We demonstrate fast readout of a double quantum dot (DQD) that is coupled to a superconducting resonator. Utilizing parametric amplification in a nonlinear operational mode, 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 we achieve a SNR of 76. By studying SNR as a function of the integration time we extract an equivalent charge sensitivity of 8 x 10^{-5} e/root(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.
@article{arxiv.1502.01283,
title = {Fast charge sensing of a cavity-coupled double quantum dot using a Josephson parametric amplifier},
author = {J. Stehlik and Y. -Y. Liu and C. M. Quintana and C. Eichler and T. R. Hartke and J. R. Petta},
journal= {arXiv preprint arXiv:1502.01283},
year = {2015}
}