EPJ Web Conf.
Volume 226, 2020Mathematical Modeling and Computational Physics 2019 (MMCP 2019)
|Number of page(s)||8|
|Section||Plenary and Invited Lectures|
|Published online||20 January 2020|
Coherence Dynamics of Two Interacting Bosonic Modes in a Thermal Environment
Department of Theoretical Physics, National Institute of Physics and Nuclear Engineering,
2 Faculty of Physics, University of Bucharest, 077125 Bucharest-Magurele, Romania
3 Academy of Romanian Scientists, 3 Ilfov str., 050044 Bucharest, Romania
★ e-mail: email@example.com
Published online: 20 January 2020
We describe the time evolution of the quantum coherence in an open system consisting of two coupled bosonic modes embedded in a thermal reservoir. We discuss the influence of the environment in terms of the covariance matrix for initial squeezed thermal states. The coherence is quantified using the relative entropy as a measure, and its dynamics is studied in the framework of the theory of open systems based on completely positive quantum dynamical semigroups. We show that the evolution of the quantum coherence strongly depends on the initial state of the system (squeezing parameter and thermal photon numbers), the parameters characterizing the thermal reservoir (temperature and dissipation coefficient) and the intensity of the coupling between the two modes.
© The Authors, published by EDP Sciences, 2020
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