Violations of local realism by two entangled quNits

Collins, Daniel; Popescu, Sandu

HPL-BRIMS-2001-16

Keyword(s): Bell inequalities; local realism; quantum information; quantum foundations; hidden non-locality; quantum non- locality; non-locality

Abstract: Results obtained in two recent papers, [1] and [2] seem to indicate that the nonlocal character of the correlations between the outcomes of measurements performed on entangled systems separated in space is not robust in the presence of noise. This is surprising, since entanglement itself is robust. Here we revisit this problem and argue that the class of gedanken-experiments considered in [1] and [2] is too restrictive. By considering a more general class, involving sequences of measurements, we prove that the nonlocal correlations are in fact robust.

3 Pages

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