Abstract
An explicit formula is obtained for the entropy defect and the (maximum) information for an ensemble of two pure quantum states; an optimal basis is found, that is, an optimal measurement procedure which enables one to obtain the maximum information. Some results are also presented for the case of two mixed states, described by second-order density matrices (for example, spin polarization matrices). It is shown that in the case of two states the optimal measurement is a direct von Neumann measurement performed in the subspace of the two states.
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Levitin, L.B. Entropy defect and information for two quantum states. Open Syst Inf Dyn 2, 319–329 (1994). https://doi.org/10.1007/BF02228857
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DOI: https://doi.org/10.1007/BF02228857