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A flea on Schroedinger's cat

Klaas Landsman ( Radboud University Nijmegen )

We propose a technical reformulation of the measurement problem of quantum mechanics, which is based on the postulate that the final state of a measurement is classical. This accords with experimental practice (as well as with Bohr's views), and admits a purely technical solution within the confines of conventional quantum theory. Our solution combines the technical and conceptual virtues of decoherence with those of dynamical collapse models, without sharing their drawbacks:  single measurement outcomes are obtained (as opposed to merely  diagonal reduced density matrices), and no modification of quantum mechanics is needed. The instability phenomenon in the theory of Schrödinger operators on which our solution is based was discovered in 1981 by Jona-Lasinio, Martinelli, and Scoppola.

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