Figure 4
From: Parametric down-conversion photon-pair source on a nanophotonic chip
Heralded signal-signal correlation function (g2h(τ)) of down-conversion photons. An on-chip pump power of 1.9 mW is used to obtain a sufficiently high counting rate. Here, the heralded anti-bunching dip of g2h(0)= 0.088±0.004 indicates that the photon-pair source is operating in the single-photon regime. Inset shows the schematics of the measurement setup.
