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VOLUME 33 (1981) | ISSUE 10 | PAGE 493
Absolute calibration of the sensitivity of photodetectors using a biphotonic field
The combined influence of a monochromatic flux of pumping photons and quantum noise on a medium that is not centrally symmetrical results in the appearance of rigorously time-correlated pairs of photons in the spontaneous parametric scattering (SPS) process. The presence of a field of such photon pairs (biphotons) makes it possible to develop a fundamentally new method of determining the absolute quantum efficiency of photodetectors. 1-3