Produção Nacional
Revisado por pares
Synchronous Observation of Bell Nonlocality and State-Dependent Contextuality
2023; American Physical Society; Volume: 130; Issue: 4 Linguagem: Inglês
10.1103/physrevlett.130.040201
ISSN1092-0145
AutoresPeng Xue, Lei Xiao, G. Ruffolo, André Mazzari, Tassius Temistocles, Marcelo Terra Cunha, Rafael Rabelo,
Tópico(s)Advanced Thermodynamics and Statistical Mechanics
ResumoBell nonlocality and Kochen-Specker contextuality are two remarkable nonclassical features of quantum theory, related to strong correlations between outcomes of measurements performed on quantum systems. Both phenomena can be witnessed by the violation of certain inequalities, the simplest and most important of which are the Clauser-Horne-Shimony-Holt (CHSH) and the Klyachko-Can-Binicio\v{g}lu-Shumovski (KCBS), for Bell nonlocality and Kochen-Specker contextuality, respectively. It has been shown that, using the most common interpretation of Bell scenarios, quantum systems cannot violate both inequalities concomitantly, thus suggesting a monogamous relation between the two phenomena. In this Letter, we show that the joint consideration of the CHSH and KCBS inequalities naturally calls for the so-called generalized Bell scenarios, which, contrary to the previous results, allows for joint violation of them. A photonic experiment thus tests the synchronous violation of both CHSH and KCBS inequalities. Our results agree with the theoretical predictions, thereby providing experimental proof of the coexistence of Bell nonlocality and Kochen-Specker contextuality in the simplest scenario, and shed new light for further explorations of nonclassical features of quantum systems.
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