General Theory of Overmeasurement of Discrete Quantum Observables and Application to Simultaneous Measurement
Abstract
A complete theory of overmeasurement by measuring refinements of observables is presented. It encompasses a wider set of functions of observ- ables (coarsenings) . Thus the theory has a broad potential application.It is applied to a thorough investigation of simultaneous measurements. In partic- ular, the set of all simultaneous measurements for a given pair of compatible observables is determined.
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