Frequency Tunable Josephson Traveling Wave Parametric Amplifier with Nondegenerate Pump Phase Matching

Resonantly phase-matched Josephson traveling wave parametric amplifiers (JTWPAs) with gigahertz of bandwidth and near-quantum limited noise performance are now widely used in superconducting quantum computing experiments. For such conventional single-pump JTWPAs, resonators are critical to cancel phase mismatch from both the normal group velocity dispersion and the nonlinear phase modulations. However, these resonators make up half of the device footprint, require high fabrication uniformity, and fix the device operating frequency. Here we develop a resonator-free, dual-pump JTWPA with a reduced footprint, wider bandwidth, but comparable gain, dynamic range, and noise performance. In contrast to the resonant phase matching technique, our dual-pump scheme generates a linear phase mismatch which naturally compensates the nonlinear phase mismatch. In addition to their larger fabrication tolerance, these dual-pump JTWPAs have dynamically reconfigurable frequency bands controlled by the frequency detuning of the two pumps. These devices will open up new possibilities for tunable amplification, both phase sensitive and preserving, applicable to cQED and higher-frequency cosmological applications.