压缩真空场与运动二能级原子相互作用的量子纠缠  

Quantum entanglement in the interaction between squeezing vacuum state field and moving two-level atom

作　　者：曾明生[1] 谢芳森[1] 江辉明[1] 

机构地区：[1]江西师范大学物理与通信电子学院,江西南昌330027

出　　处：《量子电子学报》2006年第5期647-651,共5页Chinese Journal of Quantum Electronics

基　　金：江西省自然科学基金资助项目(0312017)

摘　　要：用Von Neuman熵研究了压缩真空场与运动二能级原子相互作用的量子体系的量子纠缠特性,讨论了初始压缩真空场的压缩度以及运动原子的场模结构参数对该量子体系纠缠特性的影响。结果表明,原子的运动使系统纠缠度的演化具有严格的周期性;在初始压缩度较大(r>3)时,除了一些消纠缠点外,系统将长久停留在最大纠缠态,场模结构参数的增大将导致消纠缠次数的增多。The properties of the entanglement between squeezing vacuum state field and moving two-level atom are investigated by using the von Neumann entropy. The influences of field-mode structure of moving two-level atom and the squeezing degree of initial squeezing vacuum state field on the entanglement of the quantum system are discussed. The results show that atomic movement can result in evolution periodically of the degree of entanglement. The quantum state will be maximally entangled state for a long time when the squeezing degree are high, the increase of field-mode structure result in more disentangled states.

关 键 词：量子光学 量子纠缠 运动二能级原子 压缩真空态 场模结构 Von Neuman熵 

分 类 号：O431.2[机械工程—光学工程]