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A method for the determination of absolute quantum detection efficiency issuggested based on the measurement of photocount statistics of twin beams. Themeasured histograms of joint signal-idler photocount statistics allow toeliminate an additional noise superimposed on an ideal calibration fieldcomposed of only photon pairs. This makes the method superior above otherapproaches presently used. Twin beams are described using a paired variant ofquantum superposition of signal and noise.

Absolute detector calibration using twin beams