Entanglement between two remote macroscopic magnon spheres induced by atomic coherence
Phys. Rev. A 113, 023722 – Published 25 February, 2026
DOI: https://doi.org/10.1103/pht5-1r54
Abstract
We propose a protocol to generate entanglement between two remote magnon modes by coupling two macroscopic Kerr yttrium iron garnet (YIG) spheres and an atom to an odd-numbered cavity chain. The atom is placed in the middle cavity chain, while the two YIG spheres are symmetrically positioned on opposite sides. We derive the master equation of the YIG spheres and the atom and obtain its analytical solution. If the dissipations of the cavity chain, of the YIG spheres, and of the atom can all be ignored, a pure two-mode squeezed Schrödinger-cat state is obtained by measuring the atomic level. We also show that the Kerr nonlinearity, on the one hand, improves the entanglement and, on the other hand, enhances the mean magnon number.
