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Coherent spin qubit transport in silicon

Author

Listed:
  • J. Yoneda

    (The University of New South Wales
    Tokyo Institute of Technology)

  • W. Huang

    (The University of New South Wales
    ETH Zurich)

  • M. Feng

    (The University of New South Wales)

  • C. H. Yang

    (The University of New South Wales)

  • K. W. Chan

    (The University of New South Wales)

  • T. Tanttu

    (The University of New South Wales)

  • W. Gilbert

    (The University of New South Wales)

  • R. C. C. Leon

    (The University of New South Wales)

  • F. E. Hudson

    (The University of New South Wales)

  • K. M. Itoh

    (Keio University)

  • A. Morello

    (The University of New South Wales)

  • S. D. Bartlett

    (University of Sydney)

  • A. Laucht

    (The University of New South Wales)

  • A. Saraiva

    (The University of New South Wales)

  • A. S. Dzurak

    (The University of New South Wales)

Abstract

A fault-tolerant quantum processor may be configured using stationary qubits interacting only with their nearest neighbours, but at the cost of significant overheads in physical qubits per logical qubit. Such overheads could be reduced by coherently transporting qubits across the chip, allowing connectivity beyond immediate neighbours. Here we demonstrate high-fidelity coherent transport of an electron spin qubit between quantum dots in isotopically-enriched silicon. We observe qubit precession in the inter-site tunnelling regime and assess the impact of qubit transport using Ramsey interferometry and quantum state tomography techniques. We report a polarization transfer fidelity of 99.97% and an average coherent transfer fidelity of 99.4%. Our results provide key elements for high-fidelity, on-chip quantum information distribution, as long envisaged, reinforcing the scaling prospects of silicon-based spin qubits.

Suggested Citation

  • J. Yoneda & W. Huang & M. Feng & C. H. Yang & K. W. Chan & T. Tanttu & W. Gilbert & R. C. C. Leon & F. E. Hudson & K. M. Itoh & A. Morello & S. D. Bartlett & A. Laucht & A. Saraiva & A. S. Dzurak, 2021. "Coherent spin qubit transport in silicon," Nature Communications, Nature, vol. 12(1), pages 1-9, December.
    • Handle: RePEc:nat:natcom:v:12:y:2021:i:1:d:10.1038_s41467-021-24371-7
    DOI: 10.1038/s41467-021-24371-7
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    Cited by:

    1. 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.
    2. C. G. L. Bøttcher & S. P. Harvey & S. Fallahi & G. C. Gardner & M. J. Manfra & U. Vool & S. D. Bartlett & A. Yacoby, 2022. "Parametric longitudinal coupling between a high-impedance superconducting resonator and a semiconductor quantum dot singlet-triplet spin qubit," Nature Communications, Nature, vol. 13(1), pages 1-10, 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.

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