Magnon-mediated microwave to optical time dynamics

TL;DR

This paper demonstrates real-time microwave to optical signal transfer using optomagnonic modulation in a YIG microsphere, enabling direct observation of magnon dynamics and potential advances in quantum information processing.

Contribution

It introduces a method for real-time analysis of magnonic dynamics via optomagnonic modulation, bridging microwave and optical domains in the temporal scale.

Findings

Real-time transfer of microwave signals to optical domain demonstrated.

Magnon lifetime and dynamics measured directly in the time domain.

Potential applications in magnon-based quantum memory and qubits identified.

Abstract

Optomagnonic modulation techniques are an emerging platform for information transfer from the microwave to the optical domain. However, these techniques focus largely on the spectral domain of the transduced signal. Given the potential of the field to bridge the gap between microwave and optical signals, analyzing and studying the interactions real-time in temporal domain becomes equally essential. In this work, we exploit the optomagnonic modulation in a YIG microsphere to demonstrate and study microwave to optical real-time dynamic transfer on a time scale comparable to the decay of magnons. We inductively excite magnons in the microwave domain and use magnon-based Brillouin light scattering to transduce the signature of excited magnonic waveforms to the optical domain. The square type modulation of the magnons is retrieved in the corresponding optical sidebands. Our work enables real-time measurement of the magnonic dynamics and therefore direct access to lifetime measurements of the magnonic mode. Providing insight into the temporal dynamics of magnons, this work can open up new promising research directions such as in magnon coupled superconducting qubits or magnon-based Brillouin memory.