学术活动

学术活动

Topology in parity-time-symmetric quantum walks

时间:11月22日10:00

?地点: 实验楼715会议室

主讲人:薛鹏 

主办单位: 物理系

主讲人简介:

    薛鹏,女,北京计算科学研究中心教授,博导。1999年于中国科学技术大学理系毕业,获得学士学位,并免试进入本校中科院量子信息重点实验室攻读博士学位,师从郭光灿院士,2004年7月获得博士学位。之后赴奥地利因斯布鲁克大学物理系、奥地利科学院量子光学和量子信息研究所,以及加拿大卡尔加里大学物理系作为博士后从事量子信息的物理实现以及量子光学的基础研究工作,致力于利用量子行走实现普适的量子信息处理平台的研究工作。2009年回国加入东南大学物理学院,2018年调入北京计算科学研究中心。在国际学术期刊包括:Nature Physics, Physical Review Letters等以第一/通信作者发表学术论文百余篇,引用千余次,多篇论文单篇引用超过百次。

讲座摘要:

    The study of non-Hermitian systems with parity-time (PT) symmetry is a rapidly developing frontier in recent years. Experimentally, PT-symmetric systems have been realized in classical optics by balancing gain and loss, which holds great promise for novel optical devices and networks. Here we report the first experimental realization of passive PT-symmetric quantum dynamics for single photons by temporally alternating photon losses in the quantum walk (QW) interferometers. The ability to impose PT symmetry allows us to realize and investigate Floquet topological phases driven by PT-symmetric QWs. We observe topological edge states between regions with different bulk topological properties and confirm the robustness of these edge states with respect to PT-symmetry-preserving perturbations and PT-symmetry-breaking static disorder. Our results pave the way for realizing quantum mechanical PT-synthetic devices and augur exciting possibilities for exploring topological properties of non-Hermitian systems using discrete-time QWs.

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