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A shuttling-based two-qubit logic gate for linking distant silicon quantum processors

Author

Listed:
  • Akito Noiri

    (RIKEN Center for Emergent Matter Science (CEMS))

  • Kenta Takeda

    (RIKEN Center for Emergent Matter Science (CEMS))

  • Takashi Nakajima

    (RIKEN Center for Emergent Matter Science (CEMS))

  • Takashi Kobayashi

    (RIKEN Center for Quantum Computing (RQC))

  • Amir Sammak

    (QuTech, Delft University of Technology
    Netherlands Organization for Applied Scientific Research (TNO))

  • Giordano Scappucci

    (QuTech, Delft University of Technology
    Delft University of Technology)

  • Seigo Tarucha

    (RIKEN Center for Emergent Matter Science (CEMS)
    RIKEN Center for Quantum Computing (RQC))

Abstract

Control of entanglement between qubits at distant quantum processors using a two-qubit gate is an essential function of a scalable, modular implementation of quantum computation. Among the many qubit platforms, spin qubits in silicon quantum dots are promising for large-scale integration along with their nanofabrication capability. However, linking distant silicon quantum processors is challenging as two-qubit gates in spin qubits typically utilize short-range exchange coupling, which is only effective between nearest-neighbor quantum dots. Here we demonstrate a two-qubit gate between spin qubits via coherent spin shuttling, a key technology for linking distant silicon quantum processors. Coherent shuttling of a spin qubit enables efficient switching of the exchange coupling with an on/off ratio exceeding 1000, while preserving the spin coherence by 99.6% for the single shuttling between neighboring dots. With this shuttling-mode exchange control, we demonstrate a two-qubit controlled-phase gate with a fidelity of 93%, assessed via randomized benchmarking. Combination of our technique and a phase coherent shuttling of a qubit across a large quantum dot array will provide feasible path toward a quantum link between distant silicon quantum processors, a key requirement for large-scale quantum computation.

Suggested Citation

  • Akito Noiri & Kenta Takeda & Takashi Nakajima & Takashi Kobayashi & Amir Sammak & Giordano Scappucci & Seigo Tarucha, 2022. "A shuttling-based two-qubit logic gate for linking distant silicon quantum processors," Nature Communications, Nature, vol. 13(1), pages 1-7, December.
  • Handle: RePEc:nat:natcom:v:13:y:2022:i:1:d:10.1038_s41467-022-33453-z
    DOI: 10.1038/s41467-022-33453-z
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    References listed on IDEAS

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    Cited by:

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    2. Floor Riggelen-Doelman & Chien-An Wang & Sander L. Snoo & William I. L. Lawrie & Nico W. Hendrickx & Maximilian Rimbach-Russ & Amir Sammak & Giordano Scappucci & Corentin Déprez & Menno Veldhorst, 2024. "Coherent spin qubit shuttling through germanium quantum dots," Nature Communications, Nature, vol. 15(1), pages 1-9, December.
    3. Brian Paquelet Wuetz & Davide Degli Esposti & Anne-Marije J. Zwerver & Sergey V. Amitonov & Marc Botifoll & Jordi Arbiol & Amir Sammak & Lieven M. K. Vandersypen & Maximilian Russ & Giordano Scappucci, 2023. "Reducing charge noise in quantum dots by using thin silicon quantum wells," Nature Communications, Nature, vol. 14(1), pages 1-9, December.
    4. Wei, Dongmei & Liu, Hailing & Li, Yongmei & Wan, Linchun & Qin, Sujuan & Wen, Qiaoyan & Gao, Fei, 2024. "Non-Markovian dynamics of time-fractional open quantum systems," Chaos, Solitons & Fractals, Elsevier, vol. 182(C).

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