基于腔QED系统的几何量子失谐及其传送（英文）  

The dynamics of geometric discord and its transfer in cavity quantum electrodynamics system

作　　者：王丽萍[1] 吴韬[1] 

机构地区：[1]阜阳师范学院物理与电子工程学院,阜阳236037

出　　处：《原子与分子物理学报》2017年第4期704-710,共7页Journal of Atomic and Molecular Physics

基　　金：安徽省高校优秀青年人才支持计划重点项目(gxyqZD2016190);安徽省教育厅自然科学研究重点项目(KJ2013A205);阜阳师范学院教学研究项目(2014JYXM18,2015JYXM34)

摘　　要：研究了基于腔量子电动力学(腔QED)系统的几何量子失谐及其传送.该系统包括两个独立的子系统,每个子系统由两个二能级原子与单模腔共振相互作用.结果表明,所有初始存储在原子A_1A_2中的几何量子失谐最终被转移到原子B_1B_2和腔C_1C_2.同时,原子A_1A_2,B_1B_2和腔C_1C_2的几何量子失谐在该量子系统中可以发生猝死(DSD)以及纠缠突然死亡(ESD).但是,在该量子系统中几何量子失谐不能完全由于原子的自发辐射和腔衰减而复活.此外,原子A_1A_2,B_1B_2和腔C_1C_2几何量子失谐的量,取决于其纯度p,并与其成比例,p的值越小,几何失谐越小.它也表明,在原子自发辐射和腔衰减的情况下,原子A_1A_2,B_1B_2和腔C_1C_2的几何量子失谐将经历振荡衰减并最终衰减到零.不过,在没有原子自发辐射和腔衰减的情况下,原子A_1A_2,B_1B_2和腔C_1C_2的几何量子失谐却没有衰减.We investigate the dynamics of geometric discord and its transfer in a cavity quantum electrodynamics （ cavity QED） system consisting of two independent subsystems each of which consists two two - level atoms reso- nantly interacting with a single -mode cavity. It is shown that all the geometric discord initially stored in the at- oms AIA2 are eventually transferred to atoms B1B2 and cavities C1C2. Meanwhile, the geometric discord of atoms A1A2, atoms B1B2 and cavities C1C2can exhibit discord sudden death （DSD） as well as entanglement sudden death （ESD） in the presented quantum system. However, it is shown that the geometric discord cannot revive completely due to the atomic spontaneous emission and cavity decay. Furthermore, the amount of geometric dis- cord of atoms A^A2, atoms B^B2 and cavities C^C2 depend on the purityp and it is proportional top , the smaller the value ofp , the smaller the amount of geometric discord. It is also shown that the geometric discords of atoms A^A2, atoms B1B2 and cavities C^C2 all experience oscillatory damping and eventually decay to zero in the long - time limit in the case of the atomic spontaneous emission and cavity decay. However, in the case of without a- tomic spontaneous emission and cavity decay, the geometric discords of atoms A1A2, atoms B1B2 and cavities C1C2 can periodically alter from time t = 0 , there is no damping for the geometric discord.

关 键 词：量子关联 几何量子失谐 腔QED 

分 类 号：O431.2[机械工程—光学工程]