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Popescu-Rohrlich Boxes in Quantum Measure Theory

Matthew Barnett, Fay Dowker, David Rideout

quant-pharXiv:quant-ph/0605253

Abstract

Two results are proved at the quantal level in Sorkin's hierarchy of measure theories. One is a strengthening of an existing bound on the correlations in the EPR-Bohm setup under the assumption that the probabilities admit a strongly positive joint quantal measure. It is also proved that any set of no-signalling probabilities, for two distant experimenters with a choice of two alternative experiments each and two possible outcomes per experiment, admits a joint quantal measure, though one that is not necessarily strongly positive.

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