Traveling-Wave Parametric Amplifiers (TWPAs) are ubiquitous in superconducting circuit readout, providing high gain with near-quantum-limited noise performance across a wide bandwidth. Their operation, however, relies on a strong microwave pump tone that is typically delivered using off-chip passive components, such as directional couplers or diplexers. These external elements add loss, increase system complexity, and limit scalability. Here, we present a traveling-wave parametric amplifier that incorporates on-chip input and output diplexers for pump routing. This co-fabricated architecture offers a compact and scalable solution for superconducting-circuit readout.
@article{arxiv.2603.12327,
title = {A Traveling-Wave Parametric Amplifier With Integrated Diplexers},
author = {C. Denney and K. Genter and K. Cicak and J. D. Teufel and J. Aumentado and F. Lecocq and M. Malnou},
journal= {arXiv preprint arXiv:2603.12327},
year = {2026}
}