最优相位协变量子克隆(英文)  

Optimal phase-covariant quantum cloning

作　　者：张刚[1] 潘国柱[2] 袁好[2] 

机构地区：[1]皖西学院机械与电子工程学院,安徽六安237012 [2]皖西学院材料与化工学院,安徽六安237012

出　　处：《量子电子学报》2015年第4期438-444,共7页Chinese Journal of Quantum Electronics

基　　金：National Natural Science Foundation of China(2013CB921804;61370090);Anhui Provincial Natural Science Foundation(1408085MA20)

摘　　要：在量子信息科学中,量子克隆理论是基础理论,它提供量子密码术的绝对安全性。得到d维空间最优1→M=d+1相位协变量子克隆的具体变换,然后将这种克隆机推广到1→M=kd+1(k为整数)情况,并得到具体的变换。利用2维空间非最优2→M=2k+1相位协变量子克隆的形式,得到最优的克隆变换。两种类型的量子克隆机的拷贝忠信度符合已有的理论值。In quantum information science,quantum cloning theory is a basic one that provides an absolute security of quantum cryptography.The explicit transformation of the optimal 1 → M=d＋1phase-covariant quantum cloning in d dimensions was derived and then this kind of cloning machine to the 1→M=kd＋1（for integer k）case was generized and the explicit transformation was obtained.By exploiting the formulation of the nonoptimal 2→M=2k＋1 phase-covariant quantum cloning in 2dimensions,the optimal cloning transformation was derived.The copy fidelities of the two kinds of cloning machines are coincident with the theoretical values found.

关 键 词：量子信息 量子密码术 量子克隆 普适量子克隆 相位协变量子克隆 

分 类 号：O431[机械工程—光学工程]