A programmable quantum chip has been developed that generates, manipulates, and launches five-dimensional entangled photons into free-space channels, encoded as optical vortex modes, thus bridging the worlds of integrated and free-space quantum photonics.
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Cardano, F., Marrucci, L. Twisting entangled photons on a chip. Nat. Photon. 19, 447–449 (2025). https://doi.org/10.1038/s41566-025-01648-7
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DOI: https://doi.org/10.1038/s41566-025-01648-7