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  • Demonstrating Superior Discrimination of Locally Prepared States Using Nonlocal Measurements

    Author(s)
    Pryde, GJ
    O'Brien, JL
    White, AG
    Bartlett, SD
    Griffith University Author(s)
    Pryde, Geoff
    Year published
    2005
    Metadata
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    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 ᠰ.02, compared with the maximum locally achievable value of 2/3 and the overall optimal value of 0.75.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 ᠰ.02, compared with the maximum locally achievable value of 2/3 and the overall optimal value of 0.75.
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    Journal Title
    Physical Review Letters
    Volume
    94
    Issue
    22
    DOI
    https://doi.org/10.1103/PhysRevLett.94.220406
    Subject
    Mathematical sciences
    Physical sciences
    Engineering
    Publication URI
    http://hdl.handle.net/10072/20941
    Collection
    • Journal articles

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