Informational power of quantum measurements

Informational power of quantum measurements

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-classi...

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Veröffentlicht in:Physical review. A, Atomic, molecular, and optical physics Atomic, molecular, and optical physics, 2011-06, Vol.83 (6), Article 062304
Hauptverfasser: Dall’Arno, Michele, D’Ariano, Giacomo Mauro, Sacchi, Massimiliano F.
Format: Artikel
Sprache:eng
Schlagworte:
ALGORITHMS
CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS
INFORMATION
MATHEMATICAL LOGIC
MEASURING METHODS
QUANTUM STATES
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container_issue 6
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container_title Physical review. A, Atomic, molecular, and optical physics
container_volume 83
creator Dall’Arno, Michele
D’Ariano, Giacomo Mauro
Sacchi, Massimiliano F.
description 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.
doi_str_mv 10.1103/PhysRevA.83.062304
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subjects ALGORITHMS
CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS
INFORMATION
MATHEMATICAL LOGIC
MEASURING METHODS
QUANTUM STATES
title Informational power of quantum measurements
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