Maximum confidence measurements via probabilistic quantum cloning  

作　　者：张文海 余龙宝 曹卓良 叶柳 

机构地区：[1]Department of Physics,Huainan Normal University [2]Department of Physics and Electronic Engineering,Hefei Teachers College [3]School of Physics and Material Science,Anhui University

出　　处：《Chinese Physics B》2013年第3期169-172,共4页中国物理B（英文版）

基　　金：Project supported by the National Natural Science Foundation of China (Grant Nos. 11074002,61073048,and 11104057);the Natural Science Foundation of the Education Department of Anhui Province,China (Grant Nos. KJ2010ZD08 and KJ2012A245);the Postgraduate Program of Huainan Normal University of China

摘　　要：Probabilistic quantum cloning（PQC） cannot copy a set of linearly dependent quantum states.In this paper,we show that if incorrect copies are allowed to be produced,linearly dependent quantum states may also be cloned by the PQC.By exploiting this kind of PQC to clone a special set of three linearly dependent quantum states,we derive the upper bound of the maximum confidence measure of a set.An explicit transformation of the maximum confidence measure is presented.Probabilistic quantum cloning（PQC） cannot copy a set of linearly dependent quantum states.In this paper,we show that if incorrect copies are allowed to be produced,linearly dependent quantum states may also be cloned by the PQC.By exploiting this kind of PQC to clone a special set of three linearly dependent quantum states,we derive the upper bound of the maximum confidence measure of a set.An explicit transformation of the maximum confidence measure is presented.

关 键 词：probabilistic quantum cloning quantum state discrimination maximum confidence measurement 

分 类 号：O413.1[理学—理论物理]