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