Figure 2
From: Modeling the space-time correlation of pulsed twin beams
”Long” pump \(\tau _p= 600\) fs, \(w_p=600 \, \mu\)m. (a–c): Examples of the biphoton correlation (\(\left| \Psi \right|\), multiplied by the volume \(d^2q d\Omega\) of the simulation pixel), numerically calculated by averaging over 3000–10000 stochastic realizations of Eq. (23), showing the increase of the correlation volume with gain. (d) Spectral width (standard deviation) \(\Delta \Omega\) of \(\left| \Psi \right|\) (red) and of \(| G^{(1)}|\) (black) as a function of the gain g. Solid lines: predictions of the QS model, according to Eq. (15). Symbols: results of simulations. (e) Same as (d), but for the width along q.
