PERIMETER INSTITUTE RECORDED SEMINAR ARCHIVE
 | PIRSA:08020052
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Measurement ordering contextuality and the search for psi-epistemic theories Speaker(s): Hans Westman
Abstract: We prove that all non-conspiratorial/retro-causal hidden variable theories has to be measurement ordering contextual, i.e. there exists
*commuting* operator pair (A,B) and a hidden state \\lambda such that the outcome of A depends on whether we measure B before or after.
Interestingly this rules out a recent proposal for a psi-epistemic due to Barrett, Hardy, and Spekkens. We also show that the model was in fact partly discovered already by vanFraassen 1973; the only thing missing was giving a probability distribution on the space of ontic states (the hidden variables).
Date: 26/02/2008 - 4:00 pm
Series: Quantum Foundations
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