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Quantized current steps due to the synchronization of microwaves with Bloch oscillations in small Josephson junctions

Author

Listed:
  • Rais S. Shaikhaidarov

    (Royal Holloway University of London
    National Physical Laboratory)

  • Kyung Ho Kim

    (Royal Holloway University of London)

  • Jacob Dunstan

    (Royal Holloway University of London)

  • Ilya Antonov

    (Royal Holloway University of London
    National Physical Laboratory)

  • Dmitry Golubev

    (HQS Quantum Simulations GmbH
    QTF Centre of Excellence)

  • Vladimir N. Antonov

    (Royal Holloway University of London)

  • Oleg V. Astafiev

    (Royal Holloway University of London
    Skolkovo Institute of Science and Technology)

Abstract

Synchronization of Bloch oscillations in small Josephson junctions (JJs) under microwave radiation, which leads to current quantization, has been proposed as an effect that is dual to the appearance of Shapiro steps. This current quantization was recently demonstrated in superconducting nanowires in a compact high-impedance environment. Direct observation of current quantization in JJs would confirm the synchronization of Bloch oscillations with microwaves and help with the realisation of the metrological current standard. Here, we place JJs in a high-impedance environment and demonstrate dual Shapiro steps for frequencies up to 24 GHz (I = 7.7 nA). Current quantization exists, however, only in a narrow range of JJ parameters. We carry out a systematic study to explain this by invoking the model of a JJ in the presence of thermal noise. The findings are important for fundamental physics and application in quantum metrology.

Suggested Citation

  • Rais S. Shaikhaidarov & Kyung Ho Kim & Jacob Dunstan & Ilya Antonov & Dmitry Golubev & Vladimir N. Antonov & Oleg V. Astafiev, 2024. "Quantized current steps due to the synchronization of microwaves with Bloch oscillations in small Josephson junctions," Nature Communications, Nature, vol. 15(1), pages 1-6, December.
    • Handle: RePEc:nat:natcom:v:15:y:2024:i:1:d:10.1038_s41467-024-53600-y
    DOI: 10.1038/s41467-024-53600-y
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    as
    1. Rais S. Shaikhaidarov & Kyung Ho Kim & Jacob W. Dunstan & Ilya V. Antonov & Sven Linzen & Mario Ziegler & Dmitry S. Golubev & Vladimir N. Antonov & Evgeni V. Il’ichev & Oleg V. Astafiev, 2022. "Quantized current steps due to the a.c. coherent quantum phase-slip effect," Nature, Nature, vol. 608(7921), pages 45-49, August.
    2. Fabian Kaap & Christoph Kissling & Victor Gaydamachenko & Lukas Grünhaupt & Sergey Lotkhov, 2024. "Demonstration of dual Shapiro steps in small Josephson junctions," Nature Communications, Nature, vol. 15(1), pages 1-6, December.
    3. M. Lucas & A. V. Danilov & L. V. Levitin & A. Jayaraman & A. J. Casey & L. Faoro & A. Ya. Tzalenchuk & S. E. Kubatkin & J. Saunders & S. E. de Graaf, 2023. "Quantum bath suppression in a superconducting circuit by immersion cooling," Nature Communications, Nature, vol. 14(1), pages 1-8, December.
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    1. Fabian Kaap & Christoph Kissling & Victor Gaydamachenko & Lukas Grünhaupt & Sergey Lotkhov, 2024. "Demonstration of dual Shapiro steps in small Josephson junctions," Nature Communications, Nature, vol. 15(1), pages 1-6, December.

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