Magnon mediated spin entanglement in the strong coupling regime

TL;DR

This paper demonstrates that two spin defects can be entangled via magnon polariton modes in an antiferromagnetic layer, utilizing strong coupling to enable quantum information applications.

Contribution

It introduces a method for entangling spin defects through magnon polaritons in the strong coupling regime, with detailed analysis of the layer's thickness effects.

Findings

High Purcell factor enhances spin relaxation via magnon polaritons.

Oscillatory population exchange indicates strong light-matter coupling.

Thinner AF layers facilitate long-range spin interactions.

Abstract

We present that two spin defects (SDs) can be entangled through a magnon polariton mode, within the strong coupling regime. The magnonic modes are provided by an antiferromagnetic (AF) MnF$_{2}$ layer and their dispersion is characterized by the layer's thickness. The macroscopic quantum electrodynamics theory is used to describe the light-matter interactions, where the Green's functions are its core element. The individual SD relaxes by exciting the magnon polariton modes, exhibiting high enhancement values of the Purcell factor. When two SDs are considered, an oscillatory population exchange is observed between them, a sign of strong light-matter coupling, where the concurrence value is used to quantify the level of entanglement. The thinner AF layers can potentially be used to promote interactions between multiple spins through long range coupling, this is a desired feature to fabricate high demand applications in the fields of quantum measurement and computation.