Invariant information and quantum state estimation

被引：29

作者：

Rehácek, J ^{[1
]}

Hradil, Z ^{[1
]}

机构：

[1] Palacky Univ, Dept Opt, 17 Listopadu 50, Olomouc 77200, Czech Republic

来源：

PHYSICAL REVIEW LETTERS | 2002年 / 88卷 / 13期

关键词：

D O I：

10.1103/PhysRevLett.88.130401

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

The invariant information, introduced by . Brukner and A. Zeilinger [Phys. Rev. Lett. 83, 3354 ( 1999)], is reconsidered from the point of view of quantum state estimation. We show that this quantity is directly related to the mean error of the standard reconstruction from the measurement of a complete set of mutually complementary observables. We give its generalization in terms of the Fisher information. Provided that the optimum reconstruction is adopted, the information loses its invariant character.

引用

页数：4

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