Non-locality, Contextuality and Transition sets

Details Non-locality, Contextuality and Transition sets Non-locality, Contextuality and Transition sets

2007-11-16

arxiv.org/abs/0711.2653v1

Physics

Quantum Physics

17 pages. 4 figures. Latex

Scientific paper

We discuss quantum non-locality and contextuality using the notion of transition sets. This approach provides a way to obtain a direct logical contradiction with locality/non-contextuality in the EPRB gedanken experiment as well as a clear graphical illustration of what violations of Bell inequalities quantify. In particular, we show graphically how these violations are related to measures of non-local transition sets. We also introduce a new form of contextuality, {\em measurement ordering contextuality}, i.e. there exists commuting operators $\hat{\mathcal{A}}$ and $\hat{\mathcal{B}}$ such that the outcome for $\hat{\mathcal{A}}$ depends on whether we measured $\hat{\mathcal{B}}$ before or after $\hat{\mathcal{A}}$. It is shown (excluding retro-causal and/or conspiratorial theories) that any hidden variable theory capable of reproducing the quantum statistics has to have this property. This generalizes yet another feature of the hidden variable theory of deBroglie and Bohm.

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