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Chin. Phys. B, 2010, Vol. 19(3): 034206    DOI: 10.1088/1674-1056/19/3/034206

Quantum fluctuation in excited states of mesoscopic LC circuits at finite temperature

Wang Ji-Suo(王继锁), Fan Hong-Yi(范洪义), and Meng Xiang-Guo(孟祥国)
Department of Physics, Liaocheng University, Shandong 252059, China
Abstract  We discuss quantum fluctuation in excited states (named thermo number states) of mesoscopic LC circuits at a finite temperature. By introducing the coherent thermo state into the thermo field dynamics pioneered by Umezawa and using the natural representation of thermo squeezing operator we can concisely derive the fluctuation. The result shows that the noise becomes larger when either temperature or the excitation number increases.
Keywords:  quantization of LC circuits at finite temperature      coherent thermo state representation      thermo number state      thermo field dynamics  
Received:  25 February 2009      Revised:  30 July 2009      Accepted manuscript online: 
PACS:  42.50.Lc (Quantum fluctuations, quantum noise, and quantum jumps)  
  42.50.Dv (Quantum state engineering and measurements)  
Fund: Project supported by the National Natural Science Foundation of China (Grant Nos. 10574060 and 10775097), the Natural Science Foundation of Shandong Province of China (Grant No. Y2008A23) and the Shandong Province Higher Educational Science and Technology Program (Grant No. J09LA07).

Cite this article: 

Wang Ji-Suo(王继锁), Fan Hong-Yi(范洪义), and Meng Xiang-Guo(孟祥国) Quantum fluctuation in excited states of mesoscopic LC circuits at finite temperature 2010 Chin. Phys. B 19 034206

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