# Ontological models predictively inequivalent to quantum theory.

@article{Ghirardi2013OntologicalMP,
title={Ontological models predictively inequivalent to quantum theory.},
author={Giancarlo Ghirardi and Raffaele Romano},
journal={Physical review letters},
year={2013},
volume={110 17},
pages={
170404
}
}
• Published 12 January 2013
• Philosophy, Physics
• Physical review letters
Recently, it has been argued that no extension of quantum theory can have improved predictive power under a strong assumption of free choice of the experimental settings and validity of quantum mechanics. Here, under a different free choice assumption, we describe a model which violates this statement for almost all states of a bipartite two-level system, in a possibly experimentally testable way. From consistency with quantum mechanics and the nonsignaling principle, we derive a bound on the…

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