Single-photon emission is a well-explored process. But in recent years interest in two-photon emission has grown. Nature Photonics spoke to Meir Orenstein and Alex Hayat in Israel about their latest work, which reports two-photon emission in a semiconductor.
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Jenkins, A. Two photons are better than one. Nature Photon 2, 256 (2008). https://doi.org/10.1038/nphoton.2008.50
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DOI: https://doi.org/10.1038/nphoton.2008.50