Issue |
EPL
Volume 99, Number 2, July 2012
|
|
---|---|---|
Article Number | 20012 | |
Number of page(s) | 6 | |
Section | General | |
DOI | https://doi.org/10.1209/0295-5075/99/20012 | |
Published online | 30 July 2012 |
Liouville coherent states
Department of Physics, University of Fribourg - Chemin du Musée 3, 1700 Fribourg, Switzerland
Received: 14 May 2012
Accepted: 30 June 2012
For a certain class of open quantum systems there exists a dynamical symmetry which connects different time-evolved density matrices. We show how to use this symmetry for dynamics in the Liouville space with time-dependent parameters. This allows us to introduce a concept of generalized coherent states in the Liouville space (i.e., for density matrices). The dynamics of this class of density matrices is characterized by robustness with respect to any time-dependent perturbations of the couplings. We study their dynamical context while focusing on common physical situations corresponding to compact and non-compact symmetries.
PACS: 03.65.Yz – Decoherence; open systems; quantum statistical methods / 03.65.Fd – Algebraic methods
© EPLA, 2012
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