Quantum-limited measurement and information in mesoscopic detectors

被引：120

作者：

Clerk, AA ^{[1
]}

Girvin, SM

Stone, AD

机构：

[1] Yale Univ, Dept Appl Phys, New Haven, CT 06511 USA

[2] Yale Univ, Dept Phys, New Haven, CT 06511 USA

来源：

PHYSICAL REVIEW B | 2003年 / 67卷 / 16期

基金：

美国国家科学基金会;

关键词：

D O I：

10.1103/PhysRevB.67.165324

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

We formulate general conditions necessary for a linear-response detector to reach the quantum limit of measurement efficiency, where the measurement-induced dephasing rate takes its minimum possible value. These conditions are applicable to both noninteracting and interacting systems. We assess the status of these requirements in an arbitrary noninteracting scattering-based detector, identifying the symmetries of the scattering matrix needed to reach the quantum limit. We show that these conditions are necessary to prevent the existence of information in the detector that is not extracted in the measurement process.

引用

页数：12

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