Fast charge sensing of a cavity-coupled double quantum dot using a Josephson parametric amplifier
Stehlik J, Liu YY, Quintana CM, Eichler C, Hartke TR, Petta JR (2015)
Publication Type: Journal article
Publication year: 2015
Journal
Book Volume: 4
Article Number: 014018
Journal Issue: 1
DOI: 10.1103/PhysRevApplied.4.014018
Abstract
We demonstrate fast readout of a double quantum dot (DQD) that is coupled to a superconducting resonator. Utilizing a parametric amplifier beyond its range of linear amplification, we improve the signal-to-noise ratio (SNR) by a factor of 2000 compared to the situation with the parametric amplifier turned off. With an integration time of 400 ns comparable to the inverse effective bandwidth, we achieve a SNR of 76. By measuring the SNR as a function of the integration time, we extract an equivalent charge sensitivity of 8×10-5 e/Hz. The high SNR allows us to acquire a DQD charge-stability diagram in just 20 ms. At such a high data rate, it is possible to acquire charge-stability diagrams in a live "video mode," enabling real-time tuning of the DQD confinement potential.
Authors with CRIS profile
Involved external institutions
United States (USA) (US)How to cite
APA:
Stehlik, J., Liu, Y.-Y., Quintana, C.M., Eichler, C., Hartke, T.R., & Petta, J.R. (2015). Fast charge sensing of a cavity-coupled double quantum dot using a Josephson parametric amplifier. Physical Review Applied, 4(1). https://dx.doi.org/10.1103/PhysRevApplied.4.014018
MLA:
Stehlik, J., et al. "Fast charge sensing of a cavity-coupled double quantum dot using a Josephson parametric amplifier." Physical Review Applied 4.1 (2015).
BibTeX: Download