Microwave-to-optical transduction using magnon-exciton coupling.

Coherent microwave-to-optical transduction is realized in the layered antiferromagnet CrSBr over an intrinsically broadband ~300-MHz window using magnon–exciton coupling.

• Why it matters: Quantum networks need low-loss, coherent links between microwave quantum systems and optical channels, but existing transducers often face efficiency–noise and bandwidth–integrability tradeoffs.
• What they did: The antiferromagnetic resonance is driven by microwaves to modulate resonant excitonic susceptibility, producing coherent optical sidebands measured with homodyne interferometry in a bulk crystal.
• The result: Coherent conversion is observed without cavity enhancement, and multiple exciton-polariton resonances carry the magnon-coupled response, suggesting broader optical detuning range and reduced optical dissipation.

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