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通知公告
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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). -----------------------------------------------------------------------------------------------------------------------------------------------------
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 -----------------------------------------------------------------------------------------------------------------------------------------------------
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 -----------------------------------------------------------------------------------------------------------------------------------------------------
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。 -----------------------------------------------------------------------------------------------------------------------------------------------------
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. -----------------------------------------------------------------------------------------------------------------------------------------------------
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 -----------------------------------------------------------------------------------------------------------------------------------------------------
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 -----------------------------------------------------------------------------------------------------------------------------------------------------
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 -----------------------------------------------------------------------------------------------------------------------------------------------------
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. -----------------------------------------------------------------------------------------------------------------------------------------------------
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 -----------------------------------------------------------------------------------------------------------------------------------------------------
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. -----------------------------------------------------------------------------------------------------------------------------------------------------
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。 -----------------------------------------------------------------------------------------------------------------------------------------------------
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. -----------------------------------------------------------------------------------------------------------------------------------------------------
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. -----------------------------------------------------------------------------------------------------------------------------------------------------
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. -----------------------------------------------------------------------------------------------------------------------------------------------------
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. -----------------------------------------------------------------------------------------------------------------------------------------------------
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 -----------------------------------------------------------------------------------------------------------------------------------------------------
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. -----------------------------------------------------------------------------------------------------------------------------------------------------
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。 -----------------------------------------------------------------------------------------------------------------------------------------------------
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. -----------------------------------------------------------------------------------------------------------------------------------------------------
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. -----------------------------------------------------------------------------------------------------------------------------------------------------
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. -----------------------------------------------------------------------------------------------------------------------------------------------------
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. -----------------------------------------------------------------------------------------------------------------------------------------------------
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 -----------------------------------------------------------------------------------------------------------------------------------------------------
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（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： 2017年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年7月21日 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. -----------------------------------------------------------------------------------------------------------------------------------------------------
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 -----------------------------------------------------------------------------------------------------------------------------------------------------
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 -----------------------------------------------------------------------------------------------------------------------------------------------------
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 -----------------------------------------------------------------------------------------------------------------------------------------------------
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 -----------------------------------------------------------------------------------------------------------------------------------------------------
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 -----------------------------------------------------------------------------------------------------------------------------------------------------
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. -----------------------------------------------------------------------------------------------------------------------------------------------------
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。 -----------------------------------------------------------------------------------------------------------------------------------------------------
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。 -----------------------------------------------------------------------------------------------------------------------------------------------------
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 -----------------------------------------------------------------------------------------------------------------------------------------------------
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. -----------------------------------------------------------------------------------------------------------------------------------------------------
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. -----------------------------------------------------------------------------------------------------------------------------------------------------
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 -----------------------------------------------------------------------------------------------------------------------------------------------------
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 -----------------------------------------------------------------------------------------------------------------------------------------------------
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 -----------------------------------------------------------------------------------------------------------------------------------------------------
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 -----------------------------------------------------------------------------------------------------------------------------------------------------
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：波-粒延迟选择试验
报告人：郑仕标 福州大学物理系
时间：2016年4月16日（周六）上午10:00
地点：光电所二层报告厅
摘要：
波粒二象性是量子力学的一个基本特征，被著名物理学家费曼称为“包含了量子力学唯一的奥秘”。按照玻尔互补原理，一个量子系统同时具有波动性和粒子性，但这两种属性不能被同时观测到；系统表现出哪种属性取决于实验装置。为了诠释这一观点，Wheeler提出了延迟选择思想实验，即在粒子进入干涉仪后再选择实验装置的类型。在本报告中，我们先回顾经典的Wheeler延迟选择思想实验及其实验进展，然后说明量子延迟选择实验，并介绍其在光学系统中的实现。最后，结合超导电路系统，阐述基于类薛定谔猫分束器的量子延迟选择实验。
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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：2016年3月16日（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：2016年1月18日（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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