Abstract
Various axiomatic models for unsharp quantum measurements are investigated. These include effect spaces (E-spaces), effect test spaces (E-test spaces), effect algebras, and test groups. It is shown that a test group G is the universal group of an E-test space if and only if G is strongly atomistic. It follows that if G is strongly atomistic, then G is an interpolation group. We then demonstrate that if G is an interpolation group, then G is the universal group of an E-space. Finally, it is shown that an E-space is isomorphic to an E-test space if and only if it is strongly atomistic.
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Gudder, S. Universal Groups of Effect Spaces. Foundations of Physics 29, 409–422 (1999). https://doi.org/10.1023/A:1018818915935
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DOI: https://doi.org/10.1023/A:1018818915935