Fast joint parity measurement via collective interactions induced by stimulated emission

Sainan Huai, Kunliang Bu, Xiu Gu (), Zhenxing Zhang, Shuoming An, Xiaopei Yang, Yuan Li, Tianqi Cai () and Yicong Zheng
Additional contact information
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

Nature Communications, 2024, vol. 15, issue 1, 1-8

Abstract: 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.

Date: 2024
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DOI: 10.1038/s41467-024-47379-1

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