Transmon qubit coupled to a quasi-lumped element resonator
ORAL
Abstract
We report on the design, fabrication and measurement of an Al/AlO$_{\mbox{x}}$/Al transmon qubit coupled to a quasi-lumped element superconducting resonator. Our resonator, which has a resonant frequency of $\approx 5.4\,$GHz, and a loaded quality factor $Q_l \approx 30,000$ is, in turn, coupled to a transmission line. The qubit is designed to have $E_J/E_c > 30$ to significantly decrease the sensitivity to low-frequency charge noise. The coupling of the qubit to the resonator is designed to be $g/2\pi> 100\, $MHz. We report and discuss preliminary spectroscopic measurements and coherence measurements of the qubit.
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