Phys. Rev. Lett. 94, 220406 (2005) [4 pages]

Demonstrating Superior Discrimination of Locally Prepared States Using Nonlocal Measurements

Abstract

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G. J. Pryde^1,2,*, J. L. O’Brien^1,2,*, A. G. White^1,2,*, and Stephen D. Bartlett^2,3
¹Centre for Quantum Computer Technology, Physics Department, The University of Queensland, Brisbane 4072, Australia
²School of Physical Sciences, The University of Queensland, Brisbane 4072, Australia
³School of Physics, University of Sydney, NSW 2006, Australia

Received 25 October 2004; published 10 June 2005

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.

URL:

http://link.aps.org/doi/10.1103/PhysRevLett.94.220406

DOI:

10.1103/PhysRevLett.94.220406

PACS:

03.65.Ud, 03.65.Ta, 03.67.Hk

^*Electronic address: www.quantinfo.org

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Phys. Rev. Lett. 94, 220406 (2005) [4 pages]

Demonstrating Superior Discrimination of Locally Prepared States Using Nonlocal Measurements