Improving qubit performance through engineering of the substrate-Josephson junction interface.

ORAL

Abstract

The performance of a superconducting qubit is often limited by dissipation and two-level systems (TLS) losses. The dominant sources of these losses are believed to originate from interfaces and surfaces, likely as a result of fabrication processes, materials, or atmospheric exposure. We show an example of a chemical surface treatment that modifies the Josephson Junction-substrate interface, resulting in statistically significant improvement in T1 (>25% improvement) and a reduction in the density of strongly-coupled TLS. As this treatment primarily modifies the Josephson junction-substrate interface, we perform targeted chemical, and structural characterizations of that interface and correlate those with qubit measurements.

*This material is based upon work supported by the U.S. Department of Energy, Office of Science, National Quantum Information Science Research Centers, Superconducting Quantum Materials and Systems Center (SQMS) under contract number DE-AC02-07CH11359.

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Presenters

  • Cameron J Kopas

    • Rigetti Quantum Computing
    • Rigetti Computing, Inc.

Authors

  • Cameron J Kopas

    • Rigetti Quantum Computing
    • Rigetti Computing, Inc.

  • Dominic P Goronzy

    • Northwestern University

  • Thang T Pham

    • Northwestern University

  • Carlos G G Torres Castanedo

    • Northwestern University

  • Matthew M Cheng

    • Northwestern University

  • Hilal Cansizoglu

    • Rigetti Computing
    • Rigetti Computing, Inc.

  • Rory Cochrane

    • Rigetti Computing, Ins.
    • Rigetti Quantum Computing

  • Burcu Ercan

    • Rigetti Quantum Computing

  • Jin-Su Oh

    • Ames Laboratory

  • Akshay A Murthy

    • Fermilab
    • Fermi National Accelerator Laboratory

  • Ella O Lachman

    • Rigetti Computing, Inc.
    • Rigetti Quantum Computing
    • Rigetti

  • Alexander Romanenko

    • Fermilab
    • Fermi National Accelerator Laboratory

  • Anna Grassellino

    • Fermilab
    • Fermi National Accelerator Laboratory

  • Matthew J Kramer

    • Ames National Laboratory

  • Lin Zhou

    • Ames National Laboratory

  • Michael J Bedzyk

    • Northwestern University

  • Josh Y Mutus

    • Rigetti Computing, Inc.
    • Rigetti Quantum Computing
    • Rigetti Computing Inc

  • Vinayak P Dravid

    • Northwestern University

  • Mark C Hersam

    • Northwestern University

  • Kameshwar Yadavalli

    • Rigetti Quantum Computing