Josephson Parametric Amplifier with Sn-InAs nanowires

Josephson parametric amplifiers (JPAs) are essential components in circuit quantum electrodynamics (cQED) experiments, providing crucial signal amplification for superconducting qubit measurements and quantum feedback control. They are typically employed as a first amplifier in the chain to boost signal-to-noise ratios (SNR) of the weak microwave signals at cryogenic temperatures for reliable room temperature processing. Recent advancements in semiconducting Josephson junctions (JJs) have attracted attention as a means to provide weak anharmonic non-linearity in JPA circuits, offering electrostatic control for frequency tunability. This approach provides a more localized and less disruptive alternative to magnetic flux tuning, which is typically used in contemporary cQED systems. Our previous research on Sn-InAs nanowires demonstrated Josephson supercurrents up to approximately 0.5 µA, suggesting their portential for JPA implementations with nanowire junctions. In this work, we present our progress in developing and characterizing JPAs that leverage the fourth-order non-linearity of these nanowire junctions. These devices are integrated into overcoupled NbTiN co-planar waveguide resonators and measured in reflection. Amplification upto 10dB is achieved through four-wave mixing processes. Additionally, we investigate the Kerr non-linearity, saturation power, and assess the SNR improvements provided by these amplifiers.