Controlling Surface Oxidation of Superconducting Circuit Materials

ORAL

Abstract

Achieving large-scale quantum computations with superconducting quantum circuits, particularly those based on transmon qubits, demands significant improvements in qubit coherence time. In recent advancements, tantalum (Ta) has emerged as a leading candidate, outperforming traditional counterparts in terms of coherence time. Despite its promise, the presence of an amorphous surface Ta oxide layer poses a challenge, potentially introducing dielectric loss and limiting the coherence time. In this talk, we will present a novel approach for suppressing the formation of surface Ta oxide, aiming to unlock the full potential of Ta-based quantum circuits for high-performance quantum computing applications.

*This research was supported by the U.S. Department of Energy (DOE), Office of Science (SC), National Quantum Information Science Research Centers (NQISRCs), Co-design Center for Quantum Advantage (C2QA) under contract number DE-SC0012704.

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Publication: Zhou, C., Mun, J., Yao, J., Hossain, M. D., McLellan, R. A., Li, R., ... & Liu, M. (2023). Ultrathin Magnesium-based Coating as an Efficient Oxygen Barrier for Superconducting Circuit Materials. arXiv preprint arXiv:2309.12603.

Presenters

  • Chenyu Zhou

    • Brookhaven National Laboratory (BNL)

Authors

  • Chenyu Zhou

    • Brookhaven National Laboratory (BNL)

  • Junsik Mun

    • Brookhaven National Laboratory

  • Juntao Yao

    • Stony Brook University

  • Aswin kumar Anbalagan

    • Brookhaven National Laboratory

  • Mohammad D Hossain

    • Pacific Northwest National Laboratory

  • Russell A McLellan

    • Princeton University

  • Ruoshui Li

    • Brookhaven National Laboratory

  • Kim Kisslinger

    • BNL
    • Brookhaven National Laboratory

  • Gengnan Li

    • Brookhaven National Laboratory

  • Xiao Tong

    • Brookhaven National Laboratory

  • Ashley R Head

    • Brookhaven National Laboratory

  • Conan Weiland

    • Brookhaven National Laboratory
    • National Institute of Standard and Technology

  • Steven L Hulbert

    • Brookhaven National Laboratory

  • Andrew L Walter

    • Brookhaven National Laboratory

  • Qiang Li

    • Stony Brook University (SUNY)

  • Yimei Zhu

    • Brookhaven National Laboratory

  • Peter V Sushko

    • Pacific Northwest National Laboratory

  • Mingzhao Liu

    • Brookhaven National Laboratory