Fig. 3: Signal-to-background ratio and coincidence rate of the photon pair source.
From: Telecom quantum photonic interface for a 40Ca+ single-ion quantum memory
The SBR and the coincidence rate are plotted in dependence of the coincidence time window Δt, for a pump power of 20 mW. The error bars are calculated from the Poissonian noise of the measured coincidences. The dashed lines show the theoretical calculations according to Eq. (4) for the SBR and Eq. (2) for the coincidence rate, with \({R}_{{{{\rm{pair}}}}}=4.7\cdot 1{0}^{4}\frac{{\rm{pairs}}}{{\rm{s}}\,{\rm{mW}}}\) the only fit parameter for both curves.
