Abstract
Single photon detectors nowadays are widely used in numerous applications such as quantum cryptography, laser ranging, single molecule spectroscopy and so on. And the calibration of the detection efficiency is quite important for some of the applications. In recent years, researchers find that correlated photon pairs can be employed to calibrate the detection efficiency of single-photon detectors with quite high precision. Firstly, we calibrated the InGaAs single photon detector quantum efficiency at 1550nm by correlated photon pairs. Consistency between the measurement result using correlated photon pairs and the reference value is better than 0.8%. Secondly, the detectors are calibrated with an attenuated laser source. Thirdly, the two methods for measuring the quantum efficiency of single photon detectors, correlated photon pairs and laser attenuation, respectively, are discussed and analyzed in detail. Finally, results derived from the two methods have been compared with each other.
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