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- Title
Quantum non-locality based on finite-speed causal influences leads to superluminal signalling.
- Authors
Bancal, J-D.; Pironio, S.; Acín, A.; Liang, Y-C.; Scarani, V.; Gisin, N.
- Abstract
The experimental violation of Bell inequalities using space-like separated measurements precludes the explanation of quantum correlations through causal influences propagating at subluminal speed. Yet, any such experimental violation could always be explained in principle through models based on hidden influences propagating at a finite speed v>c, provided v is large enough. Here, we show that for any finite speed v with , such models predict correlations that can be exploited for faster-than-light communication. This superluminal communication does not require access to any hidden physical quantities, but only the manipulation of measurement devices at the level of our present-day description of quantum experiments. Hence, assuming the impossibility of using non-local correlations for superluminal communication, we exclude any possible explanation of quantum correlations in terms of influences propagating at any finite speed. Our result uncovers a new aspect of the complex relationship between multipartite quantum non-locality and the impossibility of signalling.
- Subjects
BELL'S theorem; QUANTUM theory; SUPERLUMINAL effect; SIGNAL processing; OPTICAL communications; MATHEMATICAL models
- Publication
Nature Physics, 2012, Vol 8, Issue 12, p867
- ISSN
1745-2473
- Publication type
Article
- DOI
10.1038/nphys2460