Decoherence in phase-preserving linear dissipative processes

Decoherence of nonclassicality and entanglement of bosonic states in phase-preserving linear dissipative processes is investigated by means of the time-convolutionless quantum master equation. It is shown that the sufficient condition for phase-preserving linear dissipative processes to completely destruct nonclassicality and entanglement is that the average value of the noise photon number per unit gain is no less than unity.