Three-wave mixing Josephson traveling wave parametric amplifiers with integrated parametric pump coupler circuits

We present our latest results on Josephson traveling wave parametric amplifiers (TWPAs, [1]), which are currently in testing at operation frequencies of 750 MHz and 1500 MHz. These TWPAs have potential applications in, e.g., the readout of sensors and spin qubits. Due to the unavailability of multi-octave cryogenic circulators at low radio frequencies, we are considering diplexers for the coupling of a pump tone in and out of the device. We describe the integration of diplexers into our TWPA sample holders, followed by standalone testing at cryogenic temperatures. Experimental characterization of the TWPAs will also be discussed.

[1] M.R. Perelshtein, K.V. Petrovnin, V. Vesterinen, et al. "Broadband Continuous-Variable Entanglement Generation Using a Kerr-Free Josephson Metamaterial". Phys. Rev. Applied 18, 024063 (2022).