量子混合态的统计角  

STATISTICAL ANGLE OF QUANTUM MIXED STATES

作　　者：朱栋培[1] 王桂星 王仁川[2] 

机构地区：[1]中国科学技术大学近代物理系,合肥230026 [2]中国科学技术大学天体物理中心

出　　处：《物理学报》1992年第4期542-549,共8页Acta Physica Sinica

摘　　要：本文把关于量子纯态之间的统计角概念推广到量子混合态,并提出了单个混合态的发散角这一概念,导出了纯态判据,用到测量上,响应函数不过是量子系统与仪器之间的统计角余弦的平方,而测量过程中的熵增加则显现为混合态发散角的扩大。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.

关 键 词：量子 混合态 发散角 统计角 纯态 

分 类 号：O413.1[理学—理论物理]