Journal
PHYSICS LETTERS A
Volume 341, Issue 1-4, Pages 48-54Publisher
ELSEVIER
DOI: 10.1016/j.physleta.2005.04.029
Keywords
open quantum systems; reduced dynamics; entanglement; not completely positive maps
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The arguments that are often put forward to justify the singular importance given to completely positive maps over more generic maps in describing open quantum evolution are studied. We find that these do not appear convincing on closer examination. Positive as well as not positive maps are good candidates for describing open quantum evolution. (c) 2005 Elsevier B.V. All rights reserved.
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