Fluxonium: an alternative qubit platform for high-fidelity operations
Abstract
Superconducting qubits provide a promising path toward building large-scale quantum computers. The simple and robust transmon qubit has been the leading platform, achieving multiple milestones. However, fault-tolerant quantum computing calls for qubit operations at error rates significantly lower than those exhibited in the state of the art. Consequently, alternative superconducting qubits with better error protection have attracted increasing interest. Among them, fluxonium is a particularly promising candidate, featuring large anharmonicity and long coherence times. Here, we engineer a fluxonium-based quantum processor that integrates high qubit-coherence, fast frequency-tunability, and individual-qubit addressability for reset, readout, and gates. With simple and fast gate schemes, we achieve an average single-qubit gate fidelity of 99.97% and a two-qubit gate fidelity of up to 99.72%. This performance is comparable to the highest values reported in the literature of superconducting circuits. Thus our work, for the first time within the realm of superconducting qubits, reveals an approach toward fault-tolerant quantum computing that is alternative and competitive to the transmon system.
Keywords
Cite
@article{arxiv.2111.13504,
title = {Fluxonium: an alternative qubit platform for high-fidelity operations},
author = {Feng Bao and Hao Deng and Dawei Ding and Ran Gao and Xun Gao and Cupjin Huang and Xun Jiang and Hsiang-Sheng Ku and Zhisheng Li and Xizheng Ma and Xiaotong Ni and Jin Qin and Zhijun Song and Hantao Sun and Chengchun Tang and Tenghui Wang and Feng Wu and Tian Xia and Wenlong Yu and Fang Zhang and Gengyan Zhang and Xiaohang Zhang and Jingwei Zhou and Xing Zhu and Yaoyun Shi and Jianxin Chen and Hui-Hai Zhao and Chunqing Deng},
journal= {arXiv preprint arXiv:2111.13504},
year = {2022}
}