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.

Authors

  • B. Suri

    Dept. of Physics, University of Maryland, College Park

  • S. Novikov

    Dept. of Physics, University of Maryland, College Park

  • V. Zaretskey

    Dept. of Physics, University of Maryland, College Park

  • B.S. Palmer

    Laboratory for Physical Sciences, Lab for Physical Sciences, College Park, Maryland

  • F.C. Wellstood

    Physics Dept., University of Maryland, College Park, University of Maryland, JQI, CNAM, Department of Physics, University of Maryland, JQI, CNAM, Dept. of Phys, Univ of MD, College Park