Author
Listed:
- Zhongchu Ni
(Southern University of Science and Technology
Southern University of Science and Technology
Southern University of Science and Technology)
- Sai Li
(Southern University of Science and Technology
Southern University of Science and Technology)
- Xiaowei Deng
(Southern University of Science and Technology
Southern University of Science and Technology)
- Yanyan Cai
(Southern University of Science and Technology
Southern University of Science and Technology)
- Libo Zhang
(Southern University of Science and Technology
Southern University of Science and Technology)
- Weiting Wang
(Tsinghua University)
- Zhen-Biao Yang
(Fuzhou University)
- Haifeng Yu
(Beijing Academy of Quantum Information Sciences)
- Fei Yan
(Southern University of Science and Technology
Southern University of Science and Technology)
- Song Liu
(Southern University of Science and Technology
Southern University of Science and Technology
Hefei National Laboratory)
- Chang-Ling Zou
(University of Science and Technology of China
Hefei National Laboratory)
- Luyan Sun
(Tsinghua University
Hefei National Laboratory)
- Shi-Biao Zheng
(Fuzhou University)
- Yuan Xu
(Southern University of Science and Technology
Southern University of Science and Technology
Hefei National Laboratory)
- Dapeng Yu
(Southern University of Science and Technology
Southern University of Science and Technology
Southern University of Science and Technology
Hefei National Laboratory)
Abstract
Quantum error correction (QEC) aims to protect logical qubits from noises by using the redundancy of a large Hilbert space, which allows errors to be detected and corrected in real time1. In most QEC codes2–8, a logical qubit is encoded in some discrete variables, for example photon numbers, so that the encoded quantum information can be unambiguously extracted after processing. Over the past decade, repetitive QEC has been demonstrated with various discrete-variable-encoded scenarios9–17. However, extending the lifetimes of thus-encoded logical qubits beyond the best available physical qubit still remains elusive, which represents a break-even point for judging the practical usefulness of QEC. Here we demonstrate a QEC procedure in a circuit quantum electrodynamics architecture18, where the logical qubit is binomially encoded in photon-number states of a microwave cavity8, dispersively coupled to an auxiliary superconducting qubit. By applying a pulse featuring a tailored frequency comb to the auxiliary qubit, we can repetitively extract the error syndrome with high fidelity and perform error correction with feedback control accordingly, thereby exceeding the break-even point by about 16% lifetime enhancement. Our work illustrates the potential of hardware-efficient discrete-variable encodings for fault-tolerant quantum computation19.
Suggested Citation
Zhongchu Ni & Sai Li & Xiaowei Deng & Yanyan Cai & Libo Zhang & Weiting Wang & Zhen-Biao Yang & Haifeng Yu & Fei Yan & Song Liu & Chang-Ling Zou & Luyan Sun & Shi-Biao Zheng & Yuan Xu & Dapeng Yu, 2023.
"Beating the break-even point with a discrete-variable-encoded logical qubit,"
Nature, Nature, vol. 616(7955), pages 56-60, April.
Handle:
RePEc:nat:nature:v:616:y:2023:i:7955:d:10.1038_s41586-023-05784-4
DOI: 10.1038/s41586-023-05784-4
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Citations
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Cited by:
- Bingzhi Zhang & Junyu Liu & Xiao-Chuan Wu & Liang Jiang & Quntao Zhuang, 2024.
"Dynamical transition in controllable quantum neural networks with large depth,"
Nature Communications, Nature, vol. 15(1), pages 1-12, December.
- X. L. He & Yong Lu & D. Q. Bao & Hang Xue & W. B. Jiang & Z. Wang & A. F. Roudsari & Per Delsing & J. S. Tsai & Z. R. Lin, 2023.
"Fast generation of Schrödinger cat states using a Kerr-tunable superconducting resonator,"
Nature Communications, Nature, vol. 14(1), pages 1-10, December.
- Zenghui Bao & Yan Li & Zhiling Wang & Jiahui Wang & Jize Yang & Haonan Xiong & Yipu Song & Yukai Wu & Hongyi Zhang & Luming Duan, 2024.
"A cryogenic on-chip microwave pulse generator for large-scale superconducting quantum computing,"
Nature Communications, Nature, vol. 15(1), pages 1-9, December.
- Yao Lu & Aniket Maiti & John W. O. Garmon & Suhas Ganjam & Yaxing Zhang & Jahan Claes & Luigi Frunzio & Steven M. Girvin & Robert J. Schoelkopf, 2023.
"High-fidelity parametric beamsplitting with a parity-protected converter,"
Nature Communications, Nature, vol. 14(1), pages 1-11, December.
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