多光子Jaynes-Cummings模型中原子与Glauber-Lachs场态相互作用的量子纠缠  

Entanglement of an Atom Interacting with Glauber-Lachs State in Multiphoton Jaynes-Cummings Model

作　　者：冯川[1] 萨楚尔夫[1,2] 李红星[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：《光学学报》2013年第5期264-271,共8页Acta Optica Sinica

基　　金：内蒙古自然科学基金项目(2013MS0112);内蒙古师范大学"十百千"人才工程基金项目资助课题

摘　　要：利用全量子理论,研究了多光子Jaynes-Cummings模型中混合态原子与Glauber-Lachs态相互作用系统的量子纠缠特性,讨论了相干平均光子数、热平均光子数、原子初态和跃迁光子数对系统纠缠特性的影响。结果表明,系统的纠缠度是相干平均光子数、热平均光子数的非单调函数;随着跃迁光子数的增加,系统的纠缠度的振荡频率明显增加,系统的平均纠缠度有减小趋势;原子初态对系统的纠缠度有明显影响,原子初态虽然趋于基态和趋于激发态的程度相同,但对系统的平均纠缠度的影响是不同的;原子初态的混合程度越大,跃迁光子数对系统的平均纠缠度的破坏作用越明显。The entanglement properties of an atom interacting with Glauber-Lachs state in multiphoton JaynesCummings model are studied by means of full quantum theory. The influences of the mean number of coherent photons, the mean number of thermal photons, the number of transition photons and the atomic initial state on the entanglement properties of the system are discussed. Results indicate that the entanglement is a non-monotonic function of the mean number of coherent photons and the mean number of thermal photons. With the increasing of the number of transition photons, the oscillation frequency of the entanglement degree of the system increases obviously and the average entanglement degree of the system decreases. And the atomic initial state affects the entanglement degree of the system obviously. Although the mixedness degree of atomic initial state tend to the ground state and to the excited state are identical, the effects on average entanglement of the system are different. The higher the degree of initial mixedness of the atom is, the more obvious the influence on entanglement degree of the system by the number of transition photons will be.

关 键 词：量子光学 量子纠缠 Glauber-Lachs态 混合态原子 平均纠缠度 

分 类 号：O431.2[机械工程—光学工程]