Microwave-to-optical transduction using magnon-exciton coupling in a layered antiferromagnet

• URL: http://arxiv.org/abs/2604.03441v1
• Date: Fri, 03 Apr 2026 20:33:22 GMT
• Title: Microwave-to-optical transduction using magnon-exciton coupling in a layered antiferromagnet
• Abstract summary: We show coherent microwave-to-optical based on magnon-exciton coupling in layered antiferromagnet CrSBr.<n>Our results establish magnon-coupled excitons in layered magnets as a scalable platform for broadband microwave-optical interfaces.
• Score: 1.2698409732765652
• License: http://creativecommons.org/licenses/by/4.0/
• Abstract: Coherent interfaces between microwave-frequency quantum systems and low-loss optical links are essential for quantum networks. However, existing microwave-optical transducers often trade conversion efficiency against added noise, bandwidth, and device integrability. Here, we demonstrate coherent microwave-to-optical transduction based on magnon-exciton coupling in the layered antiferromagnet CrSBr. Driving the antiferromagnetic resonance with microwave signals imprints coherent modulation on a reflected optical probe, generating optical sidebands that are resonantly enhanced near excitonic transitions. While prior magnon-based approaches to microwave-to-optical transduction have typically relied on intrinsically weak off-resonant magneto-optical effects (e.g., Faraday rotation), our scheme exploits strong light-matter interactions at exciton resonances. Even in a bulk crystal without cavity enhancement, we observe coherent conversion over an intrinsically broadband window of ~ 300 MHz. We further show that multiple exciton-polariton resonances inherit the magnon-coupled response, suggesting a route to broaden the usable optical detuning range and to mitigate optical dissipation. Our results establish magnon-coupled excitons in layered magnets as a scalable platform for broadband microwave-optical interfaces, with pathways to higher cooperativity via reduced magnetic volume and cavity integration.

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