Thermodynamics of squeezed states in mesoscopic circuits
Ji Ying-Hua (嵇英华)ab, Luo Hai-Mei (罗海梅)ab, Liu Qing (刘清)a, Lei Min-Sheng (雷敏生)ab
a Department of Physics, Jiangxi Normal University, Nanchang 330027, China; b Key Laboratory of Optoelectronic & Telecommunicationof Jiangxi Province, Nanchang, Jiangxi 330027, China
Abstract Based on information theory, we present a density matrix to discuss coherent and squeezed states for a mesoscopic LC circuit with time-dependent frequency. With the relevant operators included in the density matrix, a connection between the appearance of coherent and squeezed states is established, i.e., the quantum state evolution of system is highly relevant to the initial state. Generally speaking, due to the effect of circumstance temperature, mesoscopic LC circuit will evolve to squeezed state when it initially lies in an excited state. In particular, at a low temperature, step changes of circuit parameters will result in the squeezed minimum uncertainty state if the resonance frequency remains consistent after the change.
Received: 08 November 2004
Revised: 25 January 2005
Accepted manuscript online:
Fund: Project supported by the National Sciencen Foundation of Jiangxi Province, China (Grant No. 0312019)
Cite this article:
Ji Ying-Hua (嵇英华), Luo Hai-Mei (罗海梅), Liu Qing (刘清), Lei Min-Sheng (雷敏生) Thermodynamics of squeezed states in mesoscopic circuits 2005 Chinese Physics 14 1227
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