热场动力学理论中的Husimi分布函数及Wehrl熵的研究  

Husimi function and Wehrl entropy in thermo field dynamics

作　　者：王帅[1] 张丙云[1] 张运海[1] 

机构地区：[1]菏泽学院物理系,菏泽274015

出　　处：《物理学报》2010年第3期1775-1779,共5页Acta Physica Sinica

基　　金：山东省自然科学基金(批准号:Y2008A16);菏泽学院自然科学基金(批准号:XY09WL01)资助的课题~~

摘　　要：利用量子相空间技术和信息熵理论,研究了热场动力学理论中量子纯态与相应混合态的Husimi分布函数及Wehrl熵的一致性问题.结果表明,热相干态与相应混合态的Husimi分布函数及Wehrl熵完全相同,支持了热场动力学理论.且热相干态的Wehrl熵与平移因子无关,故在热相干态中,量子系统的可观测量的量子涨落及不确定关系也与平移因子无关.Using the quantum phase space technique and the information-theory like the Wehrl entropy, the Husimi function and the Wehrl entropy of the quantum pure states and the corresponding mixed states in thermo field dynamics are studied. It is found that the Husimi function and the Wehrl entropy of the thermal coherent state agree with that of the corresponding mixed states. And the Wehrl entropy of thermal coherent state is not related with the displacement factor. Therefore for a quantum system, the quantum fluctuations of the observable quantities and corresponding uncertainty relation are also not related with the displacement factor in the thermal coherent state.

关 键 词：热场动力学理论 Husimi分布函数 WEHRL熵 

分 类 号：O414.11[理学—理论物理]