Fabrication and Characterization of Aluminum Airbridges for Superconducting Qubit Circuits

ORAL

Abstract

Superconducting circuits based on coplanar waveguides (CPWs) are susceptible to parasitic slotline modes which can lead to loss and decoherence. We motivate the use of superconducting airbridges as a reliable method for preventing the propagation of these modes. We describe the fabrication of these airbridges on superconducting resonators, which we use to measure the loss due to placing airbridges over CPW lines. We find that the additional loss at single photon levels is small, and decreases at higher drive powers. These results pave the way for building airbridge crossovers on more complex qubit circuits.

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Authors

  • Zijun Chen

    • Univ of California - Santa Barbara

  • Anthony Megrant

    • Univ of California - Santa Barbara
    • UC Santa Barbara

  • J. Kelly

    • Univ of California - Santa Barbara
    • UC Santa Barbara

  • R. Barends

    • Univ of California - Santa Barbara
    • UC Santa Barbara

  • Joerg Bochmann

    • UC Santa Barbara
    • Univ of California - Santa Barbara

  • Yu Chen

    • Univ of California - Santa Barbara
    • UC - Santa Barbara

  • B. Chiaro

    • Univ of California - Santa Barbara
    • UC Santa Barbara

  • Andrew Dunsworth

    • Univ of California - Santa Barbara

  • Evan Jeffrey

    • Univ of California - Santa Barbara
    • UC Santa Barbara

  • Josh Mutus

    • Univ of California - Santa Barbara

  • Peter O'Malley

    • Univ of California - Santa Barbara
    • University of California, Santa Barbara

  • Charles Neill

    • Univ of California - Santa Barbara
    • UCSB

  • Pedram Roushan

    • Univ of California - Santa Barbara
    • University of California, Santa Barbara

  • Daniel Sank

    • Univ of California - Santa Barbara
    • UC Santa Barbara

  • Amit Vainsencher

    • UC Santa Barbara
    • Univ of California - Santa Barbara

  • Jim Wenner

    • Univ of California - Santa Barbara
    • University of California, Santa Barbara

  • Ted White

    • U.C. Santa Barbara
    • Univ of California - Santa Barbara

  • Andrew N. Cleland

    • UC Santa Barbara
    • Univ of California - Santa Barbara
    • UC Santa Barbara, USA

  • John Martinis

    • University of California, Santa Barbara
    • Univ of California - Santa Barbara
    • UC Santa Barbara
    • UC Santa Barbara, USA
    • Department of Physics, University of California, Santa Barbara, California 93106, USA