Unbounded Bell violations for quantum genuine multipartite non-locality

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Amr, Abderramán and Palazuelos Cabezón, Carlos and de Vicente, Julio I (2020) Unbounded Bell violations for quantum genuine multipartite non-locality. Journal of Physics A: Mathematical and Theoretical, 53 (27). p. 275301. ISSN 1751-8113

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Official URL: https://doi.org/10.1088/1751-8121%2Fab915b




Abstract

The violations of Bell inequalities by measurements on quantum states give rise to the phenomenon of quantum non-locality and express the advantage of using quantum resources over classical ones for certain information-theoretic tasks. The relative degree of quantum violations has been well studied in the bipartite scenario and in the multipartite scenario with respect to fully local behaviours. However, the multipartite setting entails a more complex classification in which different notions on non-locality can be established. In particular, genuine multipartite non-local distributions apprehend truly multipartite effects, given that these behaviours cannot be reproduced by bilocal models that allow correlations among strict subsets of the parties beyond a local common cause. We show here that, while in the so-called correlation scenario the relative violation of bilocal Bell inequalities by quantum resources is bounded, i.e. it does not grow arbitrarily with the number of inputs, it turns out to be unbounded in the general case. We identify Bell functionals that take the form of non-local games for which the ratio of the quantum and bilocal values grows unboundedly as a function of the number of inputs and outputs.


Item Type:Article
Uncontrolled Keywords:Multipartite systems; Quantum nonlocality; Bell inequalities
Subjects:Sciences > Physics > Mathematical physics
Sciences > Physics > Quantum theory
ID Code:64101
Deposited On:25 Feb 2021 15:01
Last Modified:26 Feb 2021 08:05

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