Frequency-Tunable Nonlinear Purcell Filter

Fast Reset & High-Fidelity Readout

This filter dynamically tunes the readout resonator linewidth, achieving 99.3% readout fidelity without a quantum-limited amplifier, while enabling unconditional reset of leakage and excited states within 200 ns and mitigating photon-induced dephasing and Purcell decay.

Yong-Xi, Xiao · Xu, Gu · Han, Liang · Wang, Chuan · Zhen-Yu, Peng · Chen, Bing · Yu, Yan · Mei, Zheng · Si-Lu, Zhao · Zhou, Bu · Deng, Cheng · Yang, Kai · Tian, Ye · Song, Xiaohui · Zheng, Dongning · Xiang-Yu, Zhang · Shi, Yun · Xiang, Zhongcheng · Xu, Kai · Fan, Heng

Physical Review Letters 2026

Specifications

无量子限制放大器下读取保真度

{'zh': '99.3', 'en': ''} %

within ns error

{'zh': '≤1', 'en': '≤1'} %

Advantages

Reset of |1⟩ state within 75 ns

Compatible with multi-qubit readout and reset