Lumped-element two-section impedance-matched SNAIL parametric amplifier

TL;DR

This paper introduces a novel lumped-element SNAIL parametric amplifier with impedance matching transformers, achieving high gain, broad bandwidth, and quantum-limited noise performance for quantum measurement applications.

Contribution

It presents a new design of a flux-pumped SNAIL amplifier with impedance matching transformers, demonstrating improved bandwidth and noise characteristics over previous designs.

Findings

Achieved 15 dB gain over 600 MHz bandwidth

Demonstrated quantum-limited noise temperature

Attained saturation power of -107 dBm

Abstract

Broadband impedance-matched Josephson parametric amplifiers are key components for high-fidelity single-shot multi-qubit readout. Nowadays, several types of impedance matched parametric amplifiers have been proposed: the first is an impedance-matched parametric amplifier based on a Klopfenstein taper, and the second is an impedance-matched parametric amplifier based on auxiliary resonators. Here, we present the quantum-limited 3-wave-mixing lumped-element SNAIL parametric amplifier with two-units impedance matching transformer. A two-pole Chebyshev matching network with shunted resonators based on parallel-plate capacitors and superconducting planar coil. Operating in a flux-pumped mode, we experimentally demonstrate an average gain of $15dB$ across a $600MHz$ bandwidth, along with an average saturation power of $-107dBm$ and quantum-limited noise temperature.