Single Shot Charge Detection Using A Radio-Frequency Quantum Point Contact
Cassidy, M. C.
Dzurak, A. S.
Clark, R. G.
Petersson, K. D.
Ritchie, D. A.
Smith, C. G.
Condensed Matter - Mesoscale and Nanoscale Physics
arxiv: Condensed Matter::Mesoscopic Systems and Quantum Hall Effect
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.