One Photon In, TWO Photons Out

Описание к видео One Photon In, TWO Photons Out

A fascinating phenomenon with a forbidding name (parametric down conversion) occurs in certain crystals. A single photon enters, but two emerge. There are myriad pair combinations; but in each case, the sum of the total energy and momentum of the two output photons exactly equals those of the single input photon.

Parametric down conversion is finding a host of uses in physics, from testing the efficiency of high-tech single-photon detectors to cutting-edge experiments in quantum mechanics.

Alan Migdall of the National Institute of Standards and Technology explains and demonstrates how it's done.

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