Bell态原子与双模奇偶纠缠相干光场相互作用的纠缠特性  

Entanglement properties in the system of atoms in Bell states interacting with the two-mode odd-even entangled coherent field

作　　者：邹艳[1,2] 

机构地区：[1]德州学院物理系,山东德州253023 [2]山东省高校生物物理重点实验室,山东德州253023

出　　处：《量子电子学报》2009年第1期69-75,共7页Chinese Journal of Quantum Electronics

基　　金：德州学院科研基金(07024)资助项目

摘　　要：运用全量子理论和数值计算的方法,借助于Negativity研究了Bell态原子与双模奇偶纠缠相干光场相互作用系统中两个全同二能级原子之间的纠缠演化特性。分析了光场强度、光场纠缠度及原子间相互作用强度对纠缠的影响。结果表明:原子初态处于|β_(11)〉时,两原子始终处于最大纠缠态;原子初态处于|β_(00)〉时,两原子始终较长时间处于退纠缠状态;原子处在|β_(10)〉时,增大双模光场的平均光子数可以明显增大两原子之间的纠缠度并保持较大的纠缠状态;原子初态处在|β_(01)〉时,原子间的相互作用强度对双原子间纠缠度有较显著的非线性调制作用。By means of the quantum theory and numerical calculations method, the entanglement time evolution of the two identical two-level atoms in Bell states interacting with the two-mode odd-even entangled coherent field is investigated by using Negativity. The effects of the atoms initial state, mean photon numbers of field, the degree of the entanglement for the entangled coherent fields, and the coupling strength of interaction between atoms on the Negativity axe discussed. The results show that the two-atom entanglement state will forever stay in the maximum entangled state when the initial state is ｜β11〉, while the Bell state ｜β00〉 atoms appear disentanglement most of the scaled time. For the state ｜β10〉, mean photon numbers of field can be a great help, and in the state ｜β01〉 the coupling strength of interaction between atoms plays a major role in the two-atom entanglement.

关 键 词：量子光学 量子纠缠 NEGATIVITY BELL态 双模奇偶纠缠相干光场 

分 类 号：O431.2[机械工程—光学工程]