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Multi-level quantum noise spectroscopy

Author

Listed:
  • Youngkyu Sung

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

  • Antti Vepsäläinen

    (Research Laboratory of Electronics, Massachusetts Institute of Technology)

  • Jochen Braumüller

    (Research Laboratory of Electronics, Massachusetts Institute of Technology)

  • Fei Yan

    (Research Laboratory of Electronics, Massachusetts Institute of Technology
    Southern University of Science and Technology)

  • Joel I-Jan Wang

    (Research Laboratory of Electronics, Massachusetts Institute of Technology)

  • Morten Kjaergaard

    (Research Laboratory of Electronics, Massachusetts Institute of Technology
    University of Copenhagen)

  • Roni Winik

    (Research Laboratory of Electronics, Massachusetts Institute of Technology)

  • Philip Krantz

    (Research Laboratory of Electronics, Massachusetts Institute of Technology)

  • Andreas Bengtsson

    (Research Laboratory of Electronics, Massachusetts Institute of Technology)

  • Alexander J. Melville

    (MIT Lincoln Laboratory)

  • Bethany M. Niedzielski

    (MIT Lincoln Laboratory)

  • Mollie E. Schwartz

    (MIT Lincoln Laboratory)

  • David K. Kim

    (MIT Lincoln Laboratory)

  • Jonilyn L. Yoder

    (MIT Lincoln Laboratory)

  • Terry P. Orlando

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

  • Simon Gustavsson

    (Research Laboratory of Electronics, Massachusetts Institute of Technology)

  • William D. Oliver

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

Abstract

System noise identification is crucial to the engineering of robust quantum systems. Although existing quantum noise spectroscopy (QNS) protocols measure an aggregate amount of noise affecting a quantum system, they generally cannot distinguish between the underlying processes that contribute to it. Here, we propose and experimentally validate a spin-locking-based QNS protocol that exploits the multi-level energy structure of a superconducting qubit to achieve two notable advances. First, our protocol extends the spectral range of weakly anharmonic qubit spectrometers beyond the present limitations set by their lack of strong anharmonicity. Second, the additional information gained from probing the higher-excited levels enables us to identify and distinguish contributions from different underlying noise mechanisms.

Suggested Citation

  • Youngkyu Sung & Antti Vepsäläinen & Jochen Braumüller & Fei Yan & Joel I-Jan Wang & Morten Kjaergaard & Roni Winik & Philip Krantz & Andreas Bengtsson & Alexander J. Melville & Bethany M. Niedzielski , 2021. "Multi-level quantum noise spectroscopy," Nature Communications, Nature, vol. 12(1), pages 1-9, December.
    • Handle: RePEc:nat:natcom:v:12:y:2021:i:1:d:10.1038_s41467-021-21098-3
    DOI: 10.1038/s41467-021-21098-3
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    Cited by:

    1. Yu-Xin Wang & Aashish A. Clerk, 2021. "Intrinsic and induced quantum quenches for enhancing qubit-based quantum noise spectroscopy," Nature Communications, Nature, vol. 12(1), pages 1-14, December.

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