- Bulk-crystal conversion spans about 300 MHz.
What changed
A September 14 Nature Materials paper reports microwave-to-optical conversion in chromium sulfide bromide, a layered antiferromagnet. Microwaves drive a magnetic resonance that changes the material's optical response, producing coherent sidebands. The researchers detected conversion over an approximately 300 MHz window in a bulk crystal without adding an optical cavity.
Why it matters
This supplies another experimental route for connecting systems that operate at microwave frequencies with optical signals. The broad response is relevant because an interface's useful operating range matters alongside its conversion efficiency.
What remains unproven
The reported experiment does not establish a complete quantum network link or prove quantum information survives conversion. Higher coupling through smaller magnetic volumes and cavity integration remains a proposed improvement. The journal publication follows an earlier preprint.
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Recorded source-check date: 15 Sep 2026. A link is not, by itself, evidence that every claim has been independently verified.
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Version 3 · 15 Sep 2026
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