Long description of figure 1

The setup in this photograph shows the minimal amount of optics required to produce quantum-entangled photons in the laboratory. Time-lapse photography and a beam illumination technique make the actual ultraviolet beam visible. The down-converted (red) light exists in single-photon quantities and cannot be seen even by the camera in the second half of the optical setup. Detectors at the end of the optical path collect and count the photons present at the detectors.

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