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atyy

Science Advisor

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Peres suggests that collapse can be replaced with coarse-graining. We know that collapse is verified by all experimental data to date, and that coarse-graining, if successful, must make exactly the same predictions as collapse. I think it is an interesting idea, but I have only ever seen it in Peres. Can coarse-graining without collapse successfully reproduce the predictions of quantum mechanics? In particular, can one do the coarse-graining without collapse explicitly and recover the correlations for the Bell tests? Is the coarse-graining in a Bell test a local procedure?