Integrating magnons for quantum information

Abstract

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 nonreciprocities. 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.

Exciting High‐Frequency Short‐Wavelength Spin Waves using High Harmonics of a Magnonic Cavity Mode

“…[64,65] Such high efficiencies can be particularly useful for hybrid magnonics, the systems that have attracted much interest for their potential applications in quantum sensing, communication, and information. [66] In particular, hybrid designs that combine the spin of nitrogen-vacancy (NV) centers in diamonds with other materials and physical systems have been shown to enhance quantum sensing and information applications. By increasing the local microwave magnetic field by orders of magnitude, surface-limited SWs generated in the cavity of a thin film MC can greatly enhance the interactions between the SW and the NV spin, or the spin-spin coupling mediated by SWs.…”