All quantum states useful for teleportation are nonlocal resources

Cavalcanti, D. and Acin, A. and Brunner, N. and Vértesi, Tamás (2013) All quantum states useful for teleportation are nonlocal resources. PHYSICAL REVIEW A, 87 (4). ISSN 2469-9926

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Abstract

Understanding the relation between the different forms of inseparability in quantum mechanics is a long- standing problem in the foundations of quantum theory and has implications for quantum information process- ing. Here we make progress in this direction by establishing a direct link between quantum teleportation and Bell nonlocality. In particular, we show that all entangled states which are useful for teleportation are nonlocal resources, i.e. lead to deterministic violation of Bell’s inequality. Our result exploits the phenomenon of super- activation of quantum nonlocality, recently proved by Palazuelos, and suggests that the latter might in fact be generic.

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