Using entanglement improves the precision of quantum measurements

被引：214

作者：

D'Ariano, GM

Lo Presti, P

Paris, MGA

机构：

[1] Univ Pavia, Quantum Opt & Informat Grp, I-27100 Pavia, Italy

[2] Univ Pavia, Ist Nazl Fis Mat, Dipartimento Fis A Volta, I-27100 Pavia, Italy

[3] Ist Nazl Fis Nucl, Sez Pavia, I-27100 Pavia, Italy

[4] Northwestern Univ, Dept Elect & Comp Engn, Evanston, IL 60208 USA

来源：

PHYSICAL REVIEW LETTERS | 2001年 / 87卷 / 27期

关键词：

Algorithms - Computational methods - Gaussian noise (electronic) - Matrix algebra - Photons - Probability distributions - Vectors;

D O I：

10.1103/PhysRevLett.87.270404

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

We show how entanglement can be used to improve the estimation of an unknown transformation. Using entanglement is always of benefit in improving either the precision or, the stability of the measurement. Examples relevant for applications are illustrated, for either qubits or continuous variables.

引用

页码：270404 / 270404

页数：4

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