%0 Journal Article %T Absolute efficiency estimation of photon-number-resolving detectors using twin beams %A A. P. Worsley %A H. B. Coldenstrodt-Ronge %A J. S. Lundeen %A P. J. Mosley %A B. J. Smith %A G. Puentes %A N. Thomas-Peter %A I. A. Walmsley %J Physics %D 2009 %I arXiv %R 10.1364/OE.17.004397 %X A nonclassical light source is used to demonstrate experimentally the absolute efficiency calibration of a photon-number-resolving detector. The photon-pair detector calibration method developed by Klyshko for single-photon detectors is generalized to take advantage of the higher dynamic range and additional information provided by photon-number-resolving detectors. This enables the use of brighter twin-beam sources including amplified pulse pumped sources, which increases the relevant signal and provides measurement redundancy, making the calibration more robust. %U http://arxiv.org/abs/0906.2182v1