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arxiv 1904.05306 v3 pith:3KK7Q3SX submitted 2019-04-10 quant-ph

Bell non-locality and Kochen-Specker contextuality: How are they connected?

classification quant-ph
keywords bellcorrelationsquantumcontextualityconnectionsmatrixnon-localitycontextual
verification ladder T0 review T1 audit T2 compute T3 formal T4 reserved
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Bell non-locality and Kochen-Specker (KS) contextuality are logically independent concepts, fuel different protocols with quantum vs classical advantage, and have distinct classical simulation costs. A natural question is what are the relations between these concepts, advantages, and costs. To address this question, it is useful to have a map that captures all the connections between Bell non-locality and KS contextuality in quantum theory. The aim of this work is to introduce such a map. After defining the theory-independent notions of Bell non-locality and KS contextuality for ideal measurements, we show that, in quantum theory, due to Neumark's dilation theorem, every matrix of quantum Bell non-local correlations can be mapped to an identical matrix of KS contextual correlations produced in a scenario with identical relations of compatibility but where measurements are ideal and no space-like separation is required. A more difficult problem is identifying connections in the opposite direction. We show that there are "one-to-one" and partial connections between KS contextual correlations and Bell non-local correlations for some KS contextuality scenarios, but not for all of them. However, there is also a method that transforms any matrix of KS contextual correlations for quantum systems of dimension $d$ into a matrix of Bell non-local correlations between two quantum subsystems each of them of dimension $d$. We collect all these connections in map and list some problems which can benefit from this map.

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  1. Contextuality as a Diagnostic of Translation-Symmetry Breaking in Translation-Invariant 1D Hamiltonians

    quant-ph 2026-06 unverdicted novelty 7.0

    Contextuality witnesses detect translation symmetry breaking in 1D TI Hamiltonians, with maximal violation at p-periodic ground states, reducible to finite periodic rings with matching bounds.