| Abstract: | We study entanglement properties of two-mode
squeezed thermal states subjected to two sources of decoherence: the
common reservoirs and the bosonic memory Gaussian channel. For the
former one, we find that there exist three different behaviors:
no-sudden death, sudden death, and no-creation of entanglement. The
range of parameters characterizing these processes is obtained. For
the latter one, we obtain a threshold in the degree of squeezing
above which the input states remain always entangled. Otherwise, no
entanglement is allowed in bosonic Gaussian channel with memory
effect. We show that a degree of memory for quantum channel can be
help to increase the initial entanglement, while the mean number of
added thermal photons is to fasten the decoherence
process. |
