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Maximally nonlocal theories cannot be maximally random

de la Torre, Gonzalo; Hoban, Matty J.; Dhara, Chirag; Prettico, Giuseppe and Acín, Antonio. 2015. Maximally nonlocal theories cannot be maximally random. Physical Review Letters, 114(160502), ISSN 0031-9007 [Article]

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Abstract or Description

Correlations that violate a Bell inequality are said to be nonlocal; i.e., they do not admit a local and deterministic explanation. Great effort has been devoted to study how the amount of nonlocality (as measured by a Bell inequality violation) serves to quantify the amount of randomness present in observed correlations. In this work we reverse this research program and ask what do the randomness certification capabilities of a theory tell us about the nonlocality of that theory. We find that, contrary to initial intuition, maximal randomness certification cannot occur in maximally nonlocal theories. We go on and show that quantum theory, in contrast, permits certification of maximal randomness in all dichotomic scenarios. We hence pose the question of whether quantum theory is optimal for randomness; i.e., is it the most nonlocal theory that allows maximal randomness certification? We answer this question in the negative by identifying a larger-than-quantum set of correlations capable of this feat. Not only are these results relevant to understanding quantum mechanics’ fundamental features, but also put fundamental restrictions on device-independent protocols based on the no-signaling principle.

Item Type:

Article

Identification Number (DOI):

https://doi.org/10.1103/PhysRevLett.114.160502

Departments, Centres and Research Units:

Computing

Dates:

DateEvent
20 March 2014Submitted
23 March 2015Accepted
22 April 2015Published

Item ID:

27388

Date Deposited:

04 Nov 2019 11:08

Last Modified:

05 Nov 2019 05:05

Peer Reviewed:

Yes, this version has been peer-reviewed.

URI:

http://research.gold.ac.uk/id/eprint/27388

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