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Correlations constrained by composite measurements

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John H. Selby1, Ana Belén Sainz1, Victor Magron2, Łukasz Czekaj1, and Michał Horodecki1

1International Centre for Theory of Quantum Technologies, University of Gdańsk, 80-308 Gdańsk, Poland
2LAAS-CNRS and Institute of Mathematics, University of Toulouse, LAAS, 7 Avenue du Colonel Roche, 31077 Toulouse Cédex 4, France

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Abstract

How to understand the set of correlations admissible in nature is one outstanding open problem in the core of the foundations of quantum theory. Here we take a complementary viewpoint to the device-independent approach, and explore the correlations that physical theories may feature when restricted by some particular constraints on their measurements. We show that demanding that a theory exhibits a composite measurement imposes a hierarchy of constraints on the structure of its sets of states and effects, which translate to a hierarchy of constraints on the allowed correlations themselves. We moreover focus on the particular case where one demands the existence of a correlated measurement that reads out the parity of local fiducial measurements. By formulating a non-linear Optimisation Problem, and semidefinite relaxations of it, we explore the consequences of the existence of such a parity reading measurement for violations of Bell inequalities. In particular, we show that in certain situations this assumption has surprisingly strong consequences, namely, that Tsirelson’s bound can be recovered.

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Cited by

[1] Thomas D. Galley, Flaminia Giacomini, and John H. Selby, “A no-go theorem on the nature of the gravitational field beyond quantum theory”, Quantum 6, 779 (2022).

[2] Martin Plávala, “General probabilistic theories: An introduction”, arXiv:2103.07469, (2021).

[3] John H. Selby, David Schmid, Elie Wolfe, Ana Belén Sainz, Ravi Kunjwal, and Robert W. Spekkens, “Accessible fragments of generalized probabilistic theories, cone equivalence, and applications to witnessing nonclassicality”, Physical Review A 107 6, 062203 (2023).

[4] Giorgos Eftaxias, Mirjam Weilenmann, and Roger Colbeck, “Joint measurements in boxworld and their role in information processing”, arXiv:2209.04474, (2022).

[5] Paulo J. Cavalcanti, John H. Selby, Jamie Sikora, and Ana Belén Sainz, “Decomposing all multipartite non-signalling channels via quasiprobabilistic mixtures of local channels in generalised probabilistic theories”, Journal of Physics A Mathematical General 55 40, 404001 (2022).

The above citations are from SAO/NASA ADS (last updated successfully 2023-08-10 12:05:55). The list may be incomplete as not all publishers provide suitable and complete citation data.

Could not fetch Crossref cited-by data during last attempt 2023-08-10 12:05:54: Could not fetch cited-by data for 10.22331/q-2023-08-10-1080 from Crossref. This is normal if the DOI was registered recently.

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