辐射场的量子熵(英文)

Quantum entropy of radiation fields

阐述熵的深刻涵义,对混合态的量子系统,建立计算熵函数的一般方法,并用其计算典型辐射场的量子熵.结果显示,量子熵关联到辐射场的微观起伏,因而能描述其量子相干性.显示了一个典型的耗散量子系统的熵演化特征.指出量子熵的研究方法和结果,有望用于量子光学、量子信息学、生物光子学及相关交叉学科领域.

Based on the elucidation for definition of entropy,we present a general method for calculating entropy of a quantum system in mixed state and apply it to the radiation fields in the typically mixed states.The results demonstrate that the quantum entropy is correlated to the microscopic fluctuation of the radiation fields,and it may therefore describe the quantum coherence properties of the radiation fields.As an example,the evolution of entropy of a dissipative quantum system is investigated then.The results obtained in this paper are expected to provide a basis for applications of entropy method in some fields,such as quantum optics,quantum informatics,biophotonics,and related interdisciplinary science.