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Two of a kind: Photon pair generation, in which input pump photons spontaneously create pairs of photons.
Two of a kind: The process of photon pair generation, in which input pump photons spontaneously generate special pairs of new photons that emerge at precisely the same time, with one at a slightly lower frequency and the other a slightly higher frequency, after which heralding occurs. Credit: Srinivasan, Davanco/NIST.
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