Demonstrating Superior Discrimination of Locally Prepared States Using Nonlocal Measurements

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Title Demonstrating Superior Discrimination of Locally Prepared States Using Nonlocal Measurements
Author Pryde, Geoff; O'Brien, J. L.; White, A. G.; Bartlett, S. D.
Journal Name Physical Review Letters
Year Published 2005
Place of publication Ridge, NY
Publisher American Physical Society
Abstract We experimentally demonstrate the superior discrimination of separated, unentangled two-qubit correlated states using nonlocal measurements, when compared with measurements based on local operations and classical communications. When predicted theoretically, this phenomenon was dubbed ''quantum nonlocality without entanglement.'' We characterize the performance of the nonlocal, or joint, measurement with a payoff function, for which we measure 0.72 ± 0.02, compared with the maximum locally achievable value of 2/3 and the overall optimal value of 0.75.
Peer Reviewed Yes
Published Yes
Publisher URI http://dx.doi.org/10.1103/PhysRevLett.94.220406
Alternative URI http://prl.aps.org
Volume 94
Issue Number 22
Page from 220406-1
Page to 220406-4
ISSN 1079-7114
Date Accessioned 2006-06-23
Date Available 2009-01-06T06:38:47Z
Language en_AU
Research Centre Centre for Quantum Dynamics
Faculty Faculty of Science
Subject Physical Sciences; Quantum Optics and Lasers
URI http://hdl.handle.net/10072/20941
Publication Type Journal Articles (Refereed Article)
Publication Type Code c1x

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