Counting statistics and detector properties of quantum point contacts

被引:75
作者
Averin, DV [1 ]
Sukhorukov, EV
机构
[1] SUNY Stony Brook, Dept Phys & Astron, Stony Brook, NY 11794 USA
[2] Univ Geneva, Dept Phys Theor, CH-1211 Geneva, Switzerland
基金
美国国家科学基金会;
关键词
D O I
10.1103/PhysRevLett.95.126803
中图分类号
O4 [物理学];
学科分类号
0702 ;
摘要
Quantum detector properties of the quantum point contact (QPC) are analyzed for an arbitrary electron transparency and coupling strength to the measured system and are shown to be determined by the electron counting statistics. Conditions of the quantum-limited operation of the QPC detector, which prevent information loss through the scattering time and scattering phases, are found for arbitrary coupling. We show that the phase information can be restored and used for the quantum-limited detection by inclusion of the QPC detector in the electronic Mach-Zehnder interferometer.
引用
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页数:4
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