Parameter Estimation of Quantum Channels

被引：96

作者：

Ji, Zhengfeng ^{[1
]}

Wang, Guoming ^{[1
]}

Duan, Runyao ^{[1
]}

Feng, Yuan ^{[1
]}

Ying, Mingsheng ^{[1
]}

机构：

[1] Tsinghua Univ, Dept Comp Sci & Technol, State Key Lab Intelligent Technol & Syst, Beijing 100084, Peoples R China

来源：

IEEE TRANSACTIONS ON INFORMATION THEORY | 2008年 / 54卷 / 11期

基金：

中国国家自然科学基金;

关键词：

Heisenberg limit; parameter estimation; programmable gates; quantum channels; standard quantum limit;

D O I：

10.1109/TIT.2008.929940

中图分类号：

TP [自动化技术、计算机技术];

学科分类号：

0812 ;

摘要：

The efficiency of parameter estimation of quantum channels is studied in this paper. We introduce the concept of programmable parameters to the theory of estimation. It is found that programmable parameters obey the standard quantum limit strictly; hence, no speedup is possible in its estimation. We also construct a class of nonunitary quantum channels whose parameter can be estimated in a way that the standard quantum limit is broken. The study of estimation of general quantum channels also enables an investigation of the effect of noises on quantum estimation.

引用

页码：5172 / 5185

页数：14

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