Causality and Cirel'son bounds

Details Causality and Cirel'son bounds Causality and Cirel'son bounds

2004-09-11

arxiv.org/abs/quant-ph/0409066v2

Physics

Quantum Physics

5 pages

Scientific paper

10.1103/PhysRevA.72.052103

An EPR-Bell type experiment carried out on an entangled quantum system can produce correlations stronger than allowed by local realistic theories. However there are correlations that are no-signaling and are more non local than the quantum correlations. Here we show that any correlations more non local than those achievable in an EPR-Bell type experiment necessarily allow -in the context of the quantum formalism- both for signaling and for generation of entanglement. We use our approach to rederive Cirel'son bound for the CHSH expression, and we derive a new Cirel'son type bound for qutrits. We discuss in detail the interpretation of our approach.

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