Quantum steering beyond instrumental causal networks

Nery, Ranieri Vieira; Taddei, M. M.; Araújo, Rafael Chaves Souto; Aolita, L.

Quantum steering beyond instrumental causal networks

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dc.contributor.author	Nery, Ranieri Vieira
dc.contributor.author	Taddei, M. M.
dc.contributor.author	Araújo, Rafael Chaves Souto
dc.contributor.author	Aolita, L.
dc.date.accessioned	2020-09-28T14:01:20Z
dc.date.available	2020-09-28T14:01:20Z
dc.date.issued	2018-04-06
dc.description.resumo	We theoretically predict, and experimentally verify with entangled photons, that outcome communication is not enough for hidden-state models to reproduce quantum steering. Hidden-state models with outcome communication correspond, in turn, to the well-known instrumental processes of causal inference but in the one-sided device-independent scenario of one black-box measurement device and one wellcharacterized quantum apparatus. We introduce one-sided device-independent instrumental inequalities to test against these models, with the appealing feature of detecting entanglement even when communication of the black box’s measurement outcome is allowed.We find that, remarkably, these inequalities can also be violated solely with steering, i.e., without outcome communication. In fact, an efficiently computable formal quantifier—the robustness of noninstrumentality—naturally arises, and we prove that steering alone is enough to maximize it. Our findings imply that quantum theory admits a stronger form of steering than known until now, with fundamental as well as practical potential implications	pt_BR
dc.identifier.citation	NERY, R. V.; TADDEI, M. M.; CHAVES, R.; AOLITA, L.. Quantum Steering Beyond Instrumental Causal Networks. Physical Review Letters, [S.L.], v. 120, n. 14, p. 140408, 6 abr. 2018. Disponível em: https://journals.aps.org/prl/abstract/10.1103/PhysRevLett.120.140408. Acesso em: 16 set. 2020. http://dx.doi.org/10.1103/physrevlett.120.140408.	pt_BR
dc.identifier.doi	10.1103/physrevlett.120.140408
dc.identifier.issn	0031-9007
dc.identifier.issn	1079-7114
dc.identifier.uri	https://repositorio.ufrn.br/handle/123456789/30210
dc.language	en	pt_BR
dc.publisher	American Physical Society	pt_BR
dc.subject	Quantum communication	pt_BR
dc.subject	Quantum foundations	pt_BR
dc.subject	Quantum nonlocality	pt_BR
dc.subject	Quantum optics	pt_BR
dc.subject	Resource theories	pt_BR
dc.title	Quantum steering beyond instrumental causal networks	pt_BR
dc.type	article	pt_BR