A method for the determination of absolute quantum detection efficiency is suggested based on the measurement of photocount statistics of twin beams. The measured histograms of joint signal-idler photocount statistics allow to eliminate an additional noise superimposed on an ideal calibration field composed of only photon pairs. This makes the method superior above other approaches presently used. Twin beams are described using a paired variant of quantum superposition of signal and noise. The transition from quantum to 'classical' description of the state as seen in quasi-distributions of integrated intensities is analyzed.


Seminar, November 13, 2012, 15:00. Seminar Room

Hosted by Prof. Juan P. Torres