No Bipartite-Nonlocal Causal Theory Can Explain Nature's Correlations

We show that some tripartite quantum correlations are inexplicable by any causal theory involving bipartite nonclassical common causes and unlimited shared randomness. This constitutes a device-independent proof that Nature's nonlocality is fundamentally at least tripartite in every conceivable...

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Bibliographic Details
Published in:arXiv.org 2021-11
Main Authors: Coiteux-Roy, Xavier, Wolfe, Elie, Marc-Olivier Renou
Format: Article
Language:English
Subjects:
Correlation
Randomness
Online Access:Get full text
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Summary:We show that some tripartite quantum correlations are inexplicable by any causal theory involving bipartite nonclassical common causes and unlimited shared randomness. This constitutes a device-independent proof that Nature's nonlocality is fundamentally at least tripartite in every conceivable physical theory - no matter how exotic. To formalize this claim we are compelled to substitute Svetlichny's historical definition of genuine tripartite nonlocality with a novel theory-agnostic definition tied to the framework of Local Operations and Shared Randomness (LOSR). A companion article [PRA. 104, 052207 (2021)] generalizes these concepts to any number of parties, providing experimentally amenable device-independent inequality constraints along with quantum correlations violating them, thereby certifying that Nature's nonlocality must be boundlessly multipartite.
ISSN:2331-8422
DOI:10.48550/arxiv.2105.09381