Fast Single-Charge Sensing with an rf Quantum Point Contact

Details Fast Single-Charge Sensing with an rf Quantum Point Contact Fast Single-Charge Sensing with an rf Quantum Point Contact

2007-07-19

arxiv.org/abs/0707.2946v2

Appl. Phys. Lett. 91, 162101 (2007)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

related papers available at http://marcuslab.harvard.edu

Scientific paper

10.1063/1.2794995

We report high-bandwidth charge sensing measurements using a GaAs quantum point contact embedded in a radio frequency impedance matching circuit (rf-QPC). With the rf-QPC biased near pinch-off where it is most sensitive to charge, we demonstrate a conductance sensitivity of 5x10^(-6) e^(2)/h Hz^(-1/2) with a bandwidth of 8 MHz. Single-shot readout of a proximal few-electron double quantum dot is investigated in a mode where the rf-QPC back-action is rapidly switched.

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