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Fast joint parity measurement via collective interactions induced by stimulated emission

Author

Listed:
  • Sainan Huai

    (Tencent)

  • Kunliang Bu

    (Tencent)

  • Xiu Gu

    (Tencent)

  • Zhenxing Zhang

    (Tencent)

  • Shuoming An

    (Tencent)

  • Xiaopei Yang

    (Tencent)

  • Yuan Li

    (Tencent)

  • Tianqi Cai

    (Tencent)

  • Yicong Zheng

    (Tencent)

Abstract

Parity detection is essential in quantum error correction. Error syndromes coded in parity are detected routinely by sequential CNOT gates. Here, different from the standard CNOT-gate based scheme, we propose a reliable joint parity measurement (JPM) scheme inspired by stimulated emission. By controlling the collective behavior between data qubits and syndrome qubit, we realize the parity detection and experimentally implement the weight-2 and weight-4 JPM scheme in a tunable coupling superconducting circuit, which shows comparable performance to the CNOT scheme. Moreover, with the aid of the coupling tunability in quantum system, this scheme can be further utilized for specific joint entangling state preparation (JEP) with high fidelity, such as multiqubit entangled state preparation for non-adjacent qubits. This strategy, combined with the superconducting qubit system with tunable couplers, reveals tremendous potential and applications in the surface code architecture without adding extra circuit elements. Besides, the method we develop here can readily be applied in large-scale quantum computation and quantum simulation.

Suggested Citation

  • Sainan Huai & Kunliang Bu & Xiu Gu & Zhenxing Zhang & Shuoming An & Xiaopei Yang & Yuan Li & Tianqi Cai & Yicong Zheng, 2024. "Fast joint parity measurement via collective interactions induced by stimulated emission," Nature Communications, Nature, vol. 15(1), pages 1-8, December.
    • Handle: RePEc:nat:natcom:v:15:y:2024:i:1:d:10.1038_s41467-024-47379-1
    DOI: 10.1038/s41467-024-47379-1
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    References listed on IDEAS

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