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Peer-reviewedCC BYNature Physics

Simultaneous high-fidelity single-qubit gates in a spin qubit array

  • Yi-Hsien Wu1,2
  • Leon C. Camenzind1
  • Patrick Bütler1,3
  • Ik Kyeong Jin1
  • Akito Noiri1
  • Kenta Takeda1
  • Takashi Nakajima1
  • Takashi Kobayashi4
  • Giordano Scappucci5
  • Hsi‐Sheng Goan6,2,7
  • Seigo Tarucha1,4
7 affiliations
  1. 1Center for Emergent Matter Science, RIKEN, Wako-shi, Japan
  2. 2Department of Physics, National Taiwan University, Taipei, Taiwan
  3. 3Laboratory for Solid State Physics, ETH Zurich, Zurich, Switzerland
  4. 4Center for Quantum Computing, RIKEN, Wako-shi, Japan
  5. 5QuTech and Kavli Institute of Nanoscience, Delft University of Technology, Delft, the Netherlands
  6. 6Center of Quantum Science and Engineering, National Taiwan University, Taipei, Taiwan
  7. 7Physics Division, National Center for Theoretical Sciences, Taipei, Taiwan
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Abstract

Silicon spin qubits offer a promising path to scalable quantum computing due to their compatibility with industrial semiconductor manufacturing. A key requirement for scaling quantum processors is the ability to perform high-fidelity operations in parallel across many qubits. However, simultaneous control remains a major challenge in silicon devices, as fidelities typically degrade under parallel operation. Here we identify microwave-drive-induced a.c.-Stark shifts as the dominant source of this degradation in a five-qubit silicon spin array. We address this by introducing a scalable mitigation protocol based solely on pairwise phase calibrations. Using tailored control pulses on a shared control line, we achieve primitive X and Y gate fidelities well above 99.99% for each qubit individually, with some approaching 99.999%. Furthermore, these fidelities are preserved above 99.99% during simultaneous operation of up to three qubits. During parallel five-qubit operation, fidelities remain above the widely targeted fault-tolerant threshold of 99.9%. By maintaining high-fidelity control during simultaneous operation, shared qubit-control lines can support the development of large-scale semiconductor quantum processors.

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Cite

BibTeXRIS
BibTeX
@article{wu2026simultaneous,
  title = {{Simultaneous high-fidelity single-qubit gates in a spin qubit array}},
  author = {Yi-Hsien Wu and Leon C. Camenzind and Patrick Bütler and Ik Kyeong Jin and Akito Noiri and Kenta Takeda and Takashi Nakajima and Takashi Kobayashi and Giordano Scappucci and Hsi‐Sheng Goan and Seigo Tarucha},
  journal = {Nature Physics},
  year = {2026},
  month = oct,
  doi = {10.1038/s41567-026-03466-2},
  url = {https://doi.org/10.1038/s41567-026-03466-2},
  note = {CC BY},
}
RIS
TY  - JOUR
TI  - Simultaneous high-fidelity single-qubit gates in a spin qubit array
AU  - Yi-Hsien Wu
AU  - Leon C. Camenzind
AU  - Patrick Bütler
AU  - Ik Kyeong Jin
AU  - Akito Noiri
AU  - Kenta Takeda
AU  - Takashi Nakajima
AU  - Takashi Kobayashi
AU  - Giordano Scappucci
AU  - Hsi‐Sheng Goan
AU  - Seigo Tarucha
PY  - 2026
DA  - 2026/10/15
JO  - Nature Physics
DO  - 10.1038/s41567-026-03466-2
UR  - https://doi.org/10.1038/s41567-026-03466-2
AB  - Silicon spin qubits offer a promising path to scalable quantum computing due to their compatibility with industrial semiconductor manufacturing. A key requirement for scaling quantum processors is the ability to perform high-fidelity operations in parallel across many qubits. However, simultaneous control remains a major challenge in silicon devices, as fidelities typically degrade under parallel operation. Here we identify microwave-drive-induced a.c.-Stark shifts as the dominant source of this degradation in a five-qubit silicon spin array. We address this by introducing a scalable mitigation protocol based solely on pairwise phase calibrations. Using tailored control pulses on a shared control line, we achieve primitive X and Y gate fidelities well above 99.99% for each qubit individually, with some approaching 99.999%. Furthermore, these fidelities are preserved above 99.99% during simultaneous operation of up to three qubits. During parallel five-qubit operation, fidelities remain above the widely targeted fault-tolerant threshold of 99.9%. By maintaining high-fidelity control during simultaneous operation, shared qubit-control lines can support the development of large-scale semiconductor quantum processors.
SN  - 1745-2473
SN  - 1745-2481
ER  -