一种在宽频带内具有高信噪比提升的小占用面积行波参量放大器
A small footprint travelling-wave parametric amplifier with a high Signal-to-Noise Ratio improvement in a wide band
AI总结：
本文提出一种基于SNAILs和平行板电容器的小占用面积行波参量放大器，通过3WM与RPM等技术，在3 GHz带宽内实现19 dB增益和10 dB信噪比提升，显著加速了量子比特读取。
摘要：
我们表征了一种小占用面积的行波参量放大器（TWPA）。该TWPA由磁通可调谐的超导非线性非对称电感元件（SNAILs）和平行板电容器构建。它实现了三波混频（3WM）与谐振相位匹配（RPM），采用小截止频率以实现高单位单元增益，并采用阻抗匹配网络以实现大带宽阻抗匹配。该器件具有200个单元，物理占用面积仅为1.1 mm^2，却在3 GHz带宽内展现出19 dB的平均参量增益、10 dB的平均有效信噪比提升，以及量子比特读取时间的明显加速。
英文摘要：
We characterise a small footprint travelling-wave parametric amplifier (TWPA). The TWPA is built with magnetically flux-tunable superconducting nonlinear asymmetric inductive elements (SNAILs) and parallel-plate capacitors. It implements three-wave mixing (3WM) with resonant phase matching (RPM), a small cutoff frequency for high gain per unitcell and impedance matching networks for large bandwidth impedance matching. The device has 200 unitcells and a physical footprint of only 1.1 mm^2, yet demonstrates an average parametric gain of 19 dB over a 3 GHz bandwidth, an average effective signal-to-noise ratio improvement of 10 dB and a clear speedup of qubit readout time.
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