Exposure of subtle multipartite quantum nonlocality

Abstract The celebrated Einstein–Podolsky–Rosen quantum steering has a complex structure in the multipartite scenario. We show that a naively defined criterion for multipartite steering allows, like in Bell nonlocality, for a contradictory effect whereby local operations could create steering seemin...

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Autores principales:	M. M. Taddei, T. L. Silva, R. V. Nery, G. H. Aguilar, S. P. Walborn, L. Aolita
Formato:	article
Lenguaje:	EN
Publicado:	Nature Portfolio 2021
Materias:	Physics QC1-999 Electronic computers. Computer science QA75.5-76.95
Acceso en línea:	https://doaj.org/article/facd8b1b447b4977ab819f3e9f48f7f1
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spelling	oai:doaj.org-article:facd8b1b447b4977ab819f3e9f48f7f12021-12-02T14:29:05ZExposure of subtle multipartite quantum nonlocality10.1038/s41534-021-00402-52056-6387https://doaj.org/article/facd8b1b447b4977ab819f3e9f48f7f12021-05-01T00:00:00Zhttps://doi.org/10.1038/s41534-021-00402-5https://doaj.org/toc/2056-6387Abstract The celebrated Einstein–Podolsky–Rosen quantum steering has a complex structure in the multipartite scenario. We show that a naively defined criterion for multipartite steering allows, like in Bell nonlocality, for a contradictory effect whereby local operations could create steering seemingly from scratch. Nevertheless, neither in steering nor in Bell nonlocality has this effect been experimentally confirmed. Operational consistency is reestablished by presenting a suitable redefinition: there is a subtle form of steering already present at the start, and it is only exposed—as opposed to created—by the local operations. We devise protocols that, remarkably, are able to reveal, in seemingly unsteerable systems, not only steering, but also Bell nonlocality. Moreover, we find concrete cases where entanglement certification does not coincide with steering. A causal analysis reveals the crux of the issue to lie in hidden signaling. Finally, we implement one of the protocols with three photonic qubits deterministically, providing the experimental demonstration of both exposure and super-exposure of quantum nonlocality.M. M. TaddeiT. L. SilvaR. V. NeryG. H. AguilarS. P. WalbornL. AolitaNature PortfolioarticlePhysicsQC1-999Electronic computers. Computer scienceQA75.5-76.95ENnpj Quantum Information, Vol 7, Iss 1, Pp 1-8 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	Physics QC1-999 Electronic computers. Computer science QA75.5-76.95
spellingShingle	Physics QC1-999 Electronic computers. Computer science QA75.5-76.95 M. M. Taddei T. L. Silva R. V. Nery G. H. Aguilar S. P. Walborn L. Aolita Exposure of subtle multipartite quantum nonlocality
description	Abstract The celebrated Einstein–Podolsky–Rosen quantum steering has a complex structure in the multipartite scenario. We show that a naively defined criterion for multipartite steering allows, like in Bell nonlocality, for a contradictory effect whereby local operations could create steering seemingly from scratch. Nevertheless, neither in steering nor in Bell nonlocality has this effect been experimentally confirmed. Operational consistency is reestablished by presenting a suitable redefinition: there is a subtle form of steering already present at the start, and it is only exposed—as opposed to created—by the local operations. We devise protocols that, remarkably, are able to reveal, in seemingly unsteerable systems, not only steering, but also Bell nonlocality. Moreover, we find concrete cases where entanglement certification does not coincide with steering. A causal analysis reveals the crux of the issue to lie in hidden signaling. Finally, we implement one of the protocols with three photonic qubits deterministically, providing the experimental demonstration of both exposure and super-exposure of quantum nonlocality.
format	article
author	M. M. Taddei T. L. Silva R. V. Nery G. H. Aguilar S. P. Walborn L. Aolita
author_facet	M. M. Taddei T. L. Silva R. V. Nery G. H. Aguilar S. P. Walborn L. Aolita
author_sort	M. M. Taddei
title	Exposure of subtle multipartite quantum nonlocality
title_short	Exposure of subtle multipartite quantum nonlocality
title_full	Exposure of subtle multipartite quantum nonlocality
title_fullStr	Exposure of subtle multipartite quantum nonlocality
title_full_unstemmed	Exposure of subtle multipartite quantum nonlocality
title_sort	exposure of subtle multipartite quantum nonlocality
publisher	Nature Portfolio
publishDate	2021
url	https://doaj.org/article/facd8b1b447b4977ab819f3e9f48f7f1
work_keys_str_mv	AT mmtaddei exposureofsubtlemultipartitequantumnonlocality AT tlsilva exposureofsubtlemultipartitequantumnonlocality AT rvnery exposureofsubtlemultipartitequantumnonlocality AT ghaguilar exposureofsubtlemultipartitequantumnonlocality AT spwalborn exposureofsubtlemultipartitequantumnonlocality AT laolita exposureofsubtlemultipartitequantumnonlocality
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Exposure of subtle multipartite quantum nonlocality

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