相位阻尼下Bell对角态的演化  

Evolution of Bell-Diagonal State under Phase Damping

作　　者：宋世学[1,2] 

机构地区：[1]济南大学理学院,山东济南250022 [2]中国科学技术大学物理学院,安徽合肥230026

出　　处：《济南大学学报（自然科学版）》2010年第4期407-410,共4页Journal of University of Jinan(Science and Technology)

基　　金：山东省青年教师国内访问学者与国际合作培养计划;教育部高等学校青年骨干教师国内访问学者计划

摘　　要：导出相位阻尼下Bell对角态的演化密度矩阵,计算演化态的量子关联(纠缠,quantum discord,quantum disso-nance)和经典关联。计算结果表明:在演化过程中量子关联逐渐消失,经典关联增加,在量子关联全部消失后经典关联就是总关联,Bell对角态关联是次可加的;在所有的量子关联中纠缠最为脆弱易于发生退纠缠,在外界环境作用下quantum discord也可死亡与重生。The evolution of Bell-diagonal state under phase damping is derived,and the quantum correlations,including entanglement,quantum discord and quantum dissonance,and classical correlation,are calculated.The results show that during evolution quantum correlations disappear in asymptotic time and classical correlation increases,up to the total correlation,which is subadditive for Bell-diagonal state;among quantum correlations entanglement is most fragile and easy to disentangle,and death and rebirth occur in quantum discord.

关 键 词：相位阻尼 经典与量子关联 演化 

分 类 号：O431.1[机械工程—光学工程]