Low loss resonant-phase-matched Josephson traveling wave parametric amplifier

Josephson Traveling-Wave Parametric Amplifier (JTWPA), featuring large gain, high dynamic range, and quantum-limited added noise, is well suited for frequency-multiplexed readout of superconducting qubits. Resonant phase matching is a widely used technique to achieve efficient broadband parametric amplification, but requires small parameters scattering, including the resonator frequencies. In this talk, we will show resonant-phase-matched four-wave-mixing JTWPAs based on Josephson transmission with a stopband narrower than 50 MHz. The amplifier exhibits 20 dB of parametric gain over a broadband frequency range, near-quantum-limited added noise, and a 1-dB compression point close to -100 dBm on-chip.