High-performance multiplexed readout of superconducting qubits with a tunable broadband Purcell filter
Yuzhe Xiong, Zilin Wang, Jiawei Zhang, Xuandong Sun, Zihao Zhang, Peisheng Huang, Yongqi Liang, Ji Jiang, Jiawei Qiu, Yuxuan Zhou, Xiayu Linpeng, Wenhui Huang, Jingjing Niu, Youpeng Zhong, Ji Chu, Song Liu, Dapeng Yu
DOI 10.1103/ykvq-bkfk · Physical Review Applied
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Abstract
Fast, high-fidelity, and low-backaction readout plays a crucial role in the advancement of quantum error correction (QEC). Here we demonstrate high-performance multiplexed readout of superconducting qubits using a tunable broadband Purcell filter, effectively resolving the fundamental trade-off between measurement speed and photon noise–induced dephasing. By dynamically tuning the filter parameters, we suppress photon noise–induced dephasing by a factor of 7 in idle status, while enabling rapid, high-fidelity readout during measurement. Using 100 ns readout pulses, we achieve low crosstalk simultaneous readout of three qubits with a relaxation-limited average fidelity of 99.5%. By using a multilevel readout technique, we overcome the relaxation constraint and achieve a fidelity of 99.9% with a 50 ns readout pulse. The system also exhibits high-performance quantum-nondemolition characteristics, maintaining 99.4% fidelity over repeated measurements with a qubit state leakage rate below 0.1%. Building on the tunable filter, we further propose a scalable readout scheme for surface code implementation with enhanced multiplexing capability, providing a promising pathway toward fast and scalable QEC.
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