a Department of Physics, Shanghai Jiaotong University, Shanghai 200030, China; b Department of Material Science and Engineering, University of Science and Technology of China, Hefei 230026, China
Abstract Based on thermo field dynamics (TFD) and using the thermo Wigner operator in the thermo entangled state representation we derive the Wigner function of number states at finite temperature (named thermo number states). The figure of Wigner function shows that its shape gets smoothed as the temperature rises, implying that the quantum noise becomes larger.
Received: 27 June 2008
Revised: 27 July 2008
Accepted manuscript online:
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