Simulation of thermal fragility of vacuum squeezing in two photon lossy cavity

In this research, squeezing fragility due to thermal bath, in quantum squeezed state generation, is simulated. For purpose, single mode dissipative cavity with non-zero second-order susceptibility used. Cavity nonlinear medium driving by laser pump known frequency, and pairs of identical photons are created, one-half frequency pump. This process as degenerate parametric down conversion. the absence any dissipation, simulation shows linear time dependent parameter, which agreement theoretical results. two photon loss contact cold reservoir, competition between gain loss, results stable initial vacuum, steady system. At end, has been shown that, omits leads final field mixture Fock states.