Quantum state discrimination

被引：390

作者：

Chefles, A ^{[1
]}

机构：

[1] Univ Hertfordshire, Dept Phys Sci, Hatfield AL10 9AB, Herts, England

来源：

CONTEMPORARY PHYSICS | 2000年 / 41卷 / 06期

关键词：

D O I：

10.1080/00107510010002599

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

There are fundamental limits to the accuracy with which one can determine the state of a quantum system. I give an overview of the main approaches to quantum state discrimination. Several strategies exist. In quantum hypothesis testing, a quantum system is prepared in a member of a known, finite set of states, and the aim is to guess which one with the minimum probability of error. Error free discrimination is also sometimes possible, if we allow for the possibility of obtaining inconclusive results. If no prior information about the state is provided, then it is impractical to try to determine it exactly, and it must be estimated instead. In addition to reviewing these various strategies, I describe connections between state discrimination, the manipulation of quantum entanglement and quantum cloning. Recent experimental work is also discussed.

引用

页码：401 / 424

页数：24

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