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Solid-state quantum emitters often suffer from temporal variations of their transition energies, inherited from fluctuations in the host crystal environment. This spectral diffusion (SD) is detrimental to the emitter linewidth but is often challenging to characterize experimentally. The authors show here that, under resonant laser excitation, the statistics of the scattered photons offer multiple signatures of the SD process, making it possible to discriminate between discrete jumps and continuous diffusion, as well as to access relevant parameters of the SD mechanisms.
Delteil et al. (2024) studied this question.