单模腔场与桩型三能级原子共振作用熵的纠缠演化  

作　　者：张蕾[1] 

机构地区：[1]西安建筑科技大学华清学

出　　处：《科技视界》2020年第26期84-86,共3页Science & Technology Vision

基　　金：陕西省教育厅科研项目(18JK025)。

摘　　要：基于一个三能级原子与单模腔场共振作用,研究了系统原子熵的演化特性,通过量子熵,分析了原子初始状态以及原子-腔场的耦合系数对原子熵的影响.结果表明:原子初始无论处于何种状态,系统熵随时间周期性变化,并且其最大纠缠度随着兹值的增大而减小;原子-腔场的耦合系数对系统熵的周期性(双峰)现象有影响,当k取合适值时双峰现象近乎消失.A scheme is proposed to study the evolution properties of atom entropy in the system of aΞ-type three-level atom interacting with a single-mode field.The atom entropy of the system are influenced by the initial state of atom and atom-field coupling constants,which are discussed by using the numerical method.The results indicate that atom entropy appears with periodicity whatever the initial state of atom is.The maximum entanglement value of the system decreases whenθincreases.Atom-field coupling constants has an effect on the periodic(bimodal)phenomenon of the system entropy,and the bimodal phenomenon of atom entropy evolution almost disappears when k is set to an appropriate value.

关 键 词：单模腔场 共振 密度矩阵 熵 

分 类 号：O56[理学—原子与分子物理]