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Breaking the trade-off between fast control and long lifetime of a superconducting qubit

Author

Listed:
  • S. Kono

    (RIKEN)

  • K. Koshino

    (Tokyo Medical and Dental University)

  • D. Lachance-Quirion

    (The University of Tokyo
    Université de Sherbrooke)

  • A. F. van Loo

    (RIKEN)

  • Y. Tabuchi

    (The University of Tokyo)

  • A. Noguchi

    (The University of Tokyo
    Japan Science and Technology Agency)

  • Y. Nakamura

    (RIKEN
    The University of Tokyo)

Abstract

The rapid development in designs and fabrication techniques of superconducting qubits has made coherence times of qubits longer. In the future, however, the radiative decay of a qubit into its control line will be a fundamental limitation, imposing a trade-off between fast control and long lifetime of the qubit. Here, we break this trade-off by strongly coupling another superconducting qubit along the control line. This second qubit, which we call “Josephson quantum filter” (JQF), prevents the first qubit from emitting microwave photons and thus suppresses its relaxation, while transmitting large-amplitude control microwave pulses due to the saturation of the quantum filter, enabling fast qubit control. This device functions as an automatic decoupler between a qubit and its control line and could help in the realization of a large-scale superconducting quantum processor by reducing the heating of the qubit environment and the crosstalk between qubits.

Suggested Citation

  • S. Kono & K. Koshino & D. Lachance-Quirion & A. F. van Loo & Y. Tabuchi & A. Noguchi & Y. Nakamura, 2020. "Breaking the trade-off between fast control and long lifetime of a superconducting qubit," Nature Communications, Nature, vol. 11(1), pages 1-6, December.
    • Handle: RePEc:nat:natcom:v:11:y:2020:i:1:d:10.1038_s41467-020-17511-y
    DOI: 10.1038/s41467-020-17511-y
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    Cited by:

    1. Xiaoxuan Pan & Zhide Lu & Weiting Wang & Ziyue Hua & Yifang Xu & Weikang Li & Weizhou Cai & Xuegang Li & Haiyan Wang & Yi-Pu Song & Chang-Ling Zou & Dong-Ling Deng & Luyan Sun, 2023. "Deep quantum neural networks on a superconducting processor," Nature Communications, Nature, vol. 14(1), pages 1-7, December.
    2. Shingo Kono & Jiahe Pan & Mahdi Chegnizadeh & Xuxin Wang & Amir Youssefi & Marco Scigliuzzo & Tobias J. Kippenberg, 2024. "Mechanically induced correlated errors on superconducting qubits with relaxation times exceeding 0.4 ms," Nature Communications, Nature, vol. 15(1), pages 1-12, December.

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