Beating the break-even point by repetitive quantum error correction on a photonic qubit

ORAL

Abstract

Quantum error correction (QEC) aims for protecting logic qubits from noises by feedback control. To benefit from QEC, a redundantly encoded logic qubit needs to have a lifetime otherwise unavailable--surpass the "break-even" point. Most QEC codes work by repetitively performing feedback-control cycles, where an error, once occurs, is corrected in real time. Such repetitive QEC demonstrations have been reported on various platforms, but where the break-even point remains to be reached yet. Here we demonstrate a QEC procedure with a logic qubit binomially-encoded in a microwave cavity, dispersively coupled to an ancilla superconducting qubit. By applying a pulse featuring an ingeniously tailored frequency comb to the ancilla, we extract the error syndrome robustly and perform repetitive QEC, thereby exceeding the break-even point by 20%.

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Presenters

  • Yuan Xu

    • Southern University of Science and Techn

Authors

  • Yuan Xu

    • Southern University of Science and Techn

  • Zhongchu Ni

    • Southern University of Science and Techn

  • Sai Li

    • South China Normal University
    • Southern Unversity of Science and Technology

  • Xiaowei Deng

    • Southern University of Science and Technology

  • Yanyan Cai

    • Southern University of Science and Technology

  • Libo Zhang

    • Southern University of Science and Techn
    • Southern University of Science and Technology

  • Weiting Wang

    • Tsinghua University

  • Zhen-Biao Yang

    • Fuzhou University

  • Haifeng Yu

    • Beijing Academy of Quantum Information Sciences
    • Beijing academy of quantum information sciences, Beijing, China

  • Fei Yan

    • Southern University of Science and Techn
    • Southern University of Science and Technology

  • Song Liu

    • Southern University of Science and Techn
    • Southern University of Science and Technology

  • Chang-Ling Zou

    • University of Science and Technology of China
    • Key Laboratory of Quantum Information, CAS, University of Science and Technology of China

  • Luyan Sun

    • Tsinghua University

  • Shi-Biao Zheng

    • Fuzhou University

  • Dapeng Yu

    • SUSTC
    • Southern University of Science and Technology