Extended Data Fig. 3: Measuring the cyclicity.
From: Indistinguishable telecom band photons from a single Er ion in the solid state
a Decay of the A transition fluorescence count rate from optical pumping after initializing into \(\left|{\uparrow }_{g}\right\rangle \) (blue). The count rate decays as e−n/C revealing a cyclicity of C = 1030(10). The orange trace corresponds to the same readout pulse sequence after initializing into \(\left|{\downarrow }_{g}\right\rangle \). b Intensity autocorrelation g(2)(t1 − t2) of the A transition showing strong suppression of the zero-delay peak with g(2)(0) = 0.018(3).
