Rényi2 quantum correlations of twomode Gaussian systems in a thermal environment
Abstract
In the framework of the theory of open systems based on completely positive quantum dynamical semigroups, we provide a description of continuous variable Gaussian Rényi2 (GR2) quantum discord for a system consisting of two noninteracting nonresonant bosonic modes embedded in a thermal environment. In the case of both an entangled initial squeezed vacuum state and a squeezed thermal state, GR2 quantum discord has nonnegative values for all temperatures of the environment. We describe also the time evolution of GR2 classical correlations and GR2 quantum mutual information of the quantum system. All these quantities tend asymptotically to zero in the longtime regime under the effect of the thermal bath.
 Publication:

Physica Scripta
 Pub Date:
 March 2013
 DOI:
 10.1088/00318949/87/03/038108
 arXiv:
 arXiv:1301.0645
 Bibcode:
 2013PhyS...87c8108I
 Keywords:

 Quantum Physics
 EPrint:
 10 pages, 5 figures, Physica Scripta (2013). arXiv admin note: substantial text overlap with arXiv:1301.0549, arXiv:1301.0146