Figure 3: The focused two-photon.
From: On-chip steering of entangled photons in nonlinear photonic crystals
(a) Simulation of the coincidence count profile as a function of the propagation distance. (b) Measured single (blue triangles) and coincidence (red dots) counts versus the transverse position of the fibre tip in the focal plane. (c) Simulation of the coincidence count profile around the focusing spot as a function of the propagation distance. (d) Measured coincidence count profile around the focusing spot as a function of the propagation distance z. Coincidence counts at each distance have been normalized respectively. (e–g) Measured transverse correlation at distances of 29, 33 and 37 mm, respectively. The solid red curves in e–g are Gaussian fittings.
