  We show how to generate stationary entanglement between light and microwave
in a hybrid opto-electro-magnonical system which mainly consists of a microwave
cavity, a yttrium iron garnet (YIG) sphere and a nanofiber. The optical modes
in nanofiber can evanescently coupled to whispering gallery modes, that are
able to interact with magnon mode via spin-orbit interaction, in YIG sphere,
while the microwave cavity photons and magnons are coupled through magnetic
dipole interaction simultaneously. Under reasonable parameter regimes, pretty
amount of entanglement can be generated, and it also shows persistence against
temperature. Our work is expected to provide a new perspective for building
more advanced and comprehensive quantum networks along with magnons for
fast-developing quantum technology and for studying the macroscopic quantum
phenomena.
