  Magnons, the quanta of collective spin excitations in magnetically ordered
materials, have distinct properties that make them uniquely appealing for
quantum information applications. They can have ultra-small wavelengths down to
the nanometer scale even at microwave frequencies. They can provide coupling to
a diverse set of other quantum excitations, and their inherently gyrotropic
dynamics forms the basis for pronounced non-reciprocities. In this article we
discuss what the current research challenges are for integrating magnetic
materials into quantum information systems and provide a perspective on how to
address them.
