1. Demonstrating quantum error mitigation on logical qubits
- Author
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Zhang, Aosai, Xie, Haipeng, Gao, Yu, Yang, Jia-Nan, Bao, Zehang, Zhu, Zitian, Chen, Jiachen, Wang, Ning, Zhang, Chuanyu, Zhong, Jiarun, Xu, Shibo, Wang, Ke, Wu, Yaozu, Jin, Feitong, Zhu, Xuhao, Zou, Yiren, Tan, Ziqi, Cui, Zhengyi, Shen, Fanhao, Li, Tingting, Han, Yihang, He, Yiyang, Liu, Gongyu, Shen, Jiayuan, Wang, Han, Wang, Yanzhe, Dong, Hang, Deng, Jinfeng, Li, Hekang, Wang, Zhen, Song, Chao, Guo, Qiujiang, Zhang, Pengfei, Li, Ying, and Wang, H.
- Subjects
Quantum Physics - Abstract
A long-standing challenge in quantum computing is developing technologies to overcome the inevitable noise in qubits. To enable meaningful applications in the early stages of fault-tolerant quantum computing, devising methods to suppress post-correction logical failures is becoming increasingly crucial. In this work, we propose and experimentally demonstrate the application of zero-noise extrapolation, a practical quantum error mitigation technique, to error correction circuits on state-of-the-art superconducting processors. By amplifying the noise on physical qubits, the circuits yield outcomes that exhibit a predictable dependence on noise strength, following a polynomial function determined by the code distance. This property enables the effective application of polynomial extrapolation to mitigate logical errors. Our experiments demonstrate a universal reduction in logical errors across various quantum circuits, including fault-tolerant circuits of repetition and surface codes. We observe a favorable performance in multi-round error correction circuits, indicating that this method remains effective when the circuit depth increases. These results advance the frontier of quantum error suppression technologies, opening a practical way to achieve reliable quantum computing in the early fault-tolerant era.
- Published
- 2025