Figure 3: Distribution of detector output voltages.
From: Practical photon number detection with electric field-modulated silicon avalanche photodiodes
(a) Distribution of the output voltage pulses from an electric field-modulated Si-APD, measured for a detected photon flux μ′=4.8 photons per pulse. (b) Output voltage distribution (symbols) measured for a detected photon flux μ′=0.92 photons per pulse, for which there are only contributions from 0, 1 and 2 detected photons. The dashed lines correspond to discrimination levels used to determine the photon number error between adjacent photon number states, which are modelled using Gaussian fits (red curves).
