High-fidelity geometric quantum gates exceeding 99.9% in germanium quantum dots
Achieving high-fidelity and robust qubit manipulations is a crucial requirement for realizing fault-tolerant quantum computation. Here, we demonstrate a single-hole spin qubit in a germanium quantum dot and characterize its control fidelity using gate set tomography. The maximum control fidelities reach 97.48%, 99.81%, 99.88% for the I, X/2 and Y/2 gate, respectively. These results reveal that off-resonance noise during consecutive I gates in gate set tomography sequences severely limits qubit performance. Therefore, we introduce geometric quantum computation to realize noise-resilient qubit manipulation. The geometric gate control fidelities remain above 99% across a wide range of Rabi frequencies. The maximum fidelity surpasses 99.9%. Furthermore, the fidelities of geometric X/2 and Y/2 (I) gates exceed 99% even when detuning the microwave frequency by ± 2.5 MHz (± 1.2 MHz), highlighting the noise-resilient feature. These results demonstrate that geometric quantum computation is a potential method for achieving high-fidelity qubit manipulation reproducibly in semiconductor quantum computation.
Authors
- Gang Cao (ORCID: https://orcid.org/0000-0002-3599-5496)
- Chengxian Zhang (ORCID: https://orcid.org/0000-0003-4262-6055)
- Zhenzhen Kong (ORCID: https://orcid.org/0000-0001-8563-5424)
- Zhitao Wu (ORCID: https://orcid.org/0000-0003-2122-7063)
- Hai-Ou Li (ORCID: https://orcid.org/0000-0002-9898-4735)
- Rong-Long Ma
- Guilei Wang (ORCID: https://orcid.org/0000-0002-1311-8863)
- Guo‐Ping Guo (ORCID: https://orcid.org/0000-0002-2179-9507)
- Xin Zhang (ORCID: https://orcid.org/0000-0003-3780-4769)
- Hao-Tian Jiang
- Yuchen Zhou (ORCID: https://orcid.org/0000-0002-9482-5489)
- Guang‐Can Guo
- Ao-Ran Li
- Yang Liu (ORCID: https://orcid.org/0000-0003-4742-4911)
Institutions
- University of Science and Technology of China (CN)
- Guangxi University (CN)
- Hefei University of Technology (CN)
- Chinese Academy of Sciences (CN)
- Beijing Film Academy (CN)
- Hefei University (CN)
- Hefei National Center for Physical Sciences at Nanoscale (CN)
- Institute of Microelectronics (CN)
- Quantum Design (Germany) (DE)
- QuantumCTek (China) (CN)
- QuTech (NL)
- Origin Quantum Computing Technology Company (China) (CN)
- Delft University of Technology (NL)
Publication Details
- Journal
- Nature Communications
- Published
- 2025-08-26
- DOI
- https://doi.org/10.1038/s41467-025-63241-4
- Citations
- 4
- Primary Topic
- Quantum and electron transport phenomena
- Type
- article
- Field-Weighted Citation Impact
- 4.99
Funders
- National Natural Science Foundation of China
- University of Science and Technology of China