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物理学科学术报告(New York University Shanghai, Tim Byrnes和Daniel Stein 教授)

发布者:物电研究生办   发布时间:2019-05-07  浏览次数:134

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报告题目一】Quantum clock  synchronization without synchronized clocks

【报告人】Tim Byrnes  教授,New York University  (NY)

【时间】510日(星期五)上午 9:  00-10:00

【地点】29#-414

A major outstanding problem for many  quantum clock synchronization  protocols is the hidden assumption of a common  phase reference between  the parties to be synchronized. In general, the  definition of the  quantum states between two parties do not have consistent  phase  definitions, which can lead to an unknown systematic error. We show that   despite prior arguments to the contrary, it is possible to remove this  unknown  phase via entanglement purification. This closes the loophole  for entanglement  based quantum clock synchronization protocols, which is  a non-local approach to  synchronize two clocks independent of the  properties of the intervening medium.  Starting with noisy Bell pairs, we  show that the scheme produces a singlet  state for any combination of  (i) differing basis conventions for Alice and Bob;  (ii) an overall time  offset in the execution of the purification algorithm; and  (iii) the  presence of a noisy channel. Error estimates reveal that better   performance than existing classical Einstein synchronization protocols  should  be achievable using current technology.

References

[1] Ebubechukwu  O. Ilo-Okeke, Louis Tessler, Jonathan P. Dowling and Tim Byrnes, npj Quantum  Information  4, 40 (2018).

[2]  R. Jozsa, D.  S. Abrams, J. P. Dowling, and C. P. Williams, Phys. Rev. Lett. 85, 2010  (2000).

【编辑概况Tim  Byrnes is Assistant Professor of Physics at NYU Shanghai. He is also  Visiting  Assistant Professor at the National Institute of Informatics  in Tokyo, Japan.  He holds a PhD from the University of New South Wales  in Sydney,  Australia.

Professor Byrnes' research  interests are in quantum  information technologies, condensed matter  physics, and AMO (atomic, molecular,  optical) physics. Specifically, he  is interested in various applications of  Bose-Einstein condensates to  quantum information. He is also interested in the  interface of physics  and biology and emergent phenomena.

Tim Byrnes  completed his  Ph.D. at the University of New South Wales in Sydney, Australia  in the  fields of condensed matter physics and high energy physics under the   supervision of Prof. Chris Hamer.  During this time he worked on  applications  of DMRG (Density Matrix Renomalization Group), a powerful  method for solving 1D  quantum many-body problems, to lattice gauge  theories.  He then moved to Tokyo,  Japan to commence a postdoctoral  fellowship with Prof. Yoshihisa Yamamoto in  the field of quantum  information at the National Institute of Informatics and  the University  of Tokyo.  There he worked on topics related to quantum  simulation, such  as methods of solving lattice gauge theories on a quantum  computer, and  semiconductor implementations of a quantum simulator.  He has  worked on  the theory of Bose-Einstein condensation in exciton-polariton  systems,  such as the BEC-BCS crossover and applications to the generation of   non-classical light.

He is now Assistant Professor at NYU  Shanghai,  where he examines Bose-Einstein condensates for various  applications in quantum  information technology.

 

报告题目二】Nature vs. Nurture in  Complex (and Not-So-Complex) Systems

【报告人】Daniel  Stein 教授,New York University  Shanghai

【时间】510日(星期五)上午 10:  00-11:00

【地点】29#-414

Understanding the dynamical behavior  of many-particle systems following a deep quench is a central issue in both  statistical mechanics and complex systems theory. One of the basic questions  centers on the issue of predictability: given a system with a random initial  state evolving through a well-defined stochastic dynamics, how much of the  information contained in the state at future times depends on the initial  condition (``nature'') and how much on the dynamical realization (``nurture'')?  We discuss this question and present both old and new results for both  homogeneous and random systems in low and high dimension.

【编辑概况Daniel  L. Stein is Professor of Physics and Mathematics at New York University. From  2006-2012 he served as NYU Dean of Science.  Prior to coming to NYU, he served  on the faculties at Princeton University and at the University of Arizona, where  he was Head of the Department of Physics for a decade. He received his Ph.D. In  Physics from Princeton University in 1979.

His research is in the fields  of theoretical condensed matter physics, statistical mechanics, and biological  physics.  It focuses primarily on randomness and disorder in condensed matter  systems, with an emphasis on magnetic materials and on stochastic processes  leading to rare nucleation events.  In addition, he has worked on topics as  diverse as protein biophysics, biological evolution, amorphous semiconductors,  superconductors and superfluids, liquid crystals, neutron stars, and the  interface between particle physics and cosmology.

His awards include a  Princeton University C.E. Proctor Fellowship, an Alfred P. Sloan Fellowship,  University of Arizona College of Science Distinguished Teaching Award,  Commission on the Status of Women Vision 2000 Award, election as a Fellow of the  American Physical Society, election as a Fellow of the American Association for  the Advancement of Science, the U.S. Air Force Exemplary Civilian Service Medal,  and a John Simon Guggenheim Foundation Fellows.

【邀请人】李慧军,  高先龙

欢迎各位老师和同学参加.

 


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