Fig. 4: A spin-gated optical switch.

a, PSB fluorescence as a function of probe detuning after the emitter has been pumped by a gate pulse into the |0〉 (purple) and |1〉 (orange) states. b, Reflection intensity as a function of detuning. c, Contrast of the resonant reflection dip as a function of saturation parameter, s. The presented reflection contrast is the mean of the contrast of the two transitions.