Broadband SNAIL parametric amplifier with microstrip impedance transformer

Josephson parametric amplifiers are an important part of a modern superconducting quantum computing platform and squeezed states generation devices. Traveling wave impedance-matched provide broad bandwidth for high-fidelity single-shot readout multiple qubit circuits. Here, we present quantum-limited 3-wave-mixing amplifier based on nonlinear asymmetric inductive elements (SNAILs), whose useful is enhanced with on-chip two-section impedance-matching circuit microstrip transmission lines. The dynamic range increased using array 67 SNAILs 268 junctions, forming quarter-wave resonator. Operating in current-pumped mode, experimentally demonstrate average gain 17 dB across 300 MHz bandwidth, along saturation power –100 dBm, which can go as high −97 dBm noise performance. Moreover, the be fabricated simple technology just one e-beam lithography step.