Entropy squeezing of a driven two-level atom in a cavity with injected squeezed vacuum

We derive, the time-dependent solution of the effective master equation for the reduced density matrix operator of a strongly driven atom coupled to a frequency-tunable cavity and damped by a squeezed vacuum. The effects of different parameters on the entropy squeezing factors, the variance squeezing and population inversion of such an atom emitted from the cavity, are discussed.