Figure 3: Photon correlation measurements.

(a) Raw data (black)of the second-order correlation function g⁽²⁾(τ), fit with equation (1) (red). The g⁽²⁾(τ) is normalized to 1 at infinite delay times. P_sat is the saturation power ∼20 nW. T₁=1.85±0.02 ns and T₂=1.62 ns are used, while Ω is fitted. (b) The Rabi frequency as extracted from the fitting is plotted as a function of the square root of the excitation laser power. The values follow a linear trend, indicated by the red line.