Phys. Rev. Lett. 88, 130401 (2002) [4 pages]Invariant Information and Quantum State EstimationReceived 30 November 2001; published 14 March 2002 The invariant information, introduced by Č. Brukner and A. Zeilinger [Phys. Rev. Lett. 83, 3354 (1999)], is reconsidered from the point of view of quantum state estimation. We show that this quantity is directly related to the mean error of the standard reconstruction from the measurement of a complete set of mutually complementary observables. We give its generalization in terms of the Fisher information. Provided that the optimum reconstruction is adopted, the information loses its invariant character. © 2002 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevLett.88.130401
DOI:
10.1103/PhysRevLett.88.130401
PACS:
03.65.Wj, 03.65.Ta, 03.67.-a, 89.70.+c
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