We found a match
Your institution may have access to this item. Find your institution then sign in to continue.
- Title
Error per single-qubit gate below 10<sup>−4</sup> in a superconducting qubit.
- Authors
Li, Zhiyuan; Liu, Pei; Zhao, Peng; Mi, Zhenyu; Xu, Huikai; Liang, Xuehui; Su, Tang; Sun, Weijie; Xue, Guangming; Zhang, Jing-Ning; Liu, Weiyang; Jin, Yirong; Yu, Haifeng
- 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.
- Subjects
QUBITS; QUANTUM computing; QUANTUM information science
- Publication
NPJ Quantum Information, 2023, Vol 9, Issue 1, p1
- ISSN
2056-6387
- Publication type
Article
- DOI
10.1038/s41534-023-00781-x