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- W3099053060 abstract "Contextuality is a particular quantum phenomenon that has no analogue in classical probability theory. Given two independent systems, a natural question is how to represent such a situation as a single test space. In other words, how separate contextuality scenarios combine into a joint scenario. Under the premise that the the allowed probabilistic models satisfy the No Signalling principle, Foulis and Randall defined the unique possible way to compose two contextuality scenarios. When composing strictly-more than two test spaces, however, a variety of possible composition methods have been conceived. Nevertheless, all these formally-distinct composition methods appear to give rise to observationally equivalent scenarios, in the sense that the different compositions all allow precisely the same sets of classical and quantum probabilistic models. This raises the question of whether this property of invariance-under-composition-method is special to classical and quantum probabilistic models, or if it generalizes to other probabilistic models as well, our particular focus being $mathcal{Q}_1$ models. $mathcal{Q}_1$ models are physically important since, when applied to scenarios constructed by a particular composition rule, coincide with the well-defined Almost Quantum Correlations. In this work we see that some composition rules, however, give rise to scenarios with inequivalent allowed sets of $mathcal{Q}_1$ models. We find that the non-trivial dependence of $mathcal{Q}_1$ models on the choice of composition method is apparently an artifact of failure of those composition rules to capture the orthogonality relations given by the Local Orthogonality principle. We prove that $mathcal{Q}_1$ models satisfy invariance-under-composition-method for all the constructive compositions protocols which do capture this notion of Local Orthogonality." @default.
- W3099053060 created "2020-11-23" @default.
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- W3099053060 date "2018-04-24" @default.
- W3099053060 modified "2023-09-27" @default.
- W3099053060 title "Multipartite Composition of Contextuality Scenarios" @default.
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- W3099053060 doi "https://doi.org/10.1007/s10701-018-0168-x" @default.
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