Wigner functions of thermo number state, photon subtracted and added thermo vacuum state at finite temperature
arXiv:0901.1424 · doi:10.1142/S0217732309030953
Abstract
Based on Takahashi-Umezawa thermo field dynamics and the order-invariance of Weyl ordered operators under similar transformations, we present a new approach to deriving the exact Wigner functions of thermo number state, photon subtracted and added thermo vacuum state. We find that these Wigner functions are related to the Gaussian-Laguerre type functions of temperature, whose statistical properties are then analysed.
10 pages and 2 figures