Generalized Observables, Bell’s Inequalities and Mixtures in the ESR Model for QM

Foundations of Physics 41 (3):424-449 (2011)

The extended semantic realism (ESR) model proposes a new theoretical perspective which embodies the mathematical formalism of standard (Hilbert space) quantum mechanics (QM) into a noncontextual framework, reinterpreting quantum probabilities as conditional instead of absolute. We provide in this review an overall view on the present status of our research on this topic. We attain in a new, shortened way a mathematical representation of the generalized observables introduced by the ESR model and a generalization of the projection postulate of elementary QM. Basing on these results we prove that the Bell-Clauser-Horne-Shimony-Holt (BCHSH) inequality, a modified BCHSH inequality and quantum predictions hold together in the ESR model because they refer to different parts of the picture of the physical world supplied by the model. Then we show that a new mathematical representation of mixtures must be introduced in the ESR model which does not coincide with the standard representation in QM and avoids some deep problems that arise from the representation of mixtures provided by QM. Finally we get a nontrivial generalization of the Lüders postulate, which is justified in a special case by introducing a reasonable physical assumption on the evolution of the compound system made up of the measured system and the measuring apparatus
Keywords Quantum mechanics  Quantum theory of measurement  Bell inequalities
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DOI 10.1007/s10701-010-9435-1
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References found in this work BETA

Against 'Realism'.Travis Norsen - 2007 - Foundations of Physics 37 (3):311-340.
Insolubility of the Quantum Measurement Problem for Unsharp Observables.Paul Busch & Abner Shimony - 1996 - Studies in History and Philosophy of Science Part B: Studies in History and Philosophy of Modern Physics 27 (4):397-404.

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The Quantum Harmonic Oscillator in the ESR Model.Sandro Sozzo - 2013 - Foundations of Physics 43 (6):792-804.

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