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Article Dans Une Revue Fortschritte der Physik / Progress of Physics Année : 2017

Detector's quantum backaction effects on a mesoscopic conductor and fluctuation-dissipation relation

Résumé

When measuring quantum mechanical properties of charge transport in mesoscopic conductors, backaction effects occur. We consider a measurement setup with an elementary quantum circuit, composed of an inductance and a capacitor, as detector of the current flowing in a nearby quantum point contact. A quantum Langevin equation for the detector variable including backaction effects is derived. Differences with the quantum Langevin equation obtained in linear response are pointed out. In this last case, a relation between fluctuations and dissipation is obtained, provided that an effective temperature of the quantum point contact is defined.
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Dates et versions

hal-01663802 , version 1 (26-04-2018)

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Luca Magazzù, Davide Valenti, Bernardo Spagnolo, Thierry Martin, Giuseppe Falci, et al.. Detector's quantum backaction effects on a mesoscopic conductor and fluctuation-dissipation relation. Fortschritte der Physik / Progress of Physics, 2017, Special Issue: International Conference Frontiers of Quantum and Mesoscopic Thermodynamics Prague, Czech Republic 27 July– 1 August 2015, 65 (6-8), pp.1600059. ⟨10.1002/prop.201600059⟩. ⟨hal-01663802⟩
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