Magnons can endow quantum devices with new functionalities. Assessing their potential requires precise characterization of magnon properties. Here, we use a superconducting qubit to probe magnons in a ferrimagnet over a range of about 2000 excitations. Using qubit control and parametrically induced qubit-magnon interactions we demonstrate few-excitation sensitive detection of magnons and are able to accurately resolve their decay. These results introduce quantum circuits as high-dynamic range probes for magnons and provide an avenue toward sensitive detection of nontrivial magnon dynamics.
@article{arxiv.2412.11859,
title = {High dynamic-range quantum sensing of magnons and their dynamics using a superconducting qubit},
author = {Sonia Rani and Xi Cao and Alejandro E. Baptista and Axel Hoffmann and Wolfgang Pfaff},
journal= {arXiv preprint arXiv:2412.11859},
year = {2025}
}