有限温度下介观无损耗传输线中电流的量子涨落  

Quantum fluctuations of current in a mesoscopic lossless transmission line at finite temperature

作　　者：汪仲清[1] 李俊红[1] 安广雷[1] 

机构地区：[1]重庆邮电学院光电工程学院

出　　处：《量子电子学报》2005年第6期900-906,共7页Chinese Journal of Quantum Electronics

基　　金：国家自然科学基金资助项目(10474092)

摘　　要：利用热场动力学的方法研究了介观无损耗传输线中电流在具有热噪声的真空态、相干态和压缩态下 的量子涨落。得到了有限温度下介观无损耗传输线中电流的量子涨落与温度的关系。结果表明,介观无损耗传 输线中电流的量子涨落不仅与电路的参数有关,还与传输线所处的环境温度有关。温度越高,介观无损耗传输 线中的量子噪声越大。By making use of thermo-field dynamics （TFD）, the quantum fluctuations of current of the mesoscopic lossless transmission line in the vacuum state, the coherent states and the squeezed states with thermal noise have been studied. Thus the dependence of the fluctuations on temperature in these states at finite temperature can be seen. It is shown that the quantum fluctuations depend on not onh- the parameters of the transmission line but also the environmental temperature T. The higher the temperature, the more quantum noise the line exhibits.

关 键 词：量子光学 无损耗传输线 热相干态 热压缩态 量子涨落 

分 类 号：O431.2[机械工程—光学工程] TN751.1[理学—光学]