Inequivalence of Pure State Ensembles for Open Quantum Systems: The Preferred Ensembles are Those That Are Physically Realizable

File Size Format
17158_1.pdf 93Kb Adobe PDF View
Title Inequivalence of Pure State Ensembles for Open Quantum Systems: The Preferred Ensembles are Those That Are Physically Realizable
Author Wiseman, Howard Mark; Vaccaro, John A.
Journal Name Physical Review Letters
Editor George Basbas
Year Published 2001
Place of publication USA
Publisher American Physical Society
Abstract An open quantum system in steady state ρ-^ ss can be represented by a weighted ensemble of pure states ρ-^ ss = Σk℘k|ψk〉 〈ψk| in infinitely many ways. A physically realizable (PR) ensemble is one for which some continuous measurement of the environment will collapse the system into a pure state |ψ(t)〉, stochastically evolving such that the proportion of time for which |ψ(t)〉 = |ψk〉 equals ℘k. Some, but not all, ensembles are PR. This constitutes the preferred ensemble fact. We present the necessary and sufficient conditions for a given ensemble to be PR, and illustrate the method by showing that the coherent state ensemble is not PR for an atom laser.
Peer Reviewed Yes
Published Yes
Publisher URI http://prola.aps.org/browse/PRL
Alternative URI http://dx.doi.org/10.1103/PhysRevLett.87.240402
Copyright Statement Copyright 2001 American Physical Society. This is the author-manuscript version of this paper. Reproduced in accordance with the copyright policy of the publisher. Please refer to the journal's website for access to the definitive, published version.
Volume 87
Issue Number 24
Page from 240402.1
Page to 240402.4
ISSN 0031-9007
Date Accessioned 2002-04-15
Date Available 2009-12-01T05:27:17Z
Language en_AU
Research Centre Centre for Quantum Dynamics
Faculty Faculty of Science
Subject PRE2009-Theoretical Physics
URI http://hdl.handle.net/10072/3738
Publication Type Journal Articles (Refereed Article)
Publication Type Code c1

Show simple item record

Griffith University copyright notice