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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 |
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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.
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Received: 25 February 2009
Revised: 30 July 2009
Accepted manuscript online:
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PACS:
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42.50.Lc
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(Quantum fluctuations, quantum noise, and quantum jumps)
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42.50.Dv
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(Quantum state engineering and measurements)
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| 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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