Please use this identifier to cite or link to this item: http://hdl.handle.net/2445/9562
Title: Universality of optimal measurements
Author: Tarrach, R., 1948-
Vidal Bonafont, Guifré
Keywords: Teoria quàntica
Quantum mechanics
Issue Date: 1999
Publisher: The American Physical Society
Abstract: We present optimal and minimal measurements on identical copies of an unknown state of a quantum bit when the quality of measuring strategies is quantified with the gain of information (Kullback-or mutual information-of probability distributions). We also show that the maximal gain of information occurs, among isotropic priors, when the state is known to be pure. Universality of optimal measurements follows from our results: using the fidelity or the gain of information, two different figures of merits, leads to exactly the same conclusions for isotropic distributions. We finally investigate the optimal capacity of N copies of an unknown state as a quantum channel of information.
Note: Reproducció digital del document publicat en format paper, proporcionada per PROLA i http://dx.doi.org/10.1103/PhysRevA.60.R3339
It is part of: Physical Review A, 1999, vol. 60, núm. 5, p. R3339 - R3342.
URI: http://hdl.handle.net/2445/9562
ISSN: 1050-2947
Appears in Collections:Articles publicats en revistes (Física Quàntica i Astrofísica)

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