Kerr介质中二项式光场与级联三能级原子相互作用的场熵演化  

Entropy evolution of field in system of cascade three-level atom interacting with binomial field in a Kerr-like medium

作　　者：郭云香[1] 王青狮[1] 赖云忠[1] 

机构地区：[1]太原科技大学物理系,陕西太原030024

出　　处：《量子电子学报》2009年第2期223-230,共8页Chinese Journal of Quantum Electronics

摘　　要：研究了在高Q Kerr介质腔中,级联三能级原子与二项式光场相互作用过程中场熵的演化特性。数值计算结果表明:当原子初态处于非相干叠加态时,附加Kerr介质可以提高场熵的值,使原子和光场之间的纠缠程度增强,超过一定值后场熵值反而会降低,纠缠程度减弱,场熵振荡周期变长;当原子初态处于相干叠加态时,附加Kerr介质会降低场熵的值,原子和光场间的纠缠减弱,只有当介质参数达到一定值后才能提高场熵值,增强纠缠,之后的演化规律和原子处于非相干叠加态时一致。The entropy evolution properties of the field in the system of a cascade three-level atom interacting with binomial field in a Kerr-like medium is studied. By numerical method, the results indicate when the atom initially in excited states, the field entropy increases with the increasing of Kerr coefficient, the quantum entanglement is improved too. However, the field entropy reduces when the parameter exceeds a certain value and the period of field entropy becomes longer. When the atom initially in levels＇ superposition states, the field entropy reduces with the effect of Kerr effect and the entanglement between atom and optical field becomes lower. The field entropy could be improved unless the parameter exceeds a certain value. Then the law is the same as the case of the atom initially in excited states with the increasing of Kerr coefficient.

关 键 词：量子光学 二项式光场 级联三能级原子 高Q介质腔 场熵 量子纠缠 

分 类 号：O431.2[机械工程—光学工程]