双模相干光场与原子依赖强度耦合双光子过程的纠缠演化  

Evolution of entanglement of two-photon process in the two-mode coherent state field interacting with an atom via intensity-dependent coupling

作　　者：赵明卓[1] 刘小娟[1] 刘一曼[1] 

机构地区：[1]湖南科技大学物理学院,湘潭411201

出　　处：《原子与分子物理学报》2010年第6期1141-1149,共9页Journal of Atomic and Molecular Physics

基　　金：国家自然科学基金(10374025);湖南省自然科学基金(09JJ3012;10JJ9002);河南省教育厅重点项目(10A032)

摘　　要：分别应用量子约化熵和量子相对熵研究了双模相干光场与原子依赖强度耦合双光子过程中原子与光场之间及光场的双模之间纠缠演化.结果表明,通过选择系统初态参数、控制原子与光场的作用时间,可以调控原子与光场间的纠缠和光场的模间纠缠.可增加或减弱双模相干光场间纠缠,但无法使双模相干光场完全退纠缠.强场条件下,可周期性获得光场与原子的EPR态和可分离态.In the process of a two-mode coherent state field interacting with an atom via intensity-dependent coupling, the evolution of entanglement between the atom and field or between the two-mode field is investigated by using quantum reduced entropy and relative entropy respectively. The results show that we can regulate the above mentioned two kinds of entanglement by choosing the system parameters of the initial state, or controlling the action time between the atom and field. The entanglement of the twomode field will increase or decrease, but it＇s impossible to disentangle completely. We can get the EPR state and the separable state between the field and atom periodically in the high field conditions（the aver- age photon number of the field is very large）.

关 键 词：二能级原子 双模相干态 依赖强度耦合 量子纠缠 

分 类 号：O431.2[机械工程—光学工程]