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oai:recercat.cat:2117/790102025-07-17T10:16:17Zcom_2072_1033col_2072_452950

Inequivalence of entanglement, steering, and Bell nonlocality for general measurements Quintino, Marco Tulio Vértesi, Tamas Cavalcanti, Daniel Augusiak, Remigiusz Demianowicz, Maciej Acín dal Maschio, Antonio Brunner, Nicolas Universitat Politècnica de Catalunya. Institut de Ciències Fotòniques Àrees temàtiques de la UPC::Física Quantum communication entanglement Quàntums, Teoria dels Einstein-Podolsky-Rosen steering is a form of inseparability in quantum theory commonly acknowledged to be intermediate between entanglement and Bell nonlocality. However, this statement has so far only been proven for a restricted class of measurements, namely, projective measurements. Here we prove that entanglement, one-way steering, two-way steering, and nonlocality are genuinely different considering general measurements, i.e., single round positive-operator-valued measures. Finally, we show that the use of sequences of measurements is relevant for steering tests, as they can be used to reveal “hidden steering.” Peer Reviewed Postprint (author's final draft) 2015-09-08 Article 1050-2947 https://hdl.handle.net/2117/79010 eng http://journals.aps.org/pra/abstract/10.1103/PhysRevA.92.032107 PP00P2_138917 http://creativecommons.org/licenses/by-nc-nd/3.0/es/ Open Access Attribution-NonCommercial-NoDerivs 3.0 Spain 6 p. application/pdf APS