title: Testing contextuality on quantum ensembles with one clean qubit.
abstract: We present a protocol to evaluate the expectation value of the correlations of measurement outcomes for ensembles of quantum systems, and use it to experimentally demonstrate--under an assumption of fair sampling--the violation of an inequality that is satisfied by any noncontextual hidden-variables theory. The experiment is performed on an ensemble of molecular nuclear spins in the solid state, using established nuclear magnetic resonance techniques for quantum-information processing.
authors.affiliation: Institute for Quantum Computing and Department of Physics and Astronomy, University of Waterloo, Waterloo, Ontario, N2L3G1, Canada. omoussa@iqc.ca
authors.forename: Osama
authors.initials: O
authors.lastname: Moussa
authors.forename: Colm A
authors.initials: CA
authors.lastname: Ryan
authors.forename: David G
authors.initials: DG
authors.lastname: Cory
authors.forename: Raymond
authors.initials: R
authors.lastname: Laflamme