Broadband Flux-Pumped Josephson Parametric Amplifier with an On-Chip Coplanar Waveguide Impedance Transformer
APPLIED PHYSICS EXPRESS（2021）
Univ Sci & Technol China
Abstract
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.
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Key words
parametric amplifier,quantum computing,impedance engineering,quantum limited
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