Preparation contextuality powers parity-oblivious multiplexing

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dc.creatorSpekkens, Robert W.
dc.creatorBuzacott, D. H.
dc.creatorKeehn, A. J.
dc.creatorToner, Ben
dc.creatorPryde, G. J.
dc.date2008-05-10
dc.date2009-01-08
dc.date.accessioned2026-07-07T12:27:22Z
dc.date.available2026-07-07T12:27:22Z
dc.descriptionIn a noncontextual hidden variable model of quantum theory, hidden variables determine the outcomes of every measurement in a manner that is independent of how the measurement is implemented. Using a generalization of this notion to arbitrary operational theories and to preparation procedures, we demonstrate that a particular two-party information-processing task, "parity-oblivious multiplexing," is powered by contextuality in the sense that there is a limit to how well any theory described by a noncontextual hidden variable model can perform. This bound constitutes a "noncontextuality inequality" that is violated by quantum theory. We report an experimental violation of this inequality in good agreement with the quantum predictions. The experimental results also provide the first demonstration of 2-to-1 and 3-to-1 quantum random access codes. Consequently, our experimental results also demonstrate better-than-classical performance for this task. They also represent the first demonstration of 2-to-1 and 3-to-1 quantum random access codes.
dc.description7 pages, 2 figures; published version with supplementary material included as appendices
dc.identifierhttps://arxiv.org/abs/0805.1463
dc.identifierhttp://arxiv.org/abs/0805.1463
dc.identifierPhys. Rev. Lett. 102, 010401 (2009)
dc.identifierdoi:10.1103/PhysRevLett.102.010401
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/215184
dc.subjectQuantum Physics
dc.titlePreparation contextuality powers parity-oblivious multiplexing
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