%0 Journal Article
%T STATISTICAL ANGLE OF QUANTUM MIXED STATES<br>量子混合态的统计角
%A ZHU DONG-PEI
%A WANG REN-CHUAN
%A WANG GUI-XING
%A <br>朱栋培
%A 王桂星
%A 王仁川
%J 物理学报
%D 1992
%I 
%X The statistical angle between quantum pure stages has been generalized to quantum mixed states. For the case of a single mixed state, it leads to a concept of divergence angle. A criterion for pure state is obtained. In the quantum measurement the information function is the squared cosine of statistical angle between the quantum system and the instrument. The entropy increase during the measurement process appears to be the expanding of the divergence angle.
%K 量子
%K 混合态
%K 发散角
%K 统计角
%K 纯态
%U http://www.alljournals.cn/get_abstract_url.aspx?pcid=6E709DC38FA1D09A4B578DD0906875B5B44D4D294832BB8E&cid=47EA7CFDDEBB28E0&jid=29DF2CB55EF687E7EFA80DFD4B978260&aid=AB61A61A08514D3A346F3B388790DE22&yid=F53A2717BDB04D52&vid=2001E0D53B7B80EC&iid=E158A972A605785F&sid=BA305A52E2EE9350&eid=811ACA5D3673A764&journal_id=1000-3290&journal_name=物理学报&referenced_num=0&reference_num=1