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
        }
}
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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