Underground Measurement of Correlated Charge Noise in Superconducting Qubits

ORAL

Abstract

Particle interactions in a superconducting qubit chip can cause phonon excitation and trapped charges. The phonons can be absorbed by the superconductor and generate non-equilibrium quasiparticles that can tunnel across the Josephson junction and interact with the qubit energy. Trapped charges change the electric field environment over long timescales and cause charge noise in charge-sensitive qubits. Large energy deposits, such as those from ionizing radiation, can cause such behavior across multiple qubits on the same chip, correlated in space and time. We present results from recent measurements of an array of weakly charge-sensitive superconducting qubits exposed to a range of radiation fluxes in an underground, low-background environment. We discuss the relationship between gamma flux and qubit charge noise.

*This manuscript has been authored by Fermi Research Alliance, LLC under Contract No. DE-AC02-07CH11359 with the U.S. Department of Energy, Office of Science, Office of High Energy Physics. This work was supported by the U.S. Department of Energy, Office of Science, National Quantum Information Science Research Centers, Quantum Science Center, and the U.S. Department of Energy, Office of Science, High-Energy Physics Program Office. This work was supported in part by the U.S. Department of Energy, Office of Science, Office of Workforce Development for Teachers and Scientists (WDTS) under the Science Undergraduate Laboratory Internships Program (SULI). This material is based upon work supported by the National Science Foundation Graduate Research Fellowship Program under Grant No. DGE-2234667. Any opinions, findings, and conclusions or recommendations expressed in this material are those of the authors and do not necessarily reflect the views of the National Science Foundation.

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Publication: G. Bratrud, et al, "First measurement of correlated charge noise in superconducting qubits at an underground facility," arXiv preprint https://arxiv.org/pdf/2405.04642, 2024

Presenters

  • Grace Bratrud

    • Northwestern University

Authors

  • Grace Bratrud

    • Northwestern University

  • Daniel Bowring

    • Fermilab
    • Fermi National Accelerator Laboratory (Fermilab)

  • Daniel S Baxter

    • Fermi National Accelerator Laboratory (Fermilab)

  • Enectali Figueroa-Feliciano

    • Northwestern University