Low-loss parallel-plate capacitor for superconducting quantum circuits

ORAL

Abstract

Many coherent superconducting devices utilize coplanar waveguide resonators and co-planar (lateral) capacitors to avoid significant electric field participation in lossy dielectric surfaces and interfaces. The trade-off is a much larger footprint per device. In this work, we present a relatively low-loss parallel-plate capacitor that has a specific capacitance (~12 fF/µm2) that is orders of magnitude higher than for coplanar capacitors. The capacitor features <2% cross-chip variability and a loss tangent of approximately 2E-5. We have demonstrated T1 times of 6-20 µs in flux qubits shunted with this parallel-plate capacitor for varying degrees of designed electric-field participation.

 

This material is based upon work supported by the Department of Defense under Air Force Contract No. FA8702-15-D-0001. Any opinions, findings, conclusions or recommendations expressed in this material are those of the author(s) and do not necessarily reflect the views of the Department of Defense.

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Presenters

  • Alexander Melville

    • MIT Lincoln Laboratory
    • MIT Lincoln Lab

Authors

  • Alexander Melville

    • MIT Lincoln Laboratory
    • MIT Lincoln Lab

  • Wayne Woods

    • MIT Lincoln Lab

  • Kyle Serniak

    • MIT Lincoln Lab
    • MIT Lincoln Laboratory

  • Evan Golden

    • MIT Lincoln Laboratory

  • David K Kim

    • MIT Lincoln Lab
    • MIT Lincoln Laboratory

  • Bethany M Niedzielski

    • MIT Lincoln Lab
    • MIT Lincoln Laboratory

  • Kaidong Peng

    • Massachusetts Institute of Technology MIT
    • Massachusetts Institute of Technology MI
    • Massachusetts Institute of Technology (MIT)

  • Kevin P O'Brien

    • Massachusetts Institute of Technology MIT
    • Massachusetts Institute of Technology (MIT)

  • Jonilyn L Yoder

    • MIT Lincoln Lab
    • MIT Lincoln Laboratory

  • Mollie E Schwartz

    • MIT Lincoln Lab
    • MIT Lincoln Laboratory

  • William D Oliver

    • Massachusetts Institute of Technology MIT
    • Massachusetts Institute of Technology Department of Electrical Engineering and Computer Science, Massachusetts Institute of Technology Research Laboratory of Electronics
    • MIT Lincoln Laboratory and Department of Electrical Engineering & Computer Science and Department of Physics, Massachusetts Institute of Technology