Detection statistics of ultrafast twin-photon pulses

Abstract

We present the counting distributions and correlations of twin-photon beams generated from spontaneous down-conversion or any other twin-photon generating technique. We look at the detection statistics with ultrafast laser light of varying pulse widths and detector quantum efficiencies. We find that the correlation increases in height and falls sharply as we use shorter pulses due to the higher peak power and more stringent requirements for coincidences to occur. We also observe that the counting statistics of the detected twin-photon beams is modified due to varying quantum efficiency and the relative width of the pulse to the detector dead time. The simulation is also extended to include the finite spectral response of the detector.