Characterizing charge-parity detection based on an offset-charge-tunable transmon qubit via randomized benchmarking
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arXiv
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| Auteurs principaux: | , , , , , , , , , , , , , |
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| Format: | Preprint |
| Publié: |
2026
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| _version_ | 1866910099931398144 |
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| author | Jiang, Yao-Yao Su, Tang Liu, Yuxiang Guo, Yi-Ming Song, Yidong Li, Yu-Long Zeng, Yanjie Xue, Guang-Ming Sun, Wei-Jie Li, Mei-Ling Jin, Yi-Rong Wang, Junhua Li, Xuegang Yu, Hai-Feng |
| author_facet | Jiang, Yao-Yao Su, Tang Liu, Yuxiang Guo, Yi-Ming Song, Yidong Li, Yu-Long Zeng, Yanjie Xue, Guang-Ming Sun, Wei-Jie Li, Mei-Ling Jin, Yi-Rong Wang, Junhua Li, Xuegang Yu, Hai-Feng |
| contents | Superconducting qubits are compelling platforms for charge-parity detection and, due to their theoretical sensitivity on the meV energy scale, hold promise for rare event searches. In this work, we realize high-fidelity mapping of charge-parity states onto qubit states using an offset-charge-tunable transmon qubit and efficiently characterize the fidelity of the charge-parity detection via randomized benchmarking. Specifically, a gate control line is applied to control offset charge, allowing us to achieve the single-qubit gate fidelity up to 99.96%. We combine a net-zero-based pulse on the gate line with a spin-echo-based sequence to realize charge-parity mapping, achieving a fidelity of 99.37%. Then, we demonstrate continuous monitoring of the charge-parity state with over 93.4% fidelity at a 4-μs sampling interval. Finally, an error analysis of charge-parity detection is performed, and it is found that qubit readout is currently the largest source of error. We believe this work lays the foundation for future exploration of ultra-low energy particles. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2604_02809 |
| institution | arXiv |
| publishDate | 2026 |
| record_format | arxiv |
| spellingShingle | Characterizing charge-parity detection based on an offset-charge-tunable transmon qubit via randomized benchmarking Jiang, Yao-Yao Su, Tang Liu, Yuxiang Guo, Yi-Ming Song, Yidong Li, Yu-Long Zeng, Yanjie Xue, Guang-Ming Sun, Wei-Jie Li, Mei-Ling Jin, Yi-Rong Wang, Junhua Li, Xuegang Yu, Hai-Feng Quantum Physics Superconducting qubits are compelling platforms for charge-parity detection and, due to their theoretical sensitivity on the meV energy scale, hold promise for rare event searches. In this work, we realize high-fidelity mapping of charge-parity states onto qubit states using an offset-charge-tunable transmon qubit and efficiently characterize the fidelity of the charge-parity detection via randomized benchmarking. Specifically, a gate control line is applied to control offset charge, allowing us to achieve the single-qubit gate fidelity up to 99.96%. We combine a net-zero-based pulse on the gate line with a spin-echo-based sequence to realize charge-parity mapping, achieving a fidelity of 99.37%. Then, we demonstrate continuous monitoring of the charge-parity state with over 93.4% fidelity at a 4-μs sampling interval. Finally, an error analysis of charge-parity detection is performed, and it is found that qubit readout is currently the largest source of error. We believe this work lays the foundation for future exploration of ultra-low energy particles. |
| title | Characterizing charge-parity detection based on an offset-charge-tunable transmon qubit via randomized benchmarking |
| topic | Quantum Physics |
| url | https://arxiv.org/abs/2604.02809 |