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Existential Contextuality and the Models of Meyer, Kent and Clifton
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It is shown that the models recently proposed by Meyer, Kent and Clifton (MKC) exhibit a novel kind of contextuality, which we term existential contextuality. In this phenomenon it is not simply the pre-existing value but the actual existence of an observable which is context dependent. This result confirms the point made elsewhere, that the MKC models do not, as the authors claim, ``nullify'' the Kochen-Specker theorem. It may also be of some independent interest.
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Quantum Memory Advantage from Contextuality
Quantum automata solve exclusivity-graph promise problems with dimension O(n) versus classical 2^Omega(n) states via representational contextuality, maintaining O(1) noise threshold.
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