Parity-dependent unidirectional and chiral photon transfer in reversed-dissipation cavity optomechanics  

作　　者：Zhen Chen Qichun Liu Jingwei Zhou Peng Zhao Haifeng Yu Tiefu Li Yulong Liu 

机构地区：[1]Beijing Academy of Quantum Information Sciences,Beijing 100193,China [2]CAS Key Laboratory of Microscale Magnetic Resonance,University of Science and Technology of China,Hefei 230026,China [3]School of Integrated Circuits and Frontier Science Center for Quantum Information,Tsinghua University,Beijing 100084,China

出　　处：《Fundamental Research》2023年第1期21-29,共9页自然科学基础研究（英文版）

基　　金：supported by the China Postdoctoral Science Foundation under Grant No.2021M700442;Y.L.Liu acknowledges the support of the Natural Science Foundation of China(NSFC)under Grant No.12004044;H.F.Y acknowledges the support from the NSFC of China(11890704);the NSF of Beijing(Z190012);T.F.Li acknowledges the support of the Development Program of China(2016YFA0301200);the National Natural Science Foundation of China(62074091,and U1930402);the Science Challenge Project(TZ2018003);Tsinghua University Initiative Scientific Research Program.

摘　　要：Nonreciprocal elements,such as isolators and circulators,play an important role in classical and quantum information processing.Recently,strong nonreciprocal effects have been experimentally demonstrated in cavity optomechanical systems.In these approaches,the bandwidth of the nonreciprocal photon transmission is limited by the mechanical resonator linewidth,which is arguably much smaller than the linewidths of the cavity modes in most electromechanical or optomechanical devices.In this work,we demonstrate broadband nonreciprocal photon transmission in the reversed-dissipation regime,where the mechanical mode with a large decay rate can be adiabatically eliminated while mediating anti-PT-symmetric dissipative coupling with two kinds of phase factors.Adjusting the relative phases allows the observation of periodic Riemann-sheet structures with distributed exceptional points(Eps).At the Eps,destructive quantum interference breaks both theT-andP-inversion symmetry,resulting in unidirectional and chiral photon transmissions.In the reversed-dissipation regime,the nonreciprocal bandwidth is no longer limited by the mechanical mode linewidth but is improved to the linewidth of the cavity resonance.Furthermore,we find that the direction of the unidirectional and chiral energy transfer could be reversed by changing the parity of the Eps.Extending non-Hermitian couplings to a three-cavity model,the broken anti-PT-symmetry allows us to observe high-order Eps,at which a parity-dependent chiral circulator is demonstrated.The driving-phase controlled periodical Riemann sheets allow observation of the parity-dependent unidirectional and chiral energy transfer and thus provide a useful cell for building up nonreciprocal array and realizing topological,e.g.,isolators,circulators,or amplifiers.

关 键 词：Dissipation-reversed cavity optomechanics Nonreciprocal photon transfer Odd-even exceptional points Anti-PT symmetry Chiral circulators 

分 类 号：O413[理学—理论物理]