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Copper-free chips generate robust ‘combs’ of multicoloured light

Henry James
By Henry James

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Nature, Published online: 22 October 2025; doi:10.1038/d41586-025-03130-4

A stable ‘frequency comb’ of photons with discrete colours has been generated on a microscale chip by removing copper contaminants from the circuit.



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Henry James
Henry James

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