Physics – Quantum Physics
Scientific paper
2004-09-03
Optics and Spectroscopy 99 (2005) 425-432
Physics
Quantum Physics
12 pages, revtex4
Scientific paper
10.1134/1.2055938
While a positive operator valued measure gives the probabilities in a quantum measurement, an instrument gives both the probabilities and the a posteriori states. By interpreting the instrument as a quantum channel and by using the typical inequalities for the quantum and classical relative entropies, many bounds on the classical information extracted in a quantum measurement, of the type of Holevo's bound, are obtained in a unified manner.
Barchielli Alberto
Lupieri Giancarlo
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