Abstract
The macroscopic observer is usually concerned not with one variable, but some set of variables, the operators for which as a rule do not commutate with one another. The question then arises of what and how one must measure to obtain the most information possible about the variables being studied. A natural criterion to specify the completeness of this data is the information criterion, defining the quality of the evaluation of the given set of variables. The present study will construct a formal equivalent of an instrument optimized with regard to the information criterion for simultaneous measurement of the specified set of noncommutating quantum variables.
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Translated from Izvestiya Vysshikh Uchebnykh Zavedenii, Fizika, No. 9, pp. 14–19, September, 1983.
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Vainshtein, V.D. Macroscopic measurement of noncommutating quantum variables. Soviet Physics Journal 26, 783–787 (1983). https://doi.org/10.1007/BF00891839
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DOI: https://doi.org/10.1007/BF00891839