Bimodal Approach for Noise Figures of Merit Evaluation in Quantum-Limited Josephson Traveling Wave Parametric Amplifiers

TL;DR

This paper introduces a bimodal theoretical framework to evaluate noise figures of merit in quantum-limited Josephson traveling wave parametric amplifiers, analyzing their amplification properties and noise behavior with different input states.

Contribution

It provides a novel bimodal analysis approach for Josephson TWPAs, focusing on intrinsic properties and noise performance with thermal fluctuations.

Findings

Bimodal description effectively characterizes amplification and noise.

Thermal noise influences output signals significantly.

Model applies to key quantum states like Fock and coherent states.

Abstract

The advent of ultra-low noise microwave amplifiers revolutionized several research fields demanding quantum-limited technologies. Exploiting a theoretical bimodal description of a linear phase-preserving amplifier, in this contribution we analyze some of the intrinsic properties of a model architecture (i.e., an rf-SQUID based Josephson Traveling Wave Parametric Amplifier) in terms of amplification and noise generation for key case study input states (Fock and coherents). Furthermore, we present an analysis of the output signals generated by the parametric amplification mechanism when thermal noise fluctuations feed the device.