Demonstrating quantum nonlocality without entanglement

Details Demonstrating quantum nonlocality without entanglement Demonstrating quantum nonlocality without entanglement

2004-10-26

arxiv.org/abs/quant-ph/0410203v2

Phys.Rev.Lett.94:220406,2005

Physics

Quantum Physics

4 pages, 3 figures, RevTeX 4

Scientific paper

10.1103/PhysRevLett.94.220406

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(2), compared with the maximum locally achievable value of 2/3 and the overall optimal value of 0.75.

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