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Minimal optimal generalized quantum measurements

Abstract

Optimal and finite positive operator valued measurements on a finite number NN of identically prepared systems have been presented recently. With physical realization in mind we propose here optimal and minimal generalized quantum measurements for two-level systems. We explicitly construct them up to N=7 and verify that they are minimal up to N=5. We finally propose an expression which gives the size of the minimal optimal measurements for arbitrary NN.Comment: 9 pages, Late

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