Information-tradeoff relations for finite-strength quantum measurements

被引：95

作者：

Fuchs, C.A. ^{[1
]}

Jacobs, K. ^{[1
]}

机构：

[1] Bell Laboratories, Lucent Technologies, Rm. 2C-420, 600-700 Mountain Ave., Murray Hill, NJ 07974, United States

来源：

Physical Review A. Atomic, Molecular, and Optical Physics | 2001年 / 63卷 / 06期

关键词：

Density (optical) - Encoding (symbols) - Feedback - Mathematical models - Quantum cryptography - Statistical methods;

D O I：

10.1103/PhysRevA.63.062305

中图分类号：

学科分类号：

摘要：

A way to quantify the notion that quantum measurements bring a disturbance to the system being measured is highlighted. It is shown how one observer among two observers can increase by measurement the purity of his density operator without affecting the purity of the other observer's.

引用

页码：1 / 062305