Quantum efficiency measurement of single-photon detectors using photon pairs generated in optical fibers

摘要

Using the correlated signal and idler photon pairs generated in a dispersion-shifted fiber by a pulsed pump, wenmeasure the quantum efficiency of an InGaAs/InP avalanche photodiode-based single-photon detector. Sincenthe collection efficiency of photon pairs is a key parameter to correctly deduce the quantum efficiency, we carefullyncharacterize the collection efficiency by studying the correlation dependence of photon pairs on the spectranof pump, signal, and idler photons. This study allows us to obtain the quantum efficiency of the singlephotonndetector by using photon pairs with various kinds of bandwidth. © 2010 Optical Society of America