The detection of magnons and their quantum properties, especially in antiferromagnetic (AFM) materials, is a substantial step to realize many ambitious advances in the study of nanomagnetism and the development of energy efficient quantum technologies. The recent development of hybrid systems based on superconducting circuits provides the possibility of engineering quantum sensors that exploit different degrees of freedom. Here, we examine the magnon-photon-transmon hybridisation based on bipartite AFM materials, which gives rise to an effective coupling between a transmon qubit and magnons in a bipartite AFM. We demonstrate how magnetically invisible magnon modes, their chiralities and quantum properties such as nonlocality and two-mode magnon entanglement in bipartite AFMs can be characterized through the Rabi frequency of the superconducting transmon qubit.
@article{arxiv.2302.13167,
title = {Transmon probe for quantum characteristics of magnons in antiferromagnets},
author = {Vahid Azimi-Mousolou and Anders Bergman and Anna Delin and Olle Eriksson and Manuel Pereiro and Danny Thonig and Erik Sjöqvist},
journal= {arXiv preprint arXiv:2302.13167},
year = {2023}
}