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

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

arxiv: 1502.01283 · v1 · pith:VG6V46DDnew · submitted 2015-02-04 · ❄️ cond-mat.mes-hall

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 This is my paper

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keywords chargeparametrictimeacquireamplifierdoublefasthigh

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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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