Counting statistics and detector properties of quantum point contacts

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 preve...

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Veröffentlicht in:arXiv.org 2005-09
Hauptverfasser: Averin, Dmitri V, Sukhorukov, Eugene V
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description 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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subjects Coupling
Mach-Zehnder interferometers
Point contact
Scattering
Sensors
title Counting statistics and detector properties of quantum point contacts
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