title: Nonclassical correlations from randomly chosen local measurements.
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.
authors.affiliation: School of Physics, The University of Sydney, Sydney, New South Wales 2006, Australia. ycliang@physics.usyd.edu.au
authors.forename: Yeong-Cherng
authors.initials: YC
authors.lastname: Liang
authors.forename: Nicholas
authors.initials: N
authors.lastname: Harrigan
authors.forename: Stephen D
authors.initials: SD
authors.lastname: Bartlett
authors.forename: Terry
authors.initials: T
authors.lastname: Rudolph