16/07/02 20:29:22.88 6WAr0Pko.net
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[27]
URLﾘﾝｸ(arxiv.org)
Ontological models predictively inequivalent to quantum theory GianCarlo Ghirardi, Raffaele Romano
(Submitted on 12 Jan 2013 (v1), last revised 26 Apr 2013 (this version, v2))
Conclusions ? In this work we have proven that ontological models of quantum theory which are compatible with it, but possibly experimentally distinguishable from it, are possible.
（中略）
Finally, we have derived an explicit upper bound on the local averages of any deterministic ontological theory for quantum mechanics, when the system is given by a pair of qubits.
This constraint is determined by the requirements that:
(i) the theory respects the nonsignalling condition, when one takes into account the accessible part of λ, and
(ii) it is compatible with quantum mechanics, that is, its predictions are the standard ones when the full average over λ is performed.
In the case of general local measurements, our bound is optimal only for factorized or maximally entangled states.
For arbitrary entanglement, it is optimal when A?(a) = σz.