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

Davide Valenti, Bernardo Spagnolo, Luca Magazzù, Thierry Martin, Elisabetta Paladino, Bernardo Spagnolo, Giuseppe Falci

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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.
Lingua originaleEnglish
pagine (da-a)1-10
Numero di pagine10
RivistaFortschritte der Physik
Stato di pubblicazionePublished - 2017


All Science Journal Classification (ASJC) codes

  • Physics and Astronomy(all)

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