Universal detector efficiency of a mesoscopic capacitor
Mesoscale and Nanoscale Physics
2010-04-22 v1
Abstract
We investigate theoretically a novel type of high frequency quantum detector based on the mesoscopic capacitor recently realized by Gabelli et al., [Science {\bf 313}, 499 (2006)], which consists of a quantum dot connected via a single channel quantum point contact to a single lead. We show that the state of a double quantum dot charge qubit capacitively coupled to this detector can be read out in the GHz frequency regime with near quantum limited efficiency. To leading order, the quantum efficiency is found to be universal owing to the universality of the charge relaxation resistance of the mesoscopic capacitor.
Cite
@article{arxiv.0902.0686,
title = {Universal detector efficiency of a mesoscopic capacitor},
author = {Simon E. Nigg and Markus Buttiker},
journal= {arXiv preprint arXiv:0902.0686},
year = {2010}
}
Comments
4 pages, 2 figures, submitted to PRL