Entangled photons are a key ingredient in optical quantum technologies, but researchers have so far been unable to produce a single pair of entangled photons. Now, two groups from China and Austria independently report just that, with a technique that avoids the need to infer entanglement from detection signatures.
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Kok, P. Entangled photons report for duty. Nature Photon 4, 504–505 (2010). https://doi.org/10.1038/nphoton.2010.180
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DOI: https://doi.org/10.1038/nphoton.2010.180
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