Characterization of Transmon Qubits with Low-loss Parallel Plate Capacitors

ORAL

Abstract

We have developed Al-AlOx-Al capacitors for use in superconducting circuits. They offer high specific capacitance (~12 fF/µm2), low loss (tan?? ~ 2x10-6), high reproducibility (<2% over 2" wafer), and allow for a large reduction in footprint relative to traditional co-planar (lateral) capacitors. In this talk we discuss the coherence properties and two-level system (TLS) densities of transmon qubits fabricated with varying degrees of low-loss parallel plate capacitor participation, and the implications for using these types of capacitors in qubits and other superconducting quantum circuits.

*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

  • Katrina M Sliwa

    • MIT Lincoln Lab

Authors

  • Katrina M Sliwa

    • MIT Lincoln Lab

  • Alexander Melville

    • MIT Lincoln Laboratory

  • Wayne Woods

    • MIT Lincoln Lab

  • Kyle Serniak

    • MIT Lincoln Laboratory

  • Thomas M Hazard

    • MIT Lincoln Lab
    • MIT Lincoln Laboratory

  • Evan Golden

    • MIT LIncoln Lab
    • MIT Lincoln Lab
    • MIT Lincoln Laboratory

  • David K Kim

    • MIT Lincoln Lab
    • MIT Lincoln Laboratory

  • Bethany M Niedzielski

    • MIT Lincoln Lab
    • MIT Lincoln Laboratory

  • Michael A Gingras

    • MIT Lincoln Lab
    • MIT Lincoln Laboratory

  • Kaidong Peng

    • Massachusetts Institute of Technology MIT
    • MIT

  • Kevin P O'Brien

    • Massachusetts Institute of Technology MIT
    • Massachusetts Institute of Technology
    • Massachusetts Institute of Technology MI

  • Jonilyn L Yoder

    • MIT Lincoln Lab
    • MIT Lincoln Laboratory

  • Mollie E Schwartz

    • MIT Lincoln Laboratory

  • William D Oliver

    • Massachusetts Institute of Technology MIT
    • Massachusetts Institute of Technology (MIT), MIT Lincoln Laboratory
    • Massachusetts Institute of Technology (MIT)
    • Massachusetts Institute of Technology
    • Massachusetts Institute of Technology, MIT Lincoln Laboratory