GianCarlo Ghirardi, Raffaele Romano
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 non-signalling principle, we derive bounds on the local averages for the family of deterministic ontological theories our model belongs to.
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http://arxiv.org/abs/1301.2695
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