Generalized coherent states as preferred states of open quantum systems

被引：17

作者：

Boixo, S. ^{[1
]}

Viola, L.

Ortiz, G.

机构：

[1] Univ New Mexico, Dept Phys & Astron, Albuquerque, NM 87131 USA

[2] Los Alamos Natl Lab, CCS Modeling Algorithms & Informat 3, Los Alamos, NM 87545 USA

[3] Dartmouth Coll, Dept Phys & Astron, Hanover, NH 03755 USA

[4] Indiana Univ, Dept Phys, Bloomington, IN 47405 USA

来源：

EPL | 2007年 / 79卷 / 04期

关键词：

D O I：

10.1209/0295-5075/79/40003

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

We 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. Copyright (C) EPLA, 2007.

引用

页数：5

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