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Surface spin induced 1/<i>f</i> flux noise dependent on SQUID geometry (2)

ORAL

Abstract

The dominant source of decoherence in frequency tunable superconducting qubits is 1/f flux noise, presumably originating from local magnetic spin impurities located at the surface of their SQUID loops. Here, we measure the flux noise amplitudes of capacitively shunted flux qubits and study their dependence on geometric parameters of their SQUID loops. Our data show good agreement with a previously presented microscopic model for independent spin impurities which has so far eluded experimental verification. We discuss limitations of the proposed model for superconducting films of finite thickness and provide numerical simulations of the current distribution in our SQUIDs, which can refine the considered model. Finally, we apply and confirm our results by observing consistently low flux noise amplitudes in samples with optimized SQUID parameters – small perimeters and large wire widths.

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Presenters

  • Jochen Braumueller

    Massachusetts Institute of Technology MIT, Research Laboratory of Electronics, Massachusetts Institute of Technology, Massachusetts Institute of Technology

Authors

  • Jochen Braumueller

    Massachusetts Institute of Technology MIT, Research Laboratory of Electronics, Massachusetts Institute of Technology, Massachusetts Institute of Technology

  • Leon Ding

    Massachusetts Institute of Technology MIT, Research Laboratory of Electronics, Massachusetts Institute of Technology

  • Antti Vepsalainen

    Research Laboratory of Electronics, Massachusetts Institute of Technology, Research Laboratory of Electronics, Massachusetts Institute of Technology MIT, Massachusetts Institute of Technology MIT

  • Youngkyu Sung

    Research Laboratory of Electronics, Massachusetts Institute of Technology MIT, Massachusetts Institute of Technology MIT, Research Laboratory of Electronics, Massachusetts Institute of Technology, Massachusetts Institute of Technology

  • Morten Kjaergaard

    Research Laboratory of Electronics, Massachusetts Institute of Technology MIT, Massachusetts Institute of Technology MIT, Research Laboratory of Electronics, Massachusetts Institute of Technology, Massachusetts Institute of Technology

  • Tim Menke

    Harvard Department of Physics, MIT Research Laboratory of Electronics, MIT Department of Physics, Harvard University, Massachusetts Institute of Technology, Massachusetts Institute of Technology MIT, Harvard University; Research Laboratory of Electronics, Massachusetts Institute of Technology, Physics, MIT

  • Roni Winik

    Research Laboratory of Electronics, Massachusetts Institute of Technology, Research Laboratory of Electronics, Massachusetts Institute of Technology MIT, Massachusetts Institute of Technology MIT, Massachusetts Institute of Technology

  • David K Kim

    MIT Lincoln Laboratory, MIT Lincoln Lab, MIT-Lincoln Lab, MIT Lincoln Laboratories, Lincoln Laboratory, Massachusetts Institute of Technology (MIT), Massachusetts Institute of Technology (MIT) Lincoln Laboratory

  • Bethany Niedzielski

    MIT Lincoln Laboratory

  • Alexander Melville

    MIT Lincoln Laboratory, MIT Lincoln Lab, MIT Lincoln Laboratories, Massachusetts Institute of Technology (MIT) Lincoln Laboratory

  • Jonilyn Yoder

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

  • Cyrus F. Hirjibehedin

    MIT Lincoln Laboratory, University College London, UK

  • Terry Philip Orlando

    Electrical Engineering and Computer Science, Research Laboratory of Electronics, Massachusetts Institute of Technology, Research Laboratory of Electronics, Massachusetts Institute of Technology MIT, Massachusetts Institute of Technology MIT, Electrical Engineering and Computer Science, Massachusetts Institute of Technology, Research Laboratory of Electronics, Massachusetts Institute of Technology, Massachusetts Institute of Technology, MIT Lincoln Laboratory, Department of Electrical Engineering and Computer Science, Massachusetts Institute of Technology (MIT)

  • Simon Gustavsson

    Research Laboratory of Electronics, Massachusetts Institute of Technology, Research Laboratory of Electronics, Massachusetts Institute of Technology MIT, Massachusetts Institute of Technology MIT, Massachusetts Institute of Technology, Research Laboratory of Electronics, Massachusetts Institute of Technology (MIT)

  • William Oliver

    Research Laboratory of Electronics, Department of Electrical Engineering and Computer Science, Department of Physics, MIT Lincoln Laboratory, Massachusetts Institute of Techn, MIT Lincoln Lab, MIT Lincoln Laboratory, MIT Lincoln Laboratory, Massachusetts Institute of Technology, Department of Physics, Department of Electrical Engineering and Computer Science, Research Laboratory of Electronics, Lincoln Laboratory, Massachusetts Institute of Technology, Research Laboratory of Electronics, Massachusetts Institute of Technology MIT, Massachusetts Institute of Technology MIT, Department of Electrical Engineering and Computer Science, Department of Physics, Massachusetts Institute of Technology; MIT Lincoln Laboratory, Department of Electrical Engineering and Computer Science, Department of Physics, MIT Lincoln Laboratory, Massachusetts Institute of Technology, Massachusetts Institute of Technology, Research Laboratory of Electronics, Massachusetts Institute of Technology, Research Laboratory of Electronics, Department of Electrical Engineering & Computer Science, Department of Physics, Massachusetts Institute of Technology and MIT Lincoln Labo, Physics, MIT, MIT-Lincoln Lab, MIT Lincoln Laboratories, Research Laboratory of Electronics, Department of Physics, Department of Electrical Engineering and Computer Science, Lincoln Laboratory, Massachusetts Institute of Technolog