Error per single-qubit gate below $10^{-4}$ in a superconducting qubit
zqyin 添加于 2023-2-20 14:49
| 547 次阅读 | 0 个评论
作 者
Li Z, Liu P, Zhao P, Mi Z, Xu H, Liang X, Su T, Sun W, Xue G, Zhang J-N, Liu W, Jin Y, Yu H
摘 要
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 fabric a transmon qubit with long coherence times and demonstrate single-qubit gates with the average gate error below $10^{-4}$, i.e. $(7.42pm0.04)times10^{-5}$ by randomized benchmarking (RB). To understand the error sources, we experimentally obtain an error budget, consisting of the decoherence errors lower bounded by $(4.62pm0.04)times10^{-5}$ and the leakage rate per gate of $(1.16pm0.04)times10^{-5}$. 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 fedlities 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. -
详细资料
- 关键词: quant-ph
- 文献种类:手稿
- 期卷页: 2023年
- 日期: 2023-02-17
- 发布方式: arXiv e-prints
- 备注:http://arxiv.org/abs/2302.08690v1
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