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

Bibliographic description

title:	Two-mode squeezed vacuum state coupled to the common thermal reservoir
author:	Prauzner-Bechcicki Jakub
journal title:	Journal of Physics. A, Mathematical and Theoretical
volume:	37
issue:	15
date of publication :	2004
article ID:	L173
ISSN:	1751-8113
eISSN:	1751-8121
DOI:	10.1088/0305-4470/37/15/L04
language:	English
journal language:	English
abstract in English:	Entangled states play a crucial role in quantum information protocols, thus the dynamical behaviour of entanglement is of great importance. In this letter, 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. To quantify entanglement we use the logarithmic negativity. We derive a condition, which assures that the state remains entangled in spite of the interaction with the reservoir. Moreover for the case of interaction with vacuum as an environment we show that a state of interest after infinitely long interaction is not only entangled, but also pure. For comparison we also consider a model in which each mode is coupled to its own reservoir.
affiliation:	Wydział Fizyki, Astronomii i Informatyki Stosowanej : Instytut Fizyki im. Mariana Smoluchowskiego
type:	journal article
subtype:	academic paper

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