Investigations of 1/f Magnetic Flux Noise in Superconducting Qubits with Weak Magnetic Fields

ORAL

Abstract

Low-frequency 1/f magnetic flux noise is known to limit the coherence of superconducting qubits, yet an understanding of its microscopic origins is still lacking. Although magnetically coupled surface defects, so-called “surface spins,” are widely accepted to be the source, their identities and interaction mechanisms remain an open question. We showed in recent experiments on aluminum C-shunt flux qubits [1] that the noise power spectrum responds anomalously to the application of weak in-plane magnetic fields. We report on the continuation of these studies, particularly focusing on advanced noise spectroscopy techniques and field-orientation dependence.

[1] D. A. Rower et al., Phys. Rev. Lett. 130, 220602 (2023).

* This material is based upon work supported in part by the U.S. Department of Energy, Office of Science, National Quantum Information Science Research Centers, Co-design Center for Quantum Advantage (C2QA) under contract number DE-SC0012704, and in part by the Under Secretary of Defense for Research and Engineering under Air Force Contract No. FA8702-15-D-0001. L.A. and D.A.R. acknowledge support by NSF Graduate Research Fellowships. The views and conclusions contained herein are those of the authors and should not be interpreted as necessarily representing the official policies or endorsements, either expressed or implied, of the U.S. Government.

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Presenters

  • Lamia Ateshian

    Massachusetts Institute of Technology (MIT)

Authors

  • Lamia Ateshian

    Massachusetts Institute of Technology (MIT)

  • David A Rower

    MIT, MIT, Oliver Group (EQuS)

  • Max Hays

    MIT, Massachusetts Institute of Technology (MIT), Massachusetts Institute of Technology MI, Massachusetts Institute of Technology, Massachussets Institute of Technology, Massachusetts Institute of Technology MIT

  • Lauren H Li

    Massachusetts Institute of Technology

  • Leon Ding

    Massachusetts Institute of Technology MI, Massachusetts Institute of Technology

  • David K Kim

    MIT Lincoln Lab, MIT Lincoln Laboratory

  • Bethany M Niedzielski

    MIT Lincoln Lab, MIT Lincoln Laboratory

  • Jonilyn L Yoder

    MIT Lincoln Lab, MIT Lincoln Laboratory

  • Mollie E Schwartz

    MIT Lincoln Laboratory

  • Terry P Orlando

    Massachusetts Institute of Technology MIT, Massachusetts Institute of Technology

  • Joel I Wang

    Massachusetts Institute of Technology MI, Massachusetts Institute of Technology

  • Simon Gustavsson

    Massachusetts Institute of Technology MIT, Massachusetts Institute of Technology

  • Jeffrey A Grover

    Massachusetts Institute of Technology, Massachusetts Institute of Technology (MIT), Massachusetts Institute of Technology MIT

  • Kyle Serniak

    MIT Lincoln Laboratory & MIT RLE, MIT Lincoln Laboratory, MIT Lincoln Laboratory, MIT RLE

  • Riccardo Comin

    Massachusetts Institute of Technology, MIT

  • William D Oliver

    Massachusetts Institute of Technology MI, Massachusetts Institute of Technology, Massachusetts Institute of Technology (MIT), Massachusetts Institute of Technology MIT