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UNIVERSITY OF BUCHAREST
FACULTY OF PHYSICS Guest
2024-11-27 9:29 |
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Conference: Bucharest University Faculty of Physics 2017 Meeting
Section: Theoretical Physics and Applied Mathematics
Title:
Gaussian quantum steering of two bosonic modes in a squeezed thermal environment
Authors:
Tatiana MIHAESCU (1,2), Aurelian ISAR (2)
*
Affiliation:
1) University of Bucharest, Faculty of Physics
2) IFIN HH, DFT
E-mail
mihaescu92tatiana@gmail.com
Keywords:
Gaussian states, quantum steering, squeezed thermal environment.
Abstract:
Einstein-Podolsky-Rosen steerability of quantum states is a property that is different from entanglement and Bell nonlocality. We describe the time evolution of a recently introduced measure that quantifies steerability for arbitrary bipartite Gaussian states in a system consisting of two bosonic modes embedded in a common squeezed thermal environment. We work in the framework of the theory of open systems. If the initial state of the subsystem is taken of Gaussian form, then the evolution under completely positive quantum dynamical semigroups assures the preservation in time of the Gaussian form of the states. It was shown that the thermal noise and dissipation introduced by the thermal environment destroy the steerability between the two bosonic modes. In the case of the squeezed thermal bath we show the dependence of the Gaussian steering on the squeezing parameters of the bath and of the initial state of the system. A comparison with other quantum correlations for the same system shows that, unlike Gaussian quantum discord, which is decreasing asymptotically in time, the Gaussian quantum steerability suffers a sudden death behaviour, like quantum entanglement.
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