文献类型：期刊文献

中文题名：基于耦合腔系统的相互作用自由的全光开关

英文题名：Interaction-Free All-Optical Switching in Coupled Cavities

作者：刘甜甜[1];林功伟[1];郝亚明[1];周凤雪[1];龚尚庆[1];钮月萍[1]

机构：[1]华东理工大学理学院,上海200237

年份：2018

卷号：44

期号：3

起止页码：448

中文期刊名：华东理工大学学报（自然科学版）

外文期刊名：Journal of East China University of Science and Technology

收录：CSTPCD;;Scopus;北大核心:【北大核心2017】；CSCD:【CSCD_E2017_2018】；

基金：国家自然科学基金(11674094;11274112;91321101;61275215);中央大学基础研究基金(WM1313003)

语种：中文

中文关键词：耦合腔;相互作用自由;光开关;强耦合

外文关键词：coupled cavities;interaction-free;all-optical switching;strong coupling

摘要：利用量子干涉效应,在耦合腔系统中提出了一个相互作用自由的全光开关方案。在该方案中,两个腔通过光子隧穿效应耦合起来。当一个控制场与第二个腔中的原子相互作用时,信号光直接被第一个腔反射回去,因此信号光与控制光在原子-腔系统中没有发生直接耦合作用。本文方案即使在原子和腔之间不满足强耦合条件时也可以很好工作,从而放宽了实验条件下实现光开关的腔强耦合条件。
All-optical switching is important for applications in optical communications and quantum information networks.Generally,all-optical switching relies on the large optical nonlinearities induced in an optical medium by coupling of the signal and control light.However,the switching efficiency is limited by the photon loss due to absorption or scattering during the coupling of the signal light and control light.In order to operate an all-optical switch with low photon absorption or scattering,it is necessary to generate large optical nonlinearities in an interaction-free way,i.e.,the signal light and control light are not directly coupled in the optical medium.In this paper,we propose a scheme for the interaction-free alloptical switching in the coupled cavities based on the quantum interference effect.Two cavities are coupled by the photon tunneling effect.N Λ-type three level atoms are trapped in the second cavity and they are resonantly coupled to the cavity mode.When a control light is coupled to the atoms with a certain detuning,the input signal light is reflected by the first cavity such that there is no direct coupling between the control light and signal light in the atom-cavity system.Therefore,our scheme for all-optical switching is in an interaction-free manner.We only require the cavity condition √（g^2N＋J^2）〉〉κ,γ where g√N is the collective coupling coefficient between the cavity mode and atoms,Jis the tunneling coefficient between two cavities,κis the decay rate of the cavity mode,andγdenotes the decay rate of excited state of the atoms.When J〉〉κ,γ,even though the cavity strong coupling condition g √N 〉〉κ,γis not satisfied,the required condition in our scheme √（g^2N＋J^2）〉〉κ,γcan still be satisfied well,which can relax strong coupling conditions in the experimental implementation of all-optical switching.The scheme proposed in this paper offers a promising approach to achieve the interaction-free all-optical switching.