Simple Hardy-Like Proof of Quantum Contextuality
2013 (English)In: Physical Review Letters, ISSN 0031-9007, Vol. 111, no 18, 180404- p.Article in journal (Refereed) Published
Contextuality and nonlocality are two fundamental properties of nature. Hardy's proof is considered the simplest proof of nonlocality and can also be seen as a particular violation of the simplest Bell inequality. A fundamental question is: Which is the simplest proof of contextuality? We show that there is a Hardy-like proof of contextuality that can also be seen as a particular violation of the simplest noncontextuality inequality. Interestingly, this new proof connects this inequality with the proof of the Kochen-Specker theorem, providing the missing link between these two fundamental results, and can be extended to an arbitrary odd number n of settings, an extension that can be seen as a particular violation of the n-cycle inequality.
Place, publisher, year, edition, pages
2013. Vol. 111, no 18, 180404- p.
IdentifiersURN: urn:nbn:se:su:diva-97034DOI: 10.1103/PhysRevLett.111.180404ISI: 000326279400001OAI: oai:DiVA.org:su-97034DiVA: diva2:670500
MINECO, Spain FIS2011-29400; Fapemi; Capes; CNPq; Swedish Research Council (VR;) ERC Advanced Grant QOLAPS 2013-12-032013-12-022013-12-03Bibliographically approved