TY - JOUR
T1 - Detector's quantum backaction effects on a mesoscopic conductor and fluctuation-dissipation relation
AU - Valenti, Davide
AU - Spagnolo, Bernardo
AU - Magazzù, Luca
AU - Martin, Thierry
AU - Paladino, Elisabetta
AU - Spagnolo, Bernardo
AU - Falci, Giuseppe
PY - 2017
Y1 - 2017
N2 - 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.
AB - 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.
UR - http://hdl.handle.net/10447/237016
UR - http://onlinelibrary.wiley.com/doi/10.1002/prop.201600059/full
M3 - Article
VL - 65
SP - 1
EP - 10
JO - Fortschritte der Physik
JF - Fortschritte der Physik
SN - 0015-8208
ER -