Informational power of quantum measurements

Details Informational power of quantum measurements Informational power of quantum measurements

2011-03-10

arxiv.org/abs/1103.1972v2

Phys. Rev. A 83, 062304 (2011)

Physics

Quantum Physics

9 pages, 3 figures, added references, published version

Scientific paper

We introduce the informational power of a quantum measurement as the maximum amount of classical information that the measurement can extract from any ensemble of quantum states. We prove the additivity by showing that the informational power corresponds to the classical capacity of a quantum-classical channel. We restate the problem of evaluating the informational power as the maximization of the accessible information of a suitable ensemble. We provide a numerical algorithm to find an optimal ensemble, and quantify the informational power.

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