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We present a microscopic model for a grey body which consists of a blackbody at the temperature T b surrounded by a semitransparent mirror. We derive the density operator of the grey-body radiation in the photon number or Wigner representation. These relations involve the density matrix or the Wigner function of the incident radiation and kernels which contain information about the blackbody...
We present an exact quantum treatment of the generalized model of a degenerate parametric oscillator, in which we allow for self-phase modulation of the signal mode. Using the steady-state solution of the Fokker-Planck equation in the complexP -representation we obtain an exact analytical result for the Wigner quasiprobability distribution function. The obtained Wigner function allows us to give...
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