克尔介质对依赖强度耦合的J-C模型纠缠度演化特性的影响  

The Impact of Kerr Medium on the Evolution Characteristics of Entanglement Degree in the Intensity-dependent Coupling J-C Model

作　　者：王菊霞[1,2] 

机构地区：[1]渭南师范学院物理与电子工程系,陕西渭南714000 [2]渭南师范学院量子光学与光子学研究所,陕西渭南714000

出　　处：《渭南师范学院学报》2011年第2期3-6,共4页Journal of Weinan Normal University

基　　金：陕西省教育厅专项科研计划项目(2010JK539);渭南师范学院科研培育项目(11YKP015)

摘　　要：利用密度矩阵的部分转置矩阵负本征值的方法,研究了附加Kerr介质依赖强度耦合J-C模型中原子与光场纠缠度随时间的演化特性,讨论了Kerr介质对原子-光场纠缠度的影响.结果表明:原子与光场间的纠缠度随时间作周期性演化,其演化周期由光场与原子耦合强度以及光场与介质相互作用强度来确定,而且随着强度的增加而减小;纠缠度的数值随光场光子数的增多而明显减小,或随着光场与原子耦合强度和光场与介质相互作用强度的增加而减小,并且其纠缠程度会随光场的初始状态的不同而产生明显的变化.The evolution properties of entanglement degree between the light fields and atoms in the additional Kerr medium intensity-dependent coupling J-C model is researched by use of the method of part of the density matrix transpose matrix of negative eigenvalue, and the influence of Kerr medium on entanglement degree can be discussed as well. It is found that the time evolution of atom-field entanglement degree oscillate periodically. The period depends on the strengths of the field-atom coupling and field-medium interaction, and the period becomes smaller with the increase of the strengths. The cycle will reduce gradually with the intensity increasing. The entanglement degree reduces significantly with the number of photons rising or with the strengths of the field-atom coupling and field-medium interaction increasing. The initial state of the field plays an important role in the atom-field entanglement degree.

关 键 词：量子光学 KERR介质 纠缠度 演化特性 

分 类 号：O431.2[机械工程—光学工程]