Physics – Quantum Physics
Scientific paper
2001-11-21
PRL (88) 130401 (2002)
Physics
Quantum Physics
4 pages, no figures
Scientific paper
10.1103/PhysRevLett.88.130401
The invariant information introduced by Brukner and Zeilinger, Phys. Rev. Lett. 83, 3354 (1999), is reconsidered from the point of view of quantum state estimation. We show that it 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 corresponding quantity loses its invariant character.
Hradil Zdenek
Rehacek Jaroslav
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