# QED with magnetic textures

## TL;DR

This paper develops a theoretical framework for coupling magnetic textures like vortices and skyrmions in ferromagnetic nanodiscs with photons in circuits, enabling broadband spectroscopy and potential strong coupling regimes for quantum information applications.

## Contribution

It introduces a new theory for photon-magnetic texture interactions in circuits, facilitating spectroscopy and strong coupling analysis.

## Key findings

- Broadband spectroscopy of magnetic textures is possible via photon transmission.
- Strong coupling regime between magnetic textures and single photons can be achieved.
- Theoretical foundation for quantum information processing with magnetic textures.

## Abstract

Coherent exchange between photons and different matter excitations (like qubits, acoustic surface waves or spins) allows for the entanglement of light and matter and provides a toolbox for performing fundamental quantum physics. On top of that, coherent exchange is a basic ingredient in the majority of quantum information processors. In this work, we develop the theory for coupling between magnetic textures (vortices and skyrmions) stabilized in ferromagnetic nanodiscs and photons generated in a circuit. In particular, we show how to perform broadband spectroscopy of the magnetic textures by sending photons through a transmission line and recording the transmission. We also discuss the possibility of reaching the strong coupling regime between these texture excitations and a single photon residing in a cavity.