High Power Josephson Parametric Amplifiers with GHz Bandwidth

Josephson parametric amplifiers offer quantum-limited noise performance at microwave frequencies. Traditionally, Josephson parametric amplifiers (JPA) have been limited in their bandwidth and saturation powers, or alternatively have required a large number of junctions in a traveling-wave architecture. Here we show that by using established impedance matching techniques, the JPA bandwidth can be increased from the common 10 MHz range to over 1.5 GHz at 20 dB gain. By replacing the amplifier junctions with rf-SQUID arrays with moderate junction count, we can additionally improve the amplifier saturation power to -90 dBm. We will discuss the amplifier design principles and flow, present reference schematics, and compare calculated and simulated gain and saturation characteristics.