Magnon-mediated spin entanglement in the strong-coupling regime

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