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Phys Rev Lett. 2005 Jun 10;94(22):220406. Epub 2005 Jun 10.

Demonstrating superior discrimination of locally prepared states using nonlocal measurements.

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1
Centre for Quantum Computer Technology, Physics Department, The University of Queensland, Brisbane 4072, Australia.

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.

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