隧穿量子点分子模型与光场相互作用的熵特性  

Entropy properties of a tunneling quantum dot molecule model interacting with a cavity field

作　　者：周青春[1] 曾小祥[1] 张先寒[1] 

机构地区：[1]江苏科技大学数理学院,江苏镇江212003

出　　处：《江苏科技大学学报（自然科学版）》2009年第3期278-282,共5页Journal of Jiangsu University of Science and Technology:Natural Science Edition

摘　　要：用全量子论研究了微腔中量子化光场与隧穿量子点分子模型相互作用系统的熵特性,导出了量子点系统熵(场熵)的计算公式,讨论了不同的初始光场对量子点系统熵(场熵)的影响。结果表明:初始光场处在相干态情况下,随着失谐量Δ的增大,场熵的周期明显加强,但场熵的均值却不断减小,这表明失谐量的增加,导致光场与量子点分子的关联减弱,即耦合程度降低;在初始光场为压缩真空态的情况下,其结论与初始光场为相干态情况下的结论相似。In this paper, a full quantum theory was applied to the investigation of the entropy properties of the field interacting with a quantum dot molecule tunneling model in a microcavity, the formula of the quantum dot system entropy （field entropy） was derived, and the influence of different initial field states on the quantum dot system entropy （field entropy） was discussed. The results show that when the initial field is a coherent state, the periodicity of the field entropy strengthens obviously, but the mean value of the field entropy gradually decreases with the detuning A increasing, which shows that the increasing of the detuning causes the connection of the field with the quantum dot molecule to weaken, namely the degree of coupling decreases. However, those conclusions are drawn when the initial field is a squeezed vacuum state. This is similar with the results that the initial field is a coherent state.

关 键 词：量子点 冯·诺伊曼熵 场态 

分 类 号：O431.2[机械工程—光学工程]