Demonstration of high-fidelity gates in a strongly anharmonic with long-coherence C-shunt flux qubit
We demonstrate high-fidelity single-qubit gates on a C-shunt flux qubit that simultaneously combines a large anharmonicity (A/2π=848 MHz) with long relaxation time (T1=23 μs). The large anharmonicity significantly suppresses leakage to higher energy levels, enabling fast and precise microwave control. Using derivative removal by adiabatic gate pulses and randomized benchmarking, the qubit achieves gate fidelities exceeding 99.9%, highlighting the capability of C-shunt flux qubits for robust and high-performance quantum operations. These results establish them as a promising platform for scalable quantum information processing.
Authors
- Xinhui Ruan (ORCID: https://orcid.org/0009-0003-5380-3587)
- Di Zheng
- Y Shi
- Guihan Liang
- Silu Zhao
- Jinming Guo
- Shi Xiao
- Weiping Yuan
- Jiacheng Song
- Jinzhe Wang
- Xiaohui Song (ORCID: https://orcid.org/0009-0000-5521-9761)
- Kai Xu
- Bingjie Chen (ORCID: https://orcid.org/0009-0006-5699-9724)
- Zhongcheng Xiang (ORCID: https://orcid.org/0000-0002-0734-1217)
Institutions
- Chinese Academy of Sciences (CN)
- Hefei University (CN)
- Physical Sciences (United States) (US)
- FZU ‒ Institute of Physics of the Academy of Sciences of the Czech Republic (CZ)
- Beijing Academy of Quantum Information Sciences (CN)
- University of Chinese Academy of Sciences (CN)
Publication Details
- Journal
- Applied Physics Letters
- Published
- 2026-04-13
- DOI
- https://doi.org/10.1063/5.0311512
- Primary Topic
- Quantum Information and Cryptography
- Type
- article
- Field-Weighted Citation Impact
- 0.00
Funders
- National Natural Science Foundation of China