Niobium-based lumped element SNAIL parametric amplifiers with improved power handling capacity*

Parametric amplifiers based on Josephson junctions play a crucial role in superconducting quantum information processing. Resonator-based amplifiers, such as the Josephson parametric amplifier (JPA), the Josephson Parametric Converter (JPC) and the SNAIL parametric amplifier (SPA), are widely used due to their ease of operation and near quantum-limited noise performance. It has been shown that the compression power of these amplifiers, an increasingly desirable feature, increases quadratically with the resonator linewidth and inversely with the fourth-order non-linearity (Kerr) of their Josephson elements. In this talk, we present SPAs with lumped element resonators fabricated by niobium tri-layer technology. In these new devices, the Kerr nonlinearity is reduced while the junction participation ratio is increased, compared to the devices fabricated with single layer, aluminum technology. This resulted in a 10 dB improvement in compression power and more than twice larger bandwidth. We also discuss further improvement of these devices which, in the long run, would service most of the needs of the superconducting quantum circuits community.