量子Dicke模型中纠缠与自旋压缩性质的研究  

The properties of entanglement and spin squeezing in the quantum Dicke model

作　　者：宋立军[1] 严冬[2] 李永大[1] 蒲忠胜[3] 

机构地区：[1]长春理工大学理学院,吉林长春130022 [2]长春大学应用物理研究所,吉林长春130022 [3]兰州理工大学理学院,甘肃兰州730050

出　　处：《东北师大学报（自然科学版）》2007年第3期46-49,共4页Journal of Northeast Normal University(Natural Science Edition)

基　　金：国家自然科学基金资助项目(40674059);吉林省科技发展计划项目(2006095)

摘　　要：在经典极限条件下,量子化的Dicke模型表现为混沌动力学特征.通过研究量子纠缠和量子自旋压缩特性,得到以下结论:线性熵对于初态函数的选择,在相空间的不同区域有不同的表现,混沌区域的量子纠缠明显增大,规则区域则减弱;量子自旋压缩在相空间也表现出对混沌和规则区域的敏感性,混沌区域与规则区域相比较,存在自旋压缩的可能性较大;相同条件下,线性熵和压缩系数的变化趋势具有相似的表现行为.　A quantum dicke model exhibits chaotic dynamic characters with the classical limit.By studying the quantum entanglement and quantum spin squeezing,such results are obtained ：linear entropy that measuring the power of quantum entanglement,according to different initial states which corresponding to the different regions in phase space,have different behaviors： the power of quantum entanglement strengthen in the chaotic regions obviously and it is weak in the regular regions by contraries;the spin squeezing express difference between regular and chaotic regions in phase space,and the little probabilities of existing spin squeezing are in the regular regions absolutely.In the same conditions,there are exactly similar varieties of the linear entropies and the squeezing parameters.

关 键 词：量子混沌 自旋压缩 纠缠 

分 类 号：O422[理学—声学]