Two-mode squeezed vacuum state coupled to the common thermal reservoir

Entangled states play a crucial role in quantum information protocols, thus the dynamical behavior of entanglement is of a great importance. In this paper we consider a two-mode squeezed vacuum state coupled to one thermal reservoir as a model of an entangled state embedded in an environment. As a criterion for entanglement we use a continuous-variable equivalent of the Peres-Horodecki criterion, namely the Simon criterion. We derive a condition, which assures that the state remains entangled in spite of the interaction with the reservoir.

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