Heitler effect and resonance fluorescence in quantum magnonics

TL;DR

This paper explores a coupled qubit-magnon system revealing a zero-linewidth peak at the driving frequency, analogous to the Heitler effect, indicating potential for coherent magnon source development.

Contribution

It demonstrates the presence of a Heitler-like effect in quantum magnonics, showing spectral features at the driving frequency in a coupled qubit-magnon system.

Findings

Spectral responses include sidebands and a zero-linewidth peak at the drive frequency.

The effect persists at both strong and weak coupling regimes.

Potential implications for coherent magnon source development.

Abstract

We consider a coupled system of a qubit and a magnon mode in which the qubit is weakly driven. We demonstrate that the spectral steady-state responses of both the qubit and the magnon show, in addition to two sidebands split by the coupling, also a peak at the driving frequency with virtually zero linewidth. This phenomenon, which persists at both strong and weak coupling, is an analog of the Heitler effect in atomic physics, and shows the path towards building of coherent magnon sources.