三体系统量子纠缠度特性研究  

Quantum entanglement degree of three-body systems

作　　者：杨富社[1] 王菊霞[2] 

机构地区：[1]长安大学理学院,陕西西安710064 [2]渭南师范学院物理与电子工程系,量子光学与光子学研究所,陕西渭南714000

出　　处：《陕西师范大学学报（自然科学版）》2011年第1期33-37,共5页Journal of Shaanxi Normal University：Natural Science Edition

基　　金：陕西省自然科学基金资助项目(SJ08A25);陕西省教育厅专项科研基金资助项目(08JK286)

摘　　要：应用量子计算方法,对三原子体系中三体间、两两间以及Tavis-Cummings模型系统的纠缠度进行了详细计算.通过求解原子与光场相互作用系统态矢满足的薛定谔方程,得出了该模型三体间纠缠度随时间的演化规律.结果表明:原子光场相互作用系统的纠缠度呈现随时间变化的周期振荡性,周期大小与系统初始状态有关.系统中三体间的纠缠度与三体中两两间纠缠度的振荡周期有关.随着时间的变化,体系由开始的非纠缠状态可演化为三体最大或部分纠缠态.Using the method of quantum calculation,the entanglement degrees of the threebody system,any two-body among the them,and the Tavis-Cummings model system are calculated in detail.The evolution property of three-body entanglement degree is showed via solving the Schrdinger equation of the atom-light field system.It is found that the entanglement degree of the atom-light field system shows the periodic oscillations with the time and the cycle is closely related to the initial state of the system.The entanglement degree in the three-body system has the same cycle as that of the any two-body in the three-body system.The system will evolve to a three-body maximum or partly entangled state from the initial non-entangled state.

关 键 词：量子光学 纠缠态 三体纠缠 纠缠度 

分 类 号：O413.1[理学—理论物理]