of multi-qubit

报告人:何军

报告时间:2012128 上午10

地点:光电所三层报告厅

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题目:Francium Spectroscopy Experiment at TRIUMF

报告人:张颉颃

报告时间:2012123 上午11

地点:光电所三层报告厅

2009年毕业于中国科学技术大学物理系,

现在在美国马里兰大学物理系及联合量子所(Joint Quantum Institute, JQI)攻读博士学位。

JQI是由诺贝尔物理学奖得主William Philips倡导,由美国国家标准局和马里兰大学联办的量子中心。在量子信息,冷原子物理,量子光学等领域都有出色的研究。

201110月至201211月,张颉颃在加拿大TRIUMF工作。TRIUMF是加拿大的核物理与粒子物理国家实验室,拥有世界上最大的质子回旋加速器,提供没有稳定同位素的放射性元素:钫。

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报告题目:Experimental preparation of eight-partite linear and two-diamond shape cluster states

报告人:郝树宏

报告时间:20121201日 上午10

地点:光电所三层报告厅