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BERNARDO SPAGNOLO

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

  • Autori: Magazzù, L.; Valenti, D.; Spagnolo, B.; Martin, T.; Falci, G.; Paladino, E.
  • Anno di pubblicazione: 2017
  • Tipologia: Articolo in rivista (Articolo in rivista)
  • OA Link: http://hdl.handle.net/10447/237016

Abstract

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.