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We investigate the required embedding networks to enable ideal performancefor a high-gain travelling-wave parametric amplifier (TWPA) based on three-wavemixing (3WM). By embedding the TWPA in a network of superconducting diplexersand hybrid couplers, the amplifier can deliver a high stable gain withnear-quantum-limited noise performance, with suppressed gain ripples, whileeliminating the reflections of the signal, the idler and the pump as well asthe transmission of all unwanted tones. We demonstrate a configuration wherethe amplifier can isolate. We call this technique Wideband Idler Filtering(WIF). The theory is supported by simulations that predict over 20 dB gain inthe band 4-8 GHz with 10 dB isolation for a single amplifier and 30 dBisolation for two cascaded amplifiers. We demonstrate how the WIF-TWPAs can beused to construct switchable isolators with over 40 dB isolation over the fullband 4-8 GHz. We also propose an alternative design where the WIF can beimplemented without diplexers. Finally we show how, with small modifications,the technique can be implemented for four-wave mixing (4WM) TWPAs as well.

Embedding networks for ideal performance of a travelling-wave parametric amplifier