A compact design for the Josephson mixer: The lumped element circuit
Jean-Damien Pillet, Emmanuel Flurin, F. Mallet, Benjamin Huard · Applied Physics Letters · 2015
We present a compact and efficient design in terms of gain, bandwidth, and dynamical range for the Josephson mixer, the superconducting circuit performing three-wave mixing at microwave frequencies. In an all lumped-element based circuit with galvanically coupled ports, we demonstrate nondegenerate amplification for microwave signals over a bandwidth up to 50 MHz for a power gain of 20 dB. The quantum efficiency of the mixer is shown to be about 70%, and its saturation power reaches −112 dBm.