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Article: Nonlocality without entanglement: Quantum theory and beyond

TitleNonlocality without entanglement: Quantum theory and beyond
Authors
Issue Date2020
PublisherAmerican Physical Society. The Journal's web site is located at https://journals.aps.org/prresearch/
Citation
Physical Review Research, 2020, v. 2, p. article no. 012068(R) How to Cite?
AbstractQuantum nonlocality without entanglement (Q-NWE) captures nonlocal behavior of multipartite product states as they may entail global operation for optimal decoding of the classical information encoded in the state ensemble that allows local preparation. In this Rapid Communication we show that the phenomena of NWE is not specific to quantum theory only, but rather a class of generalized probabilistic theories that can exhibit such behavior. In fact, several manifestations of NWE, e.g., asymmetric local discrimination, suboptimal local discrimination, the notion of separable but locally unimplementable measurements arise generically in operational theories other than quantum theory. We propose a framework to compare the strength of NWE in different theories and show that such behavior in quantum theory is limited, suggesting a specific topological feature of quantum theory, namely, the continuity of state space structure. Our work adds the erstwhile missing foundational appeal to the study of NWE phenomena along with its information-theoretic relevance.
DescriptionHybrid open access
Persistent Identifierhttp://hdl.handle.net/10722/291049
ISSN
2023 Impact Factor: 3.5
2023 SCImago Journal Rankings: 1.689
ISI Accession Number ID

 

DC FieldValueLanguage
dc.contributor.authorBhattacharya, SS-
dc.contributor.authorSaha, S-
dc.contributor.authorGuha, T-
dc.contributor.authorBanik, M-
dc.date.accessioned2020-11-02T05:50:50Z-
dc.date.available2020-11-02T05:50:50Z-
dc.date.issued2020-
dc.identifier.citationPhysical Review Research, 2020, v. 2, p. article no. 012068(R)-
dc.identifier.issn2643-1564-
dc.identifier.urihttp://hdl.handle.net/10722/291049-
dc.descriptionHybrid open access-
dc.description.abstractQuantum nonlocality without entanglement (Q-NWE) captures nonlocal behavior of multipartite product states as they may entail global operation for optimal decoding of the classical information encoded in the state ensemble that allows local preparation. In this Rapid Communication we show that the phenomena of NWE is not specific to quantum theory only, but rather a class of generalized probabilistic theories that can exhibit such behavior. In fact, several manifestations of NWE, e.g., asymmetric local discrimination, suboptimal local discrimination, the notion of separable but locally unimplementable measurements arise generically in operational theories other than quantum theory. We propose a framework to compare the strength of NWE in different theories and show that such behavior in quantum theory is limited, suggesting a specific topological feature of quantum theory, namely, the continuity of state space structure. Our work adds the erstwhile missing foundational appeal to the study of NWE phenomena along with its information-theoretic relevance.-
dc.languageeng-
dc.publisherAmerican Physical Society. The Journal's web site is located at https://journals.aps.org/prresearch/-
dc.relation.ispartofPhysical Review Research-
dc.rightsCopyright [2020] by The American Physical Society. This article is available online at [http://dx.doi.org/10.1103/PhysRevResearch.2.012068].-
dc.rightsThis work is licensed under a Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License.-
dc.titleNonlocality without entanglement: Quantum theory and beyond-
dc.typeArticle-
dc.identifier.emailBhattacharya, SS: some@hku.hk-
dc.description.naturepublished_or_final_version-
dc.identifier.doi10.1103/PhysRevResearch.2.012068-
dc.identifier.scopuseid_2-s2.0-85094716302-
dc.identifier.hkuros317857-
dc.identifier.volume2-
dc.identifier.spagearticle no. 012068(R)-
dc.identifier.epagearticle no. 012068(R)-
dc.identifier.isiWOS:000602698700001-
dc.publisher.placeUnited States-
dc.identifier.issnl2643-1564-

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