A Traveling-Wave Parametric Amplifier With Integrated Diplexers

TL;DR

This paper introduces a compact, scalable traveling-wave parametric amplifier with integrated on-chip diplexers for pump routing, reducing loss and system complexity in superconducting circuit readout.

Contribution

It presents a novel co-fabricated architecture that integrates diplexers on-chip, enhancing scalability and reducing losses compared to traditional off-chip components.

Findings

Integrated diplexers enable on-chip pump routing.

The design improves scalability and reduces system complexity.

Potential for enhanced performance in superconducting circuit readout.

Abstract

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.