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

M. C. Cassidy; A. S. Dzurak; R. G. Clark; K. D. Petersson; I. Farrer; D. A. Ritchie; C. G. Smith

doi:10.1063/1.2809370

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

Mesoscale and Nanoscale Physics 2015-05-13 v1

Authors: M. C. Cassidy , A. S. Dzurak , R. G. Clark , K. D. Petersson , I. Farrer , D. A. Ritchie , C. G. Smith

View on arXiv ↗ PDF ↗ DOI ↗

Abstract

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.

Keywords

particle detector frequency comb spectroscopy detector readout electronics

Cite

@article{arxiv.0907.1010,
  title  = {Single Shot Charge Detection Using A Radio-Frequency Quantum Point Contact},
  author = {M. C. Cassidy and A. S. Dzurak and R. G. Clark and K. D. Petersson and I. Farrer and D. A. Ritchie and C. G. Smith},
  journal= {arXiv preprint arXiv:0907.1010},
  year   = {2015}
}

Comments

4 pages, 3 figures

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

Abstract

Keywords

Cite

Comments

Related papers