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We present a scheme to entangle two magnon modes in two macroscopicyttrium-iron-garnet spheres. The two spheres are placed inside two microwavecavities, which are driven by a two-mode squeezed microwave field. By using thelinear state-swap interaction between the cavity and the magnon mode in eachcavity, the quantum correlation of the two driving fields is with highefficiency transferred to the two magnon modes. Considerable entanglement couldbe achieved under experimentally achievable conditions $g \gg \kappa_a \gg\kappa_m$, where $g$ is the cavity-magnon coupling rate and $\kappa_a$,$\kappa_m$ are the decay rates of the cavity and magnon modes, respectively.The entanglement is in the steady state and robust against temperature,surviving up to hundreds of milliKelvin with experimentally accessible two-modesqueezed source.

Macroscopic entanglement of two magnon modes via quantum correlated microwave fields