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 us 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.
© 2012 Optical Society of America
Original Manuscript: February 20, 2012
Revised Manuscript: April 17, 2012
Manuscript Accepted: April 22, 2012
Published: June 19, 2012
Jan Peřina, Ondřej Haderka, Václav Michálek, and Martin Hamar, "Absolute detector calibration using twin beams," Opt. Lett. 37, 2475-2477 (2012)