Phys. Rev. Lett. 66, 1119–1122 (1991)Optimal detection of quantum informationReceived 15 February 1990; published in the issue dated 4 March 1991 Two quantum systems are identically prepared in different locations. An observer’s task is to determine their state. A simple example shows that a pair of measurements of the von Neumann type is less effective than a sequence of nonorthogonal probability-operator measures, alternating between the two quantum systems. However, the most efficient set of operations of that type that we were able to design falls short of a single combined measurement, performed on both system together. © 1991 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevLett.66.1119
DOI:
10.1103/PhysRevLett.66.1119
PACS:
03.65.Bz, 89.70.+c
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