Hydrogen as a Source of Flux Noise in SQUIDs

POSTER

Abstract


Superconducting qubits are hampered by flux noise produced by fluctuating surface spins from a variety of microscopic sources. Recent experiments indicated that hydrogen (H) atoms may be one of those sources. Using density functional theory calculations, we found sizeable magnetic moments arising from H atoms either embedded in, or adsorbed on, an α-Al2O3(0001) surface. We also find that H adatoms on the surface attract gas molecules such as O2, producing new spin sources. We propose to use a coating layer (e.g., graphene) to eliminate the H-induced magnetization.

Presenters

  • Ruqian Wu

    Univ of California - Irvine, Department of Physics and Astronomy, Univ of California - Irvine, University of California, Irvine, Department of Physics and Astronomy, University of California, Irvine, Physics, Univ of California - Irvine

Authors

  • Ruqian Wu

    Univ of California - Irvine, Department of Physics and Astronomy, Univ of California - Irvine, University of California, Irvine, Department of Physics and Astronomy, University of California, Irvine, Physics, Univ of California - Irvine

  • Zhe Wang

    Department of Physics , Fudan University

  • Hui Wang

    Univ of California - Irvine, Department of Physics and Astronomy, Univ of California - Irvine, Physics, Univ of California - Irvine

  • Clare Yu

    Physics and Astronomy, Univ of California - Irvine, Department of Physics and Astronomy, Univ of California - Irvine