Informational power of quantum measurements

被引：44

作者：

Dall'Arno, Michele ^{[1
,2
]}

D'Ariano, Giacomo Mauro ^{[1
,2
]}

Sacchi, Massimiliano F. ^{[1
,3
]}

机构：

[1] Dipartimento Fis A Volta, Quit Grp, I-27100 Pavia, Italy

[2] Ist Nazl Fis Nucl, Grp 4, I-27100 Pavia, Italy

[3] Ist Foton & Nanotecnol INF CNR, I-20133 Milan, Italy

来源：

PHYSICAL REVIEW A | 2011年 / 83卷 / 06期

关键词：

ACCESSIBLE INFORMATION; CAPACITY;

D O I：

10.1103/PhysRevA.83.062304

中图分类号：

O43 [光学];

学科分类号：

070207 ; 0803 ;

摘要：

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.

引用

页数：8

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