Bell inequalities with no quantum violation and unextendible product bases

Details Bell inequalities with no quantum violation and unextendible product bases Bell inequalities with no quantum violation and unextendible product bases

2011-01-25

arxiv.org/abs/1101.4893v3

Phys. Rev. Lett. 107, 070401 (2011)

Physics

Quantum Physics

4 pages, 1 figure, journal version

Scientific paper

10.1103/PhysRevLett.107.070401

The strength of classical correlations is subject to certain constraints, commonly known as Bell inequalities. Violation of these inequalities is the manifestation of nonlocality---displayed, in particular, by quantum mechanics, meaning that quantum mechanics can outperform classical physics at tasks associated with such Bell inequalities. Interestingly, however, there exist situations in which this is not the case. We associate an intriguing class of bound entangled states, constructed from unextendable product bases (UPBs) with a wide family of tasks, for which (i) quantum correlations do not outperform the classical ones but (ii) there exist supraquantum nonsignalling correlations that do provide an advantage.

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