Fig. 5: Tuning the photon statistics of single NCs with temperature and magnetic field.

a Normalized photon coincidence histograms of a NC for various temperatures, in zero field and at ~100 W cm⁻². The photon bunching obtained at low temperatures turns to antibunching as thermal mixing between bright and dark exciton states operates. b Simulations of the PL autocorrelation function with a four-level model described in Supplementary Note 2, taking Γ_B = 0.9 ns⁻¹, \({\Gamma}_{\mathrm{D}} = 0.01\) ns⁻¹, γ₀ = 0.1 ns⁻¹, α = 3/4, W = 0.01 ns⁻¹, \(\eta _{{\mathrm{XX}}} =\) 0.13, \(E_1 =\) 3 meV, \(E_2 =\) 5.6 meV. c Photon coincidence histograms at various magnetic fields, at 4 K, showing the weakening of the bunching effect with increasing magnetic fields. d Photon coincidence histograms measured for the same NC in different conditions of line filtering, at 4 K and in zero field. Each histogram is surmounted by the corresponding filtering scheme. Left panel: Histogram recorded in a cross-correlation configuration, selecting the exciton ZPLs on one channel of the correlation setup and the biexciton ZPLs on the other. The asymmetry of the histogram is a signature of ordered biexciton–exciton–zero exciton photon cascades. Right panel: Histogram recorded with high-pass filtering of the exciton ZPLs, showing photon antibunching.