报告题目 (Title)：Fractional Quantum Zeno Effect Emerging from Non-Hermitian Physics（非厄米物理涌现出的分数量子芝诺效应）

报告人 (Speaker)：胡颖 教授（山西大学）

报告时间 (Time)：2023年11月20日(周一) 14:00-16:00

报告地点 (Place)：校本部 G313

邀请人 (Inviter)：张永平

主办部门：理学院物理系

摘要 (Abstract)：

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. This fractional scaling originates uniquely from the divergent dissipative density of states near the dissipation band edge, different from the traditional closed-bath context. 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].

References:

[1]. Phys. Rev. X 13, 031009 (2023)

[2]. Phys. Rev. Lett. 130, 153602 (2023)