摘要
讨论了n维量子系统中纯态的一种量子克隆机.建立了量子克隆机可精确克隆量子态的充要条件.提出了3个纠缠指数Dabc(1),Dabc(2),Dabc(3)与克隆质量指数Da,并给出了它们之间的不等式关系.最后,证明了纠缠指数Dabc(1),Dabc(2),Dabc(3)之间的不等式关系.
A quantum cloning machine for general pure states of in an n dimensional quantum system is proposed and discussed. First,a necessary and sufficient condition for a pure state to be cloned accurately is given. Second,the three entanglement indexesDabc(1),Dabc(2),Dabc(3) of the output state and the index of clo- ning quality Da of the input state are introduced,the inequality relations between them are established. Finally,some inequality relations on the indices Dabc(1),Dabc(2),Dabc(3) are proved.
出处
《纺织高校基础科学学报》
CAS
2012年第4期448-455,共8页
Basic Sciences Journal of Textile Universities
基金
国家自然科学基金资助项目(10871224
11171197)
关键词
量子克隆
量子态
量子纠缠
纠缠指数
克隆质量指数
quantum cloning quantum state quantum entanglement index of entanglement index of clo-ning quality