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Quantum Instruments and Related Transformation Valued Functions

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Abstract

The notion of an instrument in the quantum theory of measurement is studied in the context of transformation valued linear maps on von Neumann algebras and their *-subalgebras. An extension theorem is proved which yields among other things characterizations of the Fourier transforms of instruments and their noncommutative analogues. As an application, an ergodic type theorem for a general class of transformation valued functions on a locally compact group is obtained.

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  1. Department of Mathematics, University of Turku, 20014, Turku, Finland

    Kari Ylinen

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  1. Kari Ylinen
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Ylinen, K. Quantum Instruments and Related Transformation Valued Functions. Found Phys 39, 656–675 (2009). https://doi.org/10.1007/s10701-009-9294-9

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