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We experimentally observe the effect of photo-generated carriers on thespectral diffusion of a quantum dot (QD) coupled to a photonic crystal (PC)cavity. In this system, spectral diffusion arises in part from chargefluctuations on the etched surfaces of the PC. We find that these fluctuationsmay be suppressed by photo-generated carriers, leading to a reduction of themeasured QD linewidth by a factor of ~2 compared to the case where thephoto-generated carriers are not present. This result demonstrates a possiblemeans of countering the effects of spectral diffusion in QD-PC cavity systemsand thus may be useful for quantum information applications where narrow QDlinewidths are desired.

The effect of photo-generated carriers on the spectral diffusion of a quantum dot coupled to a photonic crystal cavity