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arXiv · 1502.01283

Fast charge sensing of a cavity-coupled double quantum dot using a Josephson parametric amplifier

J. Stehlik·Y. -Y. Liu·C. M. Quintana·C. Eichler·T. R. Hartke·J. R. Petta
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Abstract

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.

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J. Stehlik, Y. -Y. Liu, C. M. Quintana, C. Eichler, T. R. Hartke, J. R. Petta. 2015-02-04. Fast charge sensing of a cavity-coupled double quantum dot using a Josephson parametric amplifier. https://doi.org/10.1103/physrevapplied.4.014018

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