Quantum Mechanical Realization of a Popescu-Rohrlich Box

Abstract

We consider quantum ensembles which are determined by pre- and post-selection. Unlike the case of only pre-selected ensembles, we show that in this case the probabilities for measurement outcomes at intermediate times satisfy causality only rarely; such ensembles can in general be used to signal between causally disconnected regions. We show that under restrictive conditions, there are certain non-trivial bi-partite ensembles which do satisfy causality. These ensembles give rise to a violation of the CHSH inequality, which exceeds the maximal quantum violation given by Tsirelson's bound, $B_{\mathrm{CHSH}}\le 2\sqrt{2}$, and obtains the Popescu-Rohrlich bound for the maximal violation, $B_{\mathrm{CHSH}}\le 4$. This may be regarded as an a posteriori realization of super-correlations, which have recently been termed Popescu-Rohrlich boxes.

5 pages

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• Contextuality scenarios arising from networks of stochastic processes
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• Classical, quantum and superquantum correlations