The quest to combine and interact quantum systems over a wide frequency range poses a significant challenge to hybrid photonic-matter systems. This challenge affects both distributed quantum computation and communication. But hope is on the horizon, as magnonics provides an answer for coupling photonic quantum systems.

Magnonics can realise such a coupling to photonic quantum systems. Photonics typically operates in the terahertz (THz) frequency regime. Its fundamental particles, photons, are widely used as quanta for quantum computation and simulation, quantum machine learning, and quantum sensing, most prominently in quantum communication applications for the quantum internet across Europe. In contrast, magnonics typically operates in the gigahertz (GHz) to the terahertz (THz) regime, with its quasi-particles magnons (collective of spin-wave excitations).

Emerging as a novel field, quantum magnonics aims to combine quantum systems coherently across a wide frequency range in the form of quantum transducers/converters. This unique ability makes magnonics an indispensable platform for quantum technology.

The Hybrid Opto-Magnonic Quantum Systems (HOMaQS) project is at the forefront of this ground-breaking field. It aims to couple optical photons to single propagating magnons, providing a crucial step towards the development of the quantum internet. Join us in this exciting journey towards a quantum future.