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RESEARCH PRODUCT
Detector's quantum backaction effects on a mesoscopic conductor and fluctuation-dissipation relation
L. MagazzùD. ValentiB. SpagnoloT. MartinG. FalciE. Paladinosubject
fluctuation-dissipation relationfluctuation-dissipation relation; mesoscopic conductor; Quantum backaction; quantum Langevin equation; Physics and Astronomy (all)Physics and Astronomy (all)quantum Langevin equationQuantum backaction mesoscopic conductor quantum Langevin equation fluctuation-dissipation relation.Quantum backactionmesoscopic conductorSettore FIS/03 - Fisica Della Materia[PHYS.COND.CM-MSQHE]Physics [physics]/Condensed Matter [cond-mat]/Mesoscopic Systems and Quantum Hall Effect [cond-mat.mes-hall]description
International audience; 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.
| year | journal | country | edition | language |
|---|---|---|---|---|
| 2017-06-01 |