多粒子纠缠态的量子Fisher信息  

Quantum Fisher information of multi-particle entangled state

作　　者：易洪刚[1] 陈荣华[1] 李嵩松[1] 

机构地区：[1]南昌师范学院物理系,江西南昌330032

出　　处：《激光杂志》2014年第1期10-11,共2页Laser Journal

基　　金：江西省教育厅教改课题资助(JXJG-06-67-12);南昌师范学院博士基金资助

摘　　要：利用量子Fisher信息研究了多粒子纠缠态的纠缠特性,该纠缠态由四个狄克态叠加而成。通过研究叠加系数和相对相位对量子Fisher信息的影响研究多粒子纠缠态的纠缠特性。结果:表明量子Fisher信息是叠加系数的周期函数。但其大小随相对相位和总粒子数变化,相对相越大或位粒子数越多,多粒子纠缠态的纠缠程度越高。The entangled behaviors of a multi-particle entangled state was investigated with quantum Fisher information, where the entangled state is superposed by four Dieke states. The entangled behaviors can be studied by investigating superposition coeffi- cient and relative phase＇ s influence on quantum Fisher information. Its shown that quantum Fisher information is a periodic func-tion of superposition coefficient. The value of quantum Fisher information changes with superposition coefficient and the total number of particles. The more the relative phase or the total number of particles is, the higher the degree of entanglement of the multi-particle entangled state is.

关 键 词：量子Fisher信息 多粒子纠缠态 相对相位 纠缠特性. 

分 类 号：O431.2[机械工程—光学工程]