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Single Shot Charge Detection Using A Radio-Frequency Quantum Point Contact

We report on charge sensing measurements of a GaAs semiconductor quantum dot device using a radio frequency quantum point contact (rf-QPC). The rf-QPC is fully characterized at 4 K and milli-Kelvin temperatures and found to have a bandwidth exceeding 20 MHz. For single-shot charge sensing we achieve a charge sensitivity of 2x10^-4 e/(sqrt)Hz referred to the neighboring dot's charge. The rf-QPC compares favorably with rf-SET electrometers and promises to be an extremely useful tool for characterizing and measuring semiconductor quantum systems on fast timescales.

preprint2009arXivOpen access
M. C. CassidyA. S. DzurakR. G. ClarkK. D. PeterssonI. FarrerD. A. RitchieC. G. Smith
cond-mat.mes-hall
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Open access7 authors1 topic
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M. C. CassidyA. S. DzurakR. G. ClarkK. D. PeterssonI. FarrerD. A. RitchieC. G. Smith

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