Detector imperfections in photon-pair source characterization
Pavel Sekatski, Nicolas Sangouard, Félix Bussières, C.A. Clausen, Nicolas Gisin, Hugo Zbinden · Journal of Physics B Atomic Molecular and Optical Physics · 2012
We analyse how imperfections in single-photon detectors impact the characterization of photon-pair sources. We perform exact calculations to reveal the effects of multi-pair emissions and of noisy, non-unit efficiency, nonphoton-number resolving detections on the Cauchy–Schwarz parameter, on the second-order auto-correlation and cross-correlation functions, and on the visibilities of both Hong–Ou–Mandel and Bell-like interferences. We consider sources producing either two-mode squeezed states or states with a Poissonian photon distribution. The proposed formulas are useful in practice to determine the impacts of multi-pair emissions and dark counts in standard tests used in quantum optics.