A major challenge in developing photonic quantum technology is linking sources of single photons with the integrated circuits that will be used to process data. Physicists in Germany have shown how to do this with cavities made from photonic crystals, which could in future be mass-produced using standard semiconductor manufacturing techniques (Adv. Quant. Technol., doi: 10.1002/qute.201900084). The researchers say the cavity design should be flexible enough for use in a broad range of applications, from computing to sensing.

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