Navegando por Autor "Moreno, M. G. M."
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Artigo Device-independent secret sharing and a stronger form of Bell nonlocality(American Physical Society, 2020-05-27) Moreno, M. G. M.; Brito, Samuraí Gomes de Aguiar; Nery, Ranieri Vieira; Araújo, Rafael Chaves SoutoBell nonlocality, the fact that local hidden-variable models cannot reproduce the correlations obtained by measurements on entangled states, is a cornerstone in our modern understanding of quantum theory. Apart from its fundamental implications, nonlocality is also at the core of device-independent quantum information processing, the successful implementation of which is achieved without precise knowledge of the physical apparatus. Here we show that a stronger form of Bell nonlocality, for which even some nonlocal hiddenvariable models cannot reproduce the quantum predictions, allows us to circumvent possible attacks in the implementation of secret sharing, a paradigmatic communication protocol in which a secret split amid many possibly untrusted parts can be decoded only if they collaborate among themselvesArtigo Nonlocality distillation and quantum voids(American Physical Society, 2019-07-01) Brito, Samuraí Gomes de Aguiar; Moreno, M. G. M.; Rai, Ashutosh; Araújo, Rafael Chaves SoutoVia nonlocality distillation, a number of copies of a given nonlocal correlation can be turned into a new correlation displaying a higher degree of nonlocality. Apart from its clear relevance in situations where nonlocality is a resource, distillation protocols also play an important role in the understanding of informationtheoretical principles for quantum theory. Here, we derive a necessary condition for nonlocality distillation from two copies and apply it, among other results, to show that one-dimensional (1D) and 2D quantum voids—faces of the nonlocal simplex set with no quantum realization—can be distilled up to PR boxes. With that, we generalize previous results in the literature, for instance, showing a broad class of postquantum correlations that make communication complexity trivial and violate the information causality principle