Fast RF-only tuneup of quantum dot systems using multiplexed GHz CPW resonators*

Radio-Frequency (RF) sensing is a fast and scalable tool for measuring mesoscopic semiconductor and hybrid devices. We implement a combination of capacitively and galvanically coupled Co-Planar Waveguide (CPW) resonators in a multi-quantum-dot InAs nanowire device and characterize it without the aid of DC measurement. Notably, we extract high frequency conductance without calibration from DC data. Furthermore, we demonstrate multiplexed measurement of a charge stability diagram using this resonator and resonators capacitively coupled to two dots. These resonators are optimized for visibility of dispersive shifts imparted by electron charge transitions, leading to signal-to-noise ratios exceeding 10 for 1 microsecond integration times.