Counting statistics and detector properties of quantum point contacts

Details Counting statistics and detector properties of quantum point contacts Counting statistics and detector properties of quantum point contacts

2005-05-26

arxiv.org/abs/cond-mat/0505647v2

Phys. Rev. Lett. 95, 126803 (2005)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

4 pages, 2 figures, published version

Scientific paper

10.1103/PhysRevLett.95.126803

Quantum detector properties of the quantum point contact (QPC) are analyzed for 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.

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