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American Physical Society, Physical Review Letters, 5(104), 2010

DOI: 10.1103/physrevlett.104.050401

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Nonclassical Correlations from Randomly Chosen Local Measurements

Journal article published in 2010 by Yeong-Cherng Liang ORCID, Nicholas Harrigan, Stephen D. Bartlett ORCID, Terry Rudolph
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This paper is available in a repository.

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Abstract

We show that correlations inconsistent with any locally causal description can be a generic feature of measurements on entangled quantum states. Specifically, spatially separated parties who perform local measurements on a maximally entangled state using randomly chosen measurement bases can, with significant probability, generate nonclassical correlations that violate a Bell inequality. For n parties using a Greenberger-Horne-Zeilinger state, this probability of violation rapidly tends to unity as the number of parties increases. We also show that, even with both a randomly chosen two-qubit pure state and randomly chosen measurement bases, a violation can be found about 10% of the time. Among other applications, our work provides a feasible alternative for the demonstration of Bell inequality violation without a shared reference frame.