Figure 6

Secret key rate as a function of the elevation angle. The simulation parameters are \(\lambda =663\mbox{ nm}\), a signal intensity of 0.5 mean photons per pulse, a decoy state intensity of 0.1 mean photons per pulse. The transmitter aperture is given by \(D_{T}=9\mbox{ cm}\) and \(D_{R}=60\mbox{ cm}\) respectively. The repetition rated is assumed to be 100 MHz. For simplicity of modelling, the asymptotic rate has been used