薛定谔猫态光场与多光子跃迁运动二能级原子相互作用系统的保真度  

Fidelity of Quantum State in a System of a Moving Two-level Atom for Multi-photon Transition Interacting with Schrdinger Cat State Light Field

作　　者：王艳清[1] 萨楚尔夫[1,2] 王亚男[1] 

机构地区：[1]内蒙古师范大学物理与电子信息学院,内蒙古呼和浩特010022 [2]内蒙古师范大学图书馆,内蒙古呼和浩特010022

出　　处：《河北师范大学学报（自然科学版）》2015年第1期32-37,共6页Journal of Hebei Normal University：Natural Science

基　　金：内蒙古自治区自然科学基金(2013MS0115);内蒙古师范大学"十百千"人才基金(RCPY-2-2012-K-038)

摘　　要：利用全量子理论,研究了薛定谔猫态光场与多光子跃迁运动二能级原子相互作用系统的保真度.分别讨论了初始光强、原子运动速度、跃迁光子数以及薛定谔猫态中两宏观相干态的相位角等物理参量对系统保真度的影响.结果表明:随着初始光强的增大,量子态保真效果越来越差;当初始光强增大到一定程度时,偶相干态和奇相干态的保真度与时间演化特性相同;当跃迁光子数为奇数时,原子运动速度的增大使量子态保真效果更好.The fidelity evolution in a system which is composed of a multi-photon transition moving two-level atom interacting with the Schrdinger cat state lighe field is studied by means of the full quantum theory.The influences of the strength of light field,the phase angle between the two coherent states,the atomic motion and the number of transition photon on the fidelity in a system are discussed.The results show that with increasing in the strength of light,the value of the fidelity is decreased.When the strength of light field is large enough,the fidelity of even coherent state and odd coherent state becomes equal,and the properties of fidelity evolvement are also the same.When the transitional photon number is odd,the fidelity of quantum state will be better with increasing in the velocity of atomic motion.

关 键 词：量子光学 量子态保真度 薛定谔猫态光场 二能级原子 多光子跃迁 

分 类 号：O431.2[机械工程—光学工程]