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dc.contributor.authorCavalcanti, Eric G
dc.date.accessioned2019-05-29T12:38:57Z
dc.date.available2019-05-29T12:38:57Z
dc.date.issued2018
dc.identifier.issn2160-3308
dc.identifier.doi10.1103/PhysRevX.8.021018
dc.identifier.urihttp://hdl.handle.net/10072/381224
dc.description.abstractNonlocality and contextuality are at the root of conceptual puzzles in quantum mechanics, and they are key resources for quantum advantage in information-processing tasks. Bell nonlocality is best understood as the incompatibility between quantum correlations and the classical theory of causality, applied to relativistic causal structure. Contextuality, on the other hand, is on a more controversial foundation. In this work, I provide a common conceptual ground between nonlocality and contextuality as violations of classical causality. First, I show that Bell inequalities can be derived solely from the assumptions of no signaling and no fine-tuning of the causal model. This removes two extra assumptions from a recent result from Wood and Spekkens and, remarkably, does not require any assumption related to independence of measurement settings—unlike all other derivations of Bell inequalities. I then introduce a formalism to represent contextuality scenarios within causal models and show that all classical causal models for violations of a Kochen-Specker inequality require fine-tuning. Thus, the quantum violation of classical causality goes beyond the case of spacelike-separated systems and already manifests in scenarios involving single systems.
dc.description.peerreviewedYes
dc.languageEnglish
dc.language.isoeng
dc.publisherAmerican Physical Society
dc.publisher.placeUnited States
dc.relation.ispartofchapter21018
dc.relation.ispartofpagefrom1
dc.relation.ispartofpageto9
dc.relation.ispartofjournalPhysical Review X
dc.relation.ispartofvolume8
dc.subject.fieldofresearchFoundations of quantum mechanics
dc.subject.fieldofresearchQuantum information, computation and communication
dc.subject.fieldofresearchcode510802
dc.subject.fieldofresearchcode510803
dc.titleClassical Causal Models for Bell and Kochen-Specker Inequality Violations Require Fine-Tuning
dc.typeJournal article
dc.type.descriptionC1 - Articles
dc.type.codeC - Journal Articles
dcterms.licensehttp://creativecommons.org/licenses/by/3.0/
dc.description.versionVersion of Record (VoR)
gro.facultyGriffith Sciences, School of Environment and Science
gro.rights.copyright© The Author(s) 2018. For information about this journal please refer to the publisher’s website or contact the author(s). Articles are licensed under the terms of the Creative Commons Attribution 3.0 Unported License which permits unrestricted, non-commercial use, distribution and reproduction in any medium, providing that the work is properly cited.
gro.hasfulltextFull Text
gro.griffith.authorCavalcanti, Eric G.


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