Fig. 5. Measurement of quantum spin-photon correlations.

a Schematic of the pulse sequence used for the correlation measurements in superposition bases. b, c Time-resolved coincidence events when the spin state was projected onto $∣\uparrow ⟩+i∣\downarrow ⟩$ and $∣\uparrow ⟩-i∣\downarrow ⟩$, respectively, recorded at a magnetic field of 9 T. d, e identical measurements to b, c, recorded at a magnetic field of 5 T. Black lines correspond to fits of the original data which are marked by squares with error bars given by poissonian statistics, and coloured lines are after deconvolving with the detectors' jitter.