位相算符幺正性的物理考虑  

Physical Consideration of the Unitarity of Phase Operator

作　　者：李春芳[1,2] 苏大春[1,2] 

机构地区：[1]上海大学理学院物理系 [2]山西大学物理系

出　　处：《量子光学学报》1996年第4期224-229,共6页Journal of Quantum Optics

摘　　要：众所周知，引入量子电磁场的位相算符所遇到的困难已经有很长时间了。本文指出，由于真空态｜０＞所对应的消灭算符α的零本征值无幅角的概念，因此任一量子态｜Ψ＞的位相性质应由态（１－｜０＞＜０｜）｜Ψ＞决定。The difficulties in introducing a natural phase opertor in quantum electromagnetic field have been well know for some time. It is pointed out in this paper that the phase properties of any quantum state |Ψ> should be determined by state (1-|0><0|)Ψ> because of the fact that the zero eigen value of the annihilation operator α that corresponds to the vacuum state |0> has no argument. In this sense, Susskind and Glogower′s exponential phase operator is unitary.

关 键 词：位相算符 幺正性 量子电磁场 

分 类 号：O413[理学—理论物理]