Broadband flux-pumped Josephson parametric amplifier with an on-chip coplanar waveguide impedance transformer

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 600 MHz with a gain above 15 dB, 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 1 GHz.

Automated summary

A broad-band flux-pumped Josephson parametric amplifier with an on-chip coplanar waveguide impedance transformer is proposed for scalable quantum processors. The device achieves an operational bandwidth over 600 MHz with a gain above 15 dB, high saturation power, and quantum-limited noise performance. Additionally, its center frequency can be tuned over several hundred megahertz, broadening the effective operational bandwidth to around 1 GHz.