Chiral coupling at the single-quantum level promises to be a remarkable potential for quantum information processing. Here we propose to achieve a chiral interaction between a magnon mode in a ferromagnetic sphere and a superconducting qubit mediated by a one-dimensional coupled-cavity array. When the qubit is coupled to two lattice sites of the array and each one is encoded with a tunable phase, we can acquire a directional qubit-magnon interaction via the quantum interference effect. This work opens up a new route to construct chiral devices, which are expected to become a building block in quantum magnonic networks.
@article{arxiv.2211.05285,
title = {Chiral coupling between a ferromagnetic magnon and a superconducting qubit},
author = {Ya-long Ren and Sheng-li Ma and Fu-li Li},
journal= {arXiv preprint arXiv:2211.05285},
year = {2022}
}