The rapid progress towards scalable quantum processors demands amplifiers with large bandwidths and high saturation powers. For this purpose, we present a broadband flux-pumped Josephson parametric amplifier integrated with an on-chip coplanar waveguide impedance transformer. Our device can be fabricated with simple and straightforward photo-lithography. This device experimentally achieves an operational bandwidth over 600MHz with a gain above 15dB, and a high saturation power with quantum-limited noise performance. In addition, the center frequency of this device can be tuned over several hundred megahertz, which in turn broadens the effective operational bandwidth to around 1GHz.

可扩展量子处理器的快速发展需要具有大带宽和高饱和功率的放大器。为此，我们提出了一种与片上共面波导阻抗变换器集成的宽带磁通泵浦约瑟夫森参量放大器。我们的设备可以用简单直接的光刻法制造。该器件通过实验实现了超过 600MHz 的操作带宽，增益超过 15dB，以及具有量子限制噪声性能的高饱和功率。此外，该设备的中心频率可以在数百兆赫兹以上进行调谐，从而将有效操作带宽扩大到 1GHz 左右。