Spin entanglement, decoherence and Bohm’s EPR paradox

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Title Spin entanglement, decoherence and Bohm’s EPR paradox
Author Cavalcanti, Eric Gama; Drummond, P. D.; Bachor, H. A.; Reid, M. D.
Journal Name Optics Express
Editor Martijn de Sterke
Year Published 2009
Place of publication United States
Publisher Optical Society of America
Abstract We obtain criteria for entanglement and the EPR paradox for spin-entangled particles and analyse the effects of decoherence caused by absorption and state purity errors. For a two qubit photonic state, entanglement can occur for all transmission efficiencies. In this case, the state preparation purity must be above a threshold value. However, Bohm’s spin EPR paradox can be achieved only above a critical level of loss. We calculate a required efficiency of 58%, which appears achievable with current quantum optical technologies. For a macroscopic number of particles prepared in a correlated state, spin entanglement and the EPR paradox can be demonstrated using our criteria for efficiencies η > 1/3 and η > 2/3 respectively. This indicates a surprising insensitivity to loss decoherence, in a macroscopic system of ultra-cold atoms or photons.
Peer Reviewed Yes
Published Yes
Alternative URI http://dx.doi.org/10.1364/OE.17.018693
Copyright Statement Copyright 2009 OSA. This paper was published in Optics Express and is made available as an electronic reprint with the permission of OSA. The paper can be found at the following URL on the OSA website: dx.doi.org/10.1364/OE.17.018693. Systematic or multiple reproduction or distribution to multiple locations via electronic or other means is prohibited and is subject to penalties under law.
Volume 17
Issue Number 21
Page from 18693
Page to 18702
ISSN 1094-4087
Date Accessioned 2009-10-05
Language en_US
Faculty Faculty of Science, Environment, Engineering and Technology
Subject Quantum Information, Computation and Communication; Quantum Optics
URI http://hdl.handle.net/10072/26817
Publication Type Journal Articles (Refereed Article)
Publication Type Code c1

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