Experimental nonclassicality in a causal network without assuming freedom of choice

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dc.contributor.authorPolino, Emanuele
dc.contributor.authorPoderini, Davide
dc.contributor.authorRodari, Giovanni
dc.contributor.authorAgresti, Iris
dc.contributor.authorSuprano, Alessia
dc.contributor.authorCarvacho, Gonzalo
dc.contributor.authorWolfe, Elie
dc.contributor.authorCanabarro, Askery
dc.contributor.authorMoreno Filho, Marcos George Magalhães
dc.contributor.authorMilani, Giorgio
dc.contributor.authorSpekkens, Robert W.
dc.contributor.authorAraújo, Rafael Chaves Souto
dc.contributor.authorSciarrino, Fabio
dc.date.accessioned2025-04-22T19:20:34Z
dc.date.available2025-04-22T19:20:34Z
dc.date.issued2023-02-17
dc.description.resumoIn a Bell experiment, it is natural to seek a causal account of correlations wherein only a common cause acts on the outcomes. For this causal structure, Bell inequality violations can be explained only if causal dependencies are modeled as intrinsically quantum. There also exists a vast landscape of causal structures beyond Bell that can witness nonclassicality, in some cases without even requiring free external inputs. Here, we undertake a photonic experiment realizing one such example: the triangle causal network, consisting of three measurement stations pairwise connected by common causes and no external inputs. To demonstrate the nonclassicality of the data, we adapt and improve three known techniques: (i) a machine-learning-based heuristic test, (ii) a data-seeded inflation technique generating polynomial Bell-type inequalities and (iii) entropic inequalities. The demonstrated experimental and data analysis tools are broadly applicable paving the way for future networks of growing complexitypt_BR
dc.identifier.citationPOLINO, Emanuele et al. Experimental nonclassicality in a causal network without assuming freedom of choice. Nature Communications, v. 14, p. 909, 2023. DOI 10.1038/s41467-023-36428-w. Disponível em: https://www.nature.com/articles/s41467-023-36428-w. Acesso em: 17 mar. 2025.pt_BR
dc.identifier.doihttps://doi.org/10.1038/s41467-023-36428-w
dc.identifier.issne2041-1723
dc.identifier.urihttps://repositorio.ufrn.br/handle/123456789/63502
dc.languageenpt_BR
dc.publisherNature Communicationspt_BR
dc.rights.urihttps://creativecommons.org/licenses/by/4.0/
dc.subjectTeoria quânticapt_BR
dc.subjectQuantum theorypt_BR
dc.subjectRedes causaispt_BR
dc.subjectCausal networkspt_BR
dc.subjectExperimento de Bellpt_BR
dc.subjectBell's experimentpt_BR
dc.titleExperimental nonclassicality in a causal network without assuming freedom of choicept_BR
dc.typearticlept_BR

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