On-chip single-photon chirality encircling exceptional points  

作　　者：Zhen-Nan Tian Feng Yu Xu-Lin Zhang Kai Ming Lau Li-Cheng Wang Jensen Li C.T.Chan Qi-Dai Chen 

机构地区：[1]State Key Laboratory of Integrated Optoelectronics,College of Electronic Sci-ence and Engineering,Jilin University,Changchun 130012,China [2]Department of Physics,The Hong Kong University of Science and Technology,Clear Water Bay,Hong Kong 999077,China

出　　处：《Chip》2023年第4期71-77,共7页芯片（英文）

基　　金：supported by National Natural Sci-ence Foundation of China(NSFC)under Grants 61825502,11974140 and#61827826;Scientific and Technological Development Plan Program of Jilin Province(SKL202302012);Work done in Hong Kong was supported by RGC Hong Kong(N_HKUST608/17,AoE/P-502/20 and C6013-18G-A)and by the Croucher Foundation.

摘　　要：Exceptional points(EPs),which are typically defined as the degener-acy points of a non-Hermitian Hamiltonian,have been investigated in various physical systems such as photonic systems.In particular,the intriguing topological structures around EPs have given rise to novel strategies for manipulating photons and the underlying mechanism is especially useful for on-chip photonic applications.Although some on-chip experiments with the adoption of lasers have been reported,EP-based photonic chips working in the quantum regime largely re-main elusive.In the current work,a single-photon experiment was proposed to dynamically encircle an EP in on-chip photonic waveg-uides possessing passive anti-parity-time symmetry.Photon coinci-dences measurement reveals a chiral feature of transporting single photons,which can act as a building block for on-chip quantum de-vices that require asymmetric transmissions.The findings in the cur-rent work pave the way for on-chip experimental study on the physics of EPs as well as inspiring applications for on-chip non-Hermitian quantum devices.

关 键 词：Non-Hermitian photonics Photonic chip Exceptional points Single photons 

分 类 号：TN24[电子电信—物理电子学]