非对称单巨原子腔阵列波导QED系统中的单光子散射  

Single-photon Scattering in a Waveguide-QED System with a Giant Atom Asymmetrically Coupled to a Resonator-array Waveguide

作　　者：余梦婷 贾文志 YU Mengting;JIA Wenzhi(School of Physical Science and Technology,Southwest Jiaotong University,Chengdu 610031,Sichuan)

机构地区：[1]西南交通大学物理科学与技术学院,四川成都610031

出　　处：《四川师范大学学报（自然科学版）》2023年第6期761-765,共5页Journal of Sichuan Normal University（Natural Science）

基　　金：国家自然科学基金(61871333和12147208)。

摘　　要：研究单巨原子腔阵列波导量子电动力学(quantum electrodynamics,QED)系统在不对称耦合情形下的单光子散射态.在实空间中推导出系统散射振幅的解析解,并据此分析巨原子通过2个耦合点与波导非对称耦合时,耦合的不对称度和耦合点间距等因素对单光子散射谱的影响.发现,如果巨原子2个耦合点非对称度较大,这时无论耦合点间距大小,系统的散射谱均与小原子类似;而如果非对称度较小且耦合点间距较大时,由于巨原子的非偶极效应的影响,散射谱会出现与小原子截然不同的线型.The single-photon scattering states in a waveguide-QED system of a single giant atom asymmetrically coupled to a resonator-array waveguide are investigated.We derive the analytical expressions for the scattering amplitudes of the system in real space.We focus on the case that the giant atom is asymmetrically coupled to the waveguide through two coupling points,and analyze the influence of the coupling asymmetry and the distance between the coupling points on the single-photon scattering spectrum.We find that when the asymmetry of the two coupling points of the giant atom is large,the scattering spectrum is similar to that of the small atom,regardless of the distance between the coupling points.On the other hand,if the asymmetry is small and the distance between the coupling points is large,the scattering spectrum will have a very different line shape from that of the small atom due to the non-dipole effects of the giant atom.

关 键 词：波导QED 巨原子 单光子散射 非对称耦合 

分 类 号：O431.2[机械工程—光学工程]