Abstract
It is argued that the measurement problem reduces to the problem of modeling quasi-classical systems in a modified quantum mechanics with superselection rules. A measurement theorem is proved, demonstrating, on the basis of a principle for selecting the quantities of a system that are determinate (i.e., have values) in a given state, that after a suitable interaction between a systemS and a quasi-classical systemM, essentially only the quantity measured in the interaction and the indicator quantity ofM are determinate. The theorem justifies interpreting the noncommutative algebra of observables of a quantum mechanical system as an algebra of “beables,” in Bell's sense.
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Bub, J. Measurement and “beables” in quantum mechanics. Found Phys 21, 25–42 (1991). https://doi.org/10.1007/BF01883561
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DOI: https://doi.org/10.1007/BF01883561