报告时间：2023年9月21日下午2:30
地点：实验室一楼会议室
报告人：胡颖 山西大学教授
邀请人：许小冶教授
报告题目：Fractional quantum Zeno effect emerging from non-Hermitian physics
摘要：
    Exploring non-Hermitian phenomenology is an exciting frontier of modern physics. However, the demonstration of non-Hermitian phenomenon that is quantum in nature has remained elusive. Here we predict the quantum non-Hermitian phenomena, the fractional quantum Zeno (FQZ) effect and FQZ-induced photon antibunching [1]. We consider a quantum optics platform with reservoir engineering, where nonlinear emitters are coupled to a bath of decaying bosonic modes whose own decay rates form band structures. By engineering the dissipation band, the spontaneous emission of emitters can be suppressed by strong dissipation through an algebraic scaling with fractional exponents - the FQZ effect. We find FQZ-induced strong photon antibunching in the steady state of a driven emitter even for weak nonlinearities. Remarkably, we identify that the sub-poissonian quantum statistics of photons, which has no classical analogues, stems here from the key role of non-Hermiticity. Our setup is experimentally feasible with the techniques used to design lattice models with dissipative couplings [2].
参考文献：
[1]. Phys. Rev. X 13, 031009 (2023) 
[2]. Phys. Rev. Lett. 130, 153602 (2023)
报告人简介：
    胡颖 教授，博导，国家高层次人才计划入选者。博士毕业于美国范德堡大学。先后在香港浸会大学非线性科学中心、北京大学量子材料科学中心、奥地利因斯布鲁克量子光学与量子信息研究所Peter Zoller教授组从事博士后研究。2017年加入激光光谱研究所。研究领域包括基于光与原子的新奇量子相、量子调控与量子测量、开放与非平衡多体量子系统等前沿交叉领域。

编辑时间：2023-09-11 09:09:54