Error per single-qubit gate below 10−4 in a superconducting qubit
Abstract Implementing arbitrary single-qubit gates with near perfect fidelity is among the most fundamental requirements in gate-based quantum information processing. In this work, we fabricate a transmon qubit with long coherence times and demonstrate single-qubit gates with the average gate error...
| Main Authors: | , , , , , , , , , , , , |
|---|---|
| Format: | Article |
| Language: | English |
| Published: |
Nature Portfolio
2023-11-01
|
| Series: | npj Quantum Information |
| Online Access: | https://doi.org/10.1038/s41534-023-00781-x |
| _version_ | 1797636790394290176 |
|---|---|
| author | Zhiyuan Li Pei Liu Peng Zhao Zhenyu Mi Huikai Xu Xuehui Liang Tang Su Weijie Sun Guangming Xue Jing-Ning Zhang Weiyang Liu Yirong Jin Haifeng Yu |
| author_facet | Zhiyuan Li Pei Liu Peng Zhao Zhenyu Mi Huikai Xu Xuehui Liang Tang Su Weijie Sun Guangming Xue Jing-Ning Zhang Weiyang Liu Yirong Jin Haifeng Yu |
| author_sort | Zhiyuan Li |
| collection | DOAJ |
| description | Abstract Implementing arbitrary single-qubit gates with near perfect fidelity is among the most fundamental requirements in gate-based quantum information processing. In this work, we fabricate a transmon qubit with long coherence times and demonstrate single-qubit gates with the average gate error below 10−4, i.e. (7.42 ± 0.04) × 10−5 by randomized benchmarking (RB). To understand the error sources, we experimentally obtain an error budget, consisting of the decoherence errors lower bounded by (4.62 ± 0.04) × 10−5 and the leakage rate per gate of (1.16 ± 0.04) × 10−5. Moreover, we reconstruct the process matrices for the single-qubit gates by the gate set tomography (GST), with which we simulate RB sequences and obtain single-qubit fidelities consistent with experimental results. We also observe non-Markovian behavior in the experiment of long-sequence GST, which may provide guidance for further calibration. The demonstration extends the upper limit that the average fidelity of single-qubit gates can reach in a transmon-qubit system, and thus can be an essential step towards practical and reliable quantum computation in the near future. |
| first_indexed | 2024-03-11T12:39:11Z |
| format | Article |
| id | doaj.art-f3ed79e84dae4ce69bfccad31e846efc |
| institution | Directory Open Access Journal |
| issn | 2056-6387 |
| language | English |
| last_indexed | 2024-03-11T12:39:11Z |
| publishDate | 2023-11-01 |
| publisher | Nature Portfolio |
| record_format | Article |
| series | npj Quantum Information |
| spelling | doaj.art-f3ed79e84dae4ce69bfccad31e846efc2023-11-05T12:25:51ZengNature Portfolionpj Quantum Information2056-63872023-11-01911610.1038/s41534-023-00781-xError per single-qubit gate below 10−4 in a superconducting qubitZhiyuan Li0Pei Liu1Peng Zhao2Zhenyu Mi3Huikai Xu4Xuehui Liang5Tang Su6Weijie Sun7Guangming Xue8Jing-Ning Zhang9Weiyang Liu10Yirong Jin11Haifeng Yu12Beijing Academy of Quantum Information SciencesState Key Laboratory of Low Dimensional Quantum Physics, Department of Physics, Tsinghua UniversityBeijing Academy of Quantum Information SciencesBeijing Academy of Quantum Information SciencesBeijing Academy of Quantum Information SciencesBeijing Academy of Quantum Information SciencesBeijing Academy of Quantum Information SciencesBeijing Academy of Quantum Information SciencesBeijing Academy of Quantum Information SciencesBeijing Academy of Quantum Information SciencesBeijing Academy of Quantum Information SciencesBeijing Academy of Quantum Information SciencesBeijing Academy of Quantum Information SciencesAbstract Implementing arbitrary single-qubit gates with near perfect fidelity is among the most fundamental requirements in gate-based quantum information processing. In this work, we fabricate a transmon qubit with long coherence times and demonstrate single-qubit gates with the average gate error below 10−4, i.e. (7.42 ± 0.04) × 10−5 by randomized benchmarking (RB). To understand the error sources, we experimentally obtain an error budget, consisting of the decoherence errors lower bounded by (4.62 ± 0.04) × 10−5 and the leakage rate per gate of (1.16 ± 0.04) × 10−5. Moreover, we reconstruct the process matrices for the single-qubit gates by the gate set tomography (GST), with which we simulate RB sequences and obtain single-qubit fidelities consistent with experimental results. We also observe non-Markovian behavior in the experiment of long-sequence GST, which may provide guidance for further calibration. The demonstration extends the upper limit that the average fidelity of single-qubit gates can reach in a transmon-qubit system, and thus can be an essential step towards practical and reliable quantum computation in the near future.https://doi.org/10.1038/s41534-023-00781-x |
| spellingShingle | Zhiyuan Li Pei Liu Peng Zhao Zhenyu Mi Huikai Xu Xuehui Liang Tang Su Weijie Sun Guangming Xue Jing-Ning Zhang Weiyang Liu Yirong Jin Haifeng Yu Error per single-qubit gate below 10−4 in a superconducting qubit npj Quantum Information |
| title | Error per single-qubit gate below 10−4 in a superconducting qubit |
| title_full | Error per single-qubit gate below 10−4 in a superconducting qubit |
| title_fullStr | Error per single-qubit gate below 10−4 in a superconducting qubit |
| title_full_unstemmed | Error per single-qubit gate below 10−4 in a superconducting qubit |
| title_short | Error per single-qubit gate below 10−4 in a superconducting qubit |
| title_sort | error per single qubit gate below 10 4 in a superconducting qubit |
| url | https://doi.org/10.1038/s41534-023-00781-x |
| work_keys_str_mv | AT zhiyuanli errorpersinglequbitgatebelow104inasuperconductingqubit AT peiliu errorpersinglequbitgatebelow104inasuperconductingqubit AT pengzhao errorpersinglequbitgatebelow104inasuperconductingqubit AT zhenyumi errorpersinglequbitgatebelow104inasuperconductingqubit AT huikaixu errorpersinglequbitgatebelow104inasuperconductingqubit AT xuehuiliang errorpersinglequbitgatebelow104inasuperconductingqubit AT tangsu errorpersinglequbitgatebelow104inasuperconductingqubit AT weijiesun errorpersinglequbitgatebelow104inasuperconductingqubit AT guangmingxue errorpersinglequbitgatebelow104inasuperconductingqubit AT jingningzhang errorpersinglequbitgatebelow104inasuperconductingqubit AT weiyangliu errorpersinglequbitgatebelow104inasuperconductingqubit AT yirongjin errorpersinglequbitgatebelow104inasuperconductingqubit AT haifengyu errorpersinglequbitgatebelow104inasuperconductingqubit |