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