运动原子与薛定谔猫态光场相互作用系统中的量子纠缠  

Quantum Entanglement in An Interacting System of Moving Atom and Schrdinger Cat State

作　　者：李鹏茂 萨楚尔夫[1,2] 苏少龙[1] 

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

出　　处：《内蒙古师范大学学报（自然科学汉文版）》2014年第2期174-179,共6页Journal of Inner Mongolia Normal University(Natural Science Edition)

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

摘　　要：利用代数动力学方法,在多光子跃迁过程的J-C模型中,研究运动原子与薛定谔猫态相互作用系统中的纠缠特性,讨论了原子初始处于基态的几率、原子运动速度、跃迁光子数、初始光场强度、失谐量以及薛定谔猫态中两宏观相干态的相位角等物理参量,对系统纠缠度的影响.数值计算表明,跃迁光子数的奇偶值对系统的纠缠特性有很大影响,跃迁光子数为奇数时,失谐量的变化使系统出现退纠缠现象,原子运动速度的增大使系统纠缠度的变化频率增大,纠缠度减小;跃迁光子数为偶数,原子初始处于基态的几率大于激发态的几率时,系统也会出现退纠缠现象,但原子的运动速度对系统的纠缠特性不产生影响.Entanglement degrees in an interacting system of moving atom and Schr？dinger cat state were studied by using the fully quantum theory and algebraic dynamics in the J-C model.The influence of the probability of atom in the ground,the velocity of atomic motion,the transition photon number,the original strength of the light field,the detuning and the two macroscopic coherent phase angles in the Schr？dinger cat state on the entanglement properties of the system are discussed.The numerical results show that the odd or even transition photon number can produce great influence on the entanglement of the system.As the transition photon number is odd,the quantity of detuning can make the entanglement disap-pear suddenly.The increase of the velocity of atomic motion will make entanglement degrees decrease,and transition frequency becomes faster.When the transition photon number is even,and the probability of atom in the ground state is greater than that of atom in the excited state,it will make the entanglement degrees vanish suddenly.But under the same condition,the velocity of atomic motion will not affect the entanglement properties.

关 键 词：薛定谔猫态 量子纠缠 负熵 

分 类 号：O431.2[机械工程—光学工程]