量子电子学报, 2009, 26 (2): 223, 网络出版: 2010-05-24
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
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 quantume optics binomial light field a cascade three-level atom high-Q cavity with Kerr medium field entropy quantum entanglement
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。
Abstract
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.
郭云香, 王青狮, 赖云忠. 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[J]. 量子电子学报, 2009, 26(2): 223. GUO Yun-xiang, WANG Qing-shi, LAI Yun-zhong. Entropy evolution of field in system of cascade three-level atom interacting with binomial field in a Kerr-like medium[J]. Chinese Journal of Quantum Electronics, 2009, 26(2): 223.