Abstract
Initially motivated by their relevance in foundations of quantum mechanics and more recently by their applications in different contexts of quantum information science, violations of Bell inequalities have been extensively studied during the last years. In particular, an important effort has been made in order to quantify such Bell violations. Probabilistic techniques have been heavily used in this context with two different purposes. First, to quantify how common the phenomenon of Bell violations is; and second, to find large Bell violations in order to better understand the possibilities and limitations of this phenomenon. However, the strong mathematical content of these results has discouraged some of the potentially interested readers. The aim of the present work is to review some of the recent results in this direction by focusing on the main ideas and removing most of the technical details, to make the previous study more accessible to a wide audience.
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Notes
Formally, Bell talked about a local hidden variable model (LHVM).
Note that P is not a probability distribution itself. For every fixed x, y we have that \((P(a,b|x,y))_{a,b=1}^K\) is a probability distribution. However, it is standard to use this terminology. Sometimes they are also called behaviors, because of the terminology used in [49].
Note that any Bell functional M defines an inequality by writing \(\langle M, P\rangle \le \omega (M)\), \(P\in {\mathcal {L}}\).
The subscript 2 in \({\mathcal {D}}_2(N)\) refers to the bipartite case.
The exact value of the Grothendieck constant is still unknown in both the real and the complex case (see [12] for the most recent progress).
The work [3] deals with bipartite XOR games, but the problem is completely equivalent.
In fact, we state here a slightly modified version for T real, which involves a modification in the constant (see [14, Theorem 9] for details).
The result can be generalized to n parties straightforwardly.
One needs to normalize the gaussian state to have the same distribution.
Pisier has shown in [41] that such a factor can be reduced to \(\log ^{-\frac{3}{2}} N\).
The only property used by the authors is that the tensor products of j Pauli matrices form an orthogonal basis of \(M_N\) formed by observables. Any other such a system would equally work in the proof.
We will not talk about symmetric correlation Bell functionals since these should be defined as those functionals which are invariant under permutations of the parties without any extra restriction.
Here, we really mean the equations defining the facets of the set \({\mathcal {L}}\).
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Acknowledgements
The author would like to thank the referees for their many useful comments which helped to improve the readability of this paper. Author’s research was supported by the Spanish projects MTM2011-26912, Comunidad de Madrid QUITEMAD+ S2013/ICE-2801, and MINECO: ICMAT Severo Ochoa Project SEV-2011-0087 and the “Ramón y Cajal” program (RYC-2012-10449).
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Palazuelos, C. Random Constructions in Bell Inequalities: A Survey. Found Phys 48, 857–885 (2018). https://doi.org/10.1007/s10701-017-0135-y
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DOI: https://doi.org/10.1007/s10701-017-0135-y