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bohm2
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Another theorem ruling out ψ-epistemic models:
http://arxiv.org/pdf/1412.0669.pdfWhile it is always possible to contrive ψ-epistemic toy models for PBR-type experiments, any full-blown ontological theory which allows arbitrary composition of (sub)systems is necessarily ψ-ontic. We consider this theorem to provide a more convincing case for the reality of the quantum state on the basis that, in light of Bell's theorem, it is known that any ontological theory that accounts for the predictions of quantum theory will necessarily have non-local correlations at the ontological level (as in Bohmian mechanics, for example). This theorem proves ψ-ontology even allowing for non-local correlations in the global ontic state.