Entanglement Constrained by Superselection Rules.

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Title Entanglement Constrained by Superselection Rules.
Author Bartlett, Stephen D.; Wiseman, Howard Mark
Journal Name Physical Review Letters
Year Published 2003
Place of publication USA
Publisher American Physical Society
Abstract Bipartite entanglement may be reduced if there are restrictions on allowed local operations. We introduce the concept of a generalized superselection rule to describe such restrictions, and quantify the entanglement constrained by it. We show that ensemble quantum information processing, where elements in the ensemble are not individually addressable, is subject to the superselection rule associated with the symmetric group (the group of permutations of elements). We prove that even for an ensemble comprising many pairs of qubits, each pair described by a pure Bell state, the entanglement per element constrained by this superselection rule goes to zero for a large number of elements.
Peer Reviewed Yes
Published Yes
Publisher URI http://prola.aps.org/
Alternative URI http://dx.doi.org/10.1103/PhysRevLett.91.097903
Copyright Statement Copyright 2003 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 91
Issue Number 9
Page from 097903.1
Page to 097903.4
ISSN 0031-9007
Date Accessioned 2004-03-29
Language en_AU
Research Centre Centre for Quantum Dynamics
Faculty Faculty of Science
Subject PRE2009-Theoretical Physics
URI http://hdl.handle.net/10072/6305
Publication Type Journal Articles (Refereed Article)
Publication Type Code c1

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