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.
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Xiang, S.H., Song, K.H., Wen, W. et al. Entanglement behaviors of two-mode squeezed thermal states in two different environments. Eur. Phys. J. D 62, 289–296 (2011). https://doi.org/10.1140/epjd/e2011-10546-1
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DOI: https://doi.org/10.1140/epjd/e2011-10546-1