Universal detector efficiency of a mesoscopic capacitor

Details Universal detector efficiency of a mesoscopic capacitor Universal detector efficiency of a mesoscopic capacitor

2009-02-04

arxiv.org/abs/0902.0686v1

Phys.Rev.Lett.102:236801,2009

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

4 pages, 2 figures, submitted to PRL

Scientific paper

10.1103/PhysRevLett.102.236801

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.

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