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Microwave quantum diode

Author

Listed:
  • Rishabh Upadhyay

    (Aalto University School of Science)

  • Dmitry S. Golubev

    (Aalto University School of Science)

  • Yu-Cheng Chang

    (Aalto University School of Science)

  • George Thomas

    (Aalto University School of Science
    VTT Technical Research Centre of Finland Ltd)

  • Andrew Guthrie

    (Aalto University School of Science)

  • Joonas T. Peltonen

    (Aalto University School of Science)

  • Jukka P. Pekola

    (Aalto University School of Science)

Abstract

The fragile nature of quantum circuits is a major bottleneck to scalable quantum applications. Operating at cryogenic temperatures, quantum circuits are highly vulnerable to amplifier backaction and external noise. Non-reciprocal microwave devices such as circulators and isolators are used for this purpose. These devices have a considerable footprint in cryostats, limiting the scalability of quantum circuits. As a proof-of-concept, here we report a compact microwave diode architecture, which exploits the non-linearity of a superconducting flux qubit. At the qubit degeneracy point we experimentally demonstrate a significant difference between the power levels transmitted in opposite directions. The observations align with the proposed theoretical model. At − 99 dBm input power, and near the qubit-resonator avoided crossing region, we report the transmission rectification ratio exceeding 90% for a 50 MHz wide frequency range from 6.81 GHz to 6.86 GHz, and over 60% for the 250 MHz range from 6.67 GHz to 6.91 GHz. The presented architecture is compact, and easily scalable towards multiple readout channels, potentially opening up diverse opportunities in quantum information, microwave read-out and optomechanics.

Suggested Citation

  • Rishabh Upadhyay & Dmitry S. Golubev & Yu-Cheng Chang & George Thomas & Andrew Guthrie & Joonas T. Peltonen & Jukka P. Pekola, 2024. "Microwave quantum diode," Nature Communications, Nature, vol. 15(1), pages 1-9, December.
    • Handle: RePEc:nat:natcom:v:15:y:2024:i:1:d:10.1038_s41467-024-44908-w
    DOI: 10.1038/s41467-024-44908-w
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    References listed on IDEAS

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    1. S. Barzanjeh & M. Wulf & M. Peruzzo & M. Kalaee & P. B. Dieterle & O. Painter & J. M. Fink, 2017. "Mechanical on-chip microwave circulator," Nature Communications, Nature, vol. 8(1), pages 1-7, December.
    2. John Clarke & Frank K. Wilhelm, 2008. "Superconducting quantum bits," Nature, Nature, vol. 453(7198), pages 1031-1042, June.
    3. Francesco Giazotto & María José Martínez-Pérez, 2012. "The Josephson heat interferometer," Nature, Nature, vol. 492(7429), pages 401-405, December.
    4. B. E. Kane, 1998. "A silicon-based nuclear spin quantum computer," Nature, Nature, vol. 393(6681), pages 133-137, May.
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