Dissipative dynamics of nondegenerate two-photon Jaynes-Cummings model
  A nondegenerate two-photon Jaynes-Cummings model is investigated where the leakage of photon through the cavity is taken into account. The effect of cavity damping on the mean photon number, atomic populations, field statistics and both field and atomic squeezing is considered on the basis of master equation in dressed-state approximation for initial coherent fields and excited atom. 
E.K. Bashkirov, M.S. Rusakova