Fluctuation theorem for a double quantum dot coupled to a point-contact electrometer

D. S. Golubev, Y. Utsumi, M. Marthaler, Gerd Schoen

Published 2011-05-16, updated 2011-08-15Version 2

We study single-electron transport through a double quantum dot (DQD) monitored by a capacitively coupled quantum point-contact (QPC) electrometer. We derive the full counting statistics for the coupled DQD - QPC system and obtain the joint probability distribution of the charges transferred through the DQD and the QPC consistent with the fluctuation theorem (FT). The system can be described by a master equation with tunneling rates depending of the counting fields and satisfying a generalized local detailed-balance relation. Furthermore, we derive universal relations between the non-linear corrections to the current and noise, which can be verified in experiment.