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Incompatible and contradictory retrodictions in the history approach to quantum mechanics

Giulio Peruzzi, Alberto Rimini

quant-pharXiv:quant-ph/9710003

Abstract

We illustrate two simple spin examples which show that in the consistent histories approach to quantum mechanics one can retrodict with certainty incompatible or contradictory propositions corresponding to non-orthogonal or, respectively, orthogonal projections. V.2 vs. V1: The example previously quoted as "d'Espagnat's example" is now properly quoted as "Griffiths' example". A reference to a previous work by Aharonov and Vaidman is added.

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