Nonlocality and entanglement as opposite properties

Details Nonlocality and entanglement as opposite properties Nonlocality and entanglement as opposite properties

2011-06-11

arxiv.org/abs/1106.2240v1

Physics

Quantum Physics

4 pages + 2 pages of Supplementary Information

Scientific paper

We show that, for any chained Bell inequality with any number of settings, nonlocality and entanglement are not only essentially different properties but opposite ones. We first show that, in the absence of noise, the threshold detection efficiency for a loophole-free Bell test increases with the degree of entanglement, so that the closer the quantum states are to product states, the harder it is to reproduce the quantum predictions with local models. In the presence of white noise, we show that nonlocality and entanglement are simultaneously maximized only in the presence of extreme noise; in any other case, the lowest threshold detection efficiency is obtained by reducing the entanglement.

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