两原子与数态场相互作用系统中纠缠的调控  

Control of the Entanglement Between the Two Atoms Interacting with a Fock State Field

作　　者：廖庆洪[1] 刘晔[1] 

机构地区：[1]南昌大学电子信息工程系,江西南昌330031

出　　处：《光学学报》2012年第3期295-299,共5页Acta Optica Sinica

基　　金：国家自然科学基金(10647133);江西省自然科学基金(2009GQS0080);江西省教育厅科技项目(GJJ11339)资助课题

摘　　要：通过计算并发度研究了两个处于初始激发态的两能级原子与数态场相互作用系统的纠缠动力学特性,并讨论了场的光子数、原子和场的失谐量以及原子操作对并发度的影响。结果表明当不存在原子操作时,两原子之间的纠缠出现突然产生现象,并且可以通过调节光子数和原子与场的失谐量来控制产生纠缠的阈值时间和纠缠的最大值。当存在原子操作时,两原子之间的纠缠随着时间的演化可以立即产生,而且通过对经典场的操作和控制可以实现两原子之间纠缠的调控。The dynamics of entanglement of two two-level atoms initially in excited state interacting with a Fock state field is examined by means of concurrence. The effects of photon number, atom-cavity detuning and manipulation of the atom on the time evolution of concurrence are investigated. The results show that the phenomenon of sudden birth of entanglement between two atoms occurs in the absence of the manipulation of the atom. Moreover, the threshold time for the creation of entanglement and the maximum of the entanglement can be controlled by the photon number and the atom-cavity detuning. The entanglement between two atoms can be created immediately as time develops in the presence of manipulation of the atom. The atom-atom entanglement can be manipulated by the application of the classical field.

关 键 词：量子光学 量子纠缠 并发度 纠缠调控 

分 类 号：O431.2[机械工程—光学工程]