运动原子和不同初始场相互作用系统中熵和纠缠的研究(英文)  

Entropy and Entanglement of a Moving Atom Interacting with Different Initial Fields

作　　者：廖庆洪[1,2,3] 鄢秋荣[1] 刘晔[1] Muhammad Ashfaq Ahmad 

机构地区：[1]南昌大学电子信息工程系,南昌330031 [2]南昌大学材料科学与工程学院,南昌330031 [3]北京师范大学射线束技术与材料改性教育部重点实验室,北京100875 [4]COMSATS信息技术学院物理系

出　　处：《光子学报》2013年第10期1248-1255,共8页Acta Photonica Sinica

基　　金：Project supported by the National Natural Science Foundation of China(Nos.11247213,10664002,11264030,61368002);China Postdoctoral Science Foundation(No.2013M531558);the Natural Science Foundation of Jiangxi Province(No.20122BAB201031);the Foundation for Young Scientists of Jiangxi Province(Jinggang Star)(No.2012BCB23002);the Research Foundation of the Education Department of Jiangxi Province(Nos.GJJ12137,GJJ13051,GJJ13057);Jiangxi Postdoctoral Research Project(No.2013KY33)

摘　　要：通过计算线性熵研究了当场初始处于薛定谔猫态和压缩相干态时Jaynes-Cummings模型中原子线性熵随时间的演化特性,讨论了原子运动和场模结构参数对原子线性熵的影响.结果发现原子和场之间的纠缠对压缩参数非常敏感,并且结果表明当腔场初始处于Yurke-Stoler态时,原子的运动导致了线性熵的周期性演化,随着场模结构参数的增加,不但线性熵的演化周期缩短,而且线性熵的的幅值减小.当腔场初始处于偶相干态时,场模结构参数的增加导致了线性熵的演化周期缩短,然而对线性熵的幅值没有影响.The effects of the atomic motion and the field-mode structure,on the evolution of the linear entropy of the atom were examined in the Jaynes-Cummings model by means of linear entropy when the field was initially prepared in Schrodinger cat state and squeezed coherent state.It was found that the degree of entanglement between the atom and the field is very sensitive to the squeezing parameter.It was shown that the atomic motion leads to the periodic evolution of the linear entropy and an increase in field-mode structure parameter results in shortening of the evolution period of the linear entropy and decreasing in the amplitude of the linear entropy when the field is initially in Yurke-Stoler state.Furthermore,the increase of field-mode structure parameter leads to the shortening of the evolution periodicity of the linear entropy,but has no effect on the amplitude of the linear entropy when the field is initially in even coherent state.

关 键 词：线性熵 原子运动 薛定谔猫态 压缩相干态 

分 类 号：O431.2[机械工程—光学工程]