Multi-layer programmable metasurfaces can be used to construct diffractive neural networks in which radio waves are directly processed.
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Lin, X. Artificial intelligence built on wireless signals. Nat Electron 5, 69–70 (2022). https://doi.org/10.1038/s41928-022-00724-y
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DOI: https://doi.org/10.1038/s41928-022-00724-y
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