The aim of this work package is to develop a broadband Josephson traveling wave parametric amplifier (JTWPA) utilizing three-wave mixing in Nb and Al technology. The development will include optimisation of circuit design parameters and physical layout, the optimisation of the fabrication technology and the preparation of functional samples for WP2, WP3 and for the applications envisaged in WP4. With feedback from WP2 the design parameters, the physical layout and the fabrication technology will be continuously optimised during the lifetime of the JRP. In addition, a computer model of three-wave mixing in Josephson metamaterials will be developed.

The final goal is to prepare samples with a power gain of 20 dB and flatness of ±3 dB in a one octave range centred on 5 to 6 GHz, clearly outperforming state-of-the-art parametric amplifiers with respect to simultaneously achieving large gain and high bandwidth.