%0 Journal Article
%T The research of properties of the quantum conditonal amplitude operator<br>量子条件振幅算子性质的研究
%A Zhang
%A De-Xing
%A <br>张德兴
%J 物理学报
%D 2004
%I 
%X This paper analyzes the properties of the quantum conditional amplitude operator.This operator plays a role similar to that of the conditional probability in classical information theory.One argues that the spectrum of the conditional operator that characterizes a quantum bipartite system is invariant under local unitary transformations,and shows its inseparability.It is proven that the conditional amplitude operator of a separable state cannot have an eigenvalue exceeding unity.A related separability condition based on the non negativity of the von Neumann conditional entropy is obtained.
%K conditional probability
%K conditional amplitude operator
%K von Neumann conditional entropy
%K condition for separability<br>条件概率
%K 条件振幅算子
%K von
%K Neumann条件熵
%K 可分性条件
%U http://www.alljournals.cn/get_abstract_url.aspx?pcid=6E709DC38FA1D09A4B578DD0906875B5B44D4D294832BB8E&cid=47EA7CFDDEBB28E0&jid=29DF2CB55EF687E7EFA80DFD4B978260&aid=B66D2728A2C3F398&yid=D0E58B75BFD8E51C&vid=8E6AB9C3EBAAE921&iid=B31275AF3241DB2D&sid=3C4387F16C0A0126&eid=1CF15D8E59774A81&journal_id=1000-3290&journal_name=物理学报&referenced_num=0&reference_num=10