Degradation of continuous variable entanglement in a phase-sensitive environment

The propagation of a twin-beam state of radiation through Gaussian phase-sensitive channels, i.e. noisy channels with squeezed fluctuations is addressed. It is found that squeezing the environment always reduces the survival time of entanglement in comparison to the case of simple dissipation and thermal noise. It is also shown that the survival time is further reduced if the squeezing phase of the fluctuations is different from the twin-beam phase.