Kerr相互作用下量子相干性分布和量子信息流动  

The distribution of quantum coherence and transfer of quantum information with Kerr medium

作　　者：贺启亮[1] 丁敏 宋晓书[1] 吕兵[1] HE Qi-Liang;DING Min;SONG Xiao-Shu;Lü Bing(School of Physics and Electronics,Guizhou Normal University,Guiyang 550001,China)

机构地区：[1]贵州师范大学物理与电子科学学院,贵阳550001

出　　处：《原子与分子物理学报》2021年第2期117-125,共9页Journal of Atomic and Molecular Physics

基　　金：国家自然科学基金(11364006,11264008);贵州省科技计划项目(黔科合LH字[2017]7343);贵州省普通高等学校低维凝聚态物理重点实验室项目(黔教合KY字[2016]002);贵州师范大学博士基金。

摘　　要：本文针对Kerr相互作用下系统中量子相干性的动力学分布进行了研究.所讨论系统包含两个没有相互作用的原子,每个原子都被囚禁在各自的光腔中,同时光腔被充满了非线性Kerr介质.研究发现非线性Kerr相互作用能够增加两原子间的量子相干性,而且增大的幅度会随着Kerr相互作用强度的增加而得以提高.其次,借助迹距离的方法,还探讨了非线性Kerr相互作用对于原子与光腔之间的量子信息流动的影响,发现Kerr相互作用可以加快量子信息回流到原子子系统中,抑制原子子系统与其余子系统间的量子信息交换,阻碍量子信息在系统中不同子系统间的流动,从而保护原子子系统中拥有的量子信息.The distribution of quantum coherence of a system has been investigated.The system consists of two non-interacting two-level atoms,each is trapped in a single-mode optical cavity which is filled with a nonlinear Kerr medium.It is found that the amount of quantum coherence of two atoms can be increased by adjusting the value of the Kerr medium,and with the increase of the value of the Kerr medium,the increasing amplitude of quantum coherence will enhance.Furthermore,we also explore the influence of nonlinear Kerr medium on the transfer of quantum information by making use of trace distance.It is shown that the Kerr medium can accelerate the quantum information to flow back to two atoms from other subsystems,suppress the exchange of the quantum information between two atoms and other subsystems,and hinder the flow of quantum information between different subsystems in the system,which means that the Kerr medium can protect the quantum information contained in the atom subsystem.

关 键 词：量子相干性 量子信息流动 Kerr相互作用 

分 类 号：O431.2[机械工程—光学工程]