S. Boixo et al 2007 EPL 79 40003 doi:10.1209/0295-5075/79/40003
S. Boixo1,2, L. Viola3 and G. Ortiz4
Show affiliationsWe investigate the connection between quasi-classical (pointer) states and generalized coherent states (GCSs) within an algebraic approach to Markovian quantum systems (including bosons, spins, and fermions). We establish conditions for the GCS set to become most robust by relating the rate of purity loss to an invariant measure of uncertainty derived from quantum Fisher information. We find that, for damped bosonic modes, the stability of canonical coherent states is confirmed in a variety of scenarios, while for systems described by (compact) Lie algebras, stringent symmetry constraints must be obeyed for the GCS set to be preferred. The relationship between GCSs, minimum-uncertainty states, and decoherence-free subspaces is also elucidated.
03.67.Pp Quantum error correction and other methods for protection against decoherence
05.30.-d Quantum statistical mechanics
03.65.Yz Decoherence; open systems; quantum statistical methods
Quantum gases, liquids and solids
Issue 4 (August 2007)
Received 6 June 2007, accepted for publication 25 June 2007
Published 19 July 2007
S. Boixo et al 2007 EPL 79 40003
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