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)
Year published
2005
Metadata
Show full item recordAbstract
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
Subject
Mathematical sciences
Physical sciences
Engineering