Simultaneous high-fidelity single-qubit gates in a spin qubit array
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.
Authors
- Hsi‐Sheng Goan (ORCID: https://orcid.org/0000-0001-8117-5846)
- Seigo Tarucha (ORCID: https://orcid.org/0000-0001-7465-0135)
- Kenta Takeda (ORCID: https://orcid.org/0000-0003-1240-1103)
- Yi-Hsien Wu (ORCID: https://orcid.org/0009-0002-4137-989X)
- Giordano Scappucci (ORCID: https://orcid.org/0000-0003-2512-0079)
- Ik Kyeong Jin (ORCID: https://orcid.org/0000-0002-8758-4197)
- Akito Noiri (ORCID: https://orcid.org/0000-0001-9145-0303)
- Takashi Nakajima (ORCID: https://orcid.org/0000-0001-6759-6441)
- Leon C. Camenzind (ORCID: https://orcid.org/0000-0002-2278-1915)
Institutions
- National Taiwan University of Science and Technology (TW)
- National Taiwan University (TW)
- ETH Zurich (CH)
- RIKEN (JP)
- National Center for Theoretical Sciences (TW)
- RIKEN Center for Emergent Matter Science (JP)
- QuTech (NL)
- National Center for Theoretical Sciences, Physics Division
- Laboratory for Solid State Physics (CH)
- Delft University of Technology (NL)
Publication Details
- Journal
- Nature Physics
- Published
- 2026-10-15
- DOI
- https://doi.org/10.1038/s41567-026-03466-2
- Citations
- 3
- Primary Topic
- Quantum and electron transport phenomena
- Type
- article
- Field-Weighted Citation Impact
- 8.11
Funders
- National Center for Theoretical Sciences
- Ministry of Education, Culture, Sports, Science and Technology
- Schweizerischer Nationalfonds zur Förderung der Wissenschaftlichen Forschung
- Ministry of Education, India
- National Taiwan University
- Thailand Science Research and Innovation
- National Science and Technology Council
- U.S. Air Force
- Physics Division, National Center for Theoretical Sciences
- Japan Society for the Promotion of Science
- Japan Science and Technology Agency
- RIKEN
- Core Research for Evolutional Science and Technology
- Precursory Research for Embryonic Science and Technology
- Moonshot Research and Development Program
- Air Force Office of Scientific Research