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|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 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.|
|Electronic Publication Date:||27-Jul-2015|
|Citation:||Stehlik, J, Liu, Y-Y, Quintana, CM, Eichler, C, Hartke, TR, Petta, JR. (2015). Fast Charge Sensing of a Cavity-Coupled Double Quantum Dot Using a Josephson Parametric Amplifier. PHYSICAL REVIEW APPLIED, 4 (10.1103/PhysRevApplied.4.014018|
|Type of Material:||Journal Article|
|Journal/Proceeding Title:||PHYSICAL REVIEW APPLIED|
|Version:||Final published version. Article is made available in OAR by the publisher's permission or policy.|
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