Fig. 1. (Color online) The epi-structure of the sample.

Fig. 2. (Color online) (a) Inscribing a stripe with a narrow ditch on the substrate along the gradient indium flux direction. (b) Dividing the stripe into four small parts (A, B, C, D). (c) Illustrations of selected areas for etching.

Fig. 3. Schematic diagrams of (a) fiber coupling, (b) fiber array, (c) cross-section of optical fiber array. (d) SEM image of micropillar array.

Fig. 4. (Color online) (a) Auxiliary coupling device. (b) The coupled fiber array is fixed onto the metal holder.

Fig. 5. (a) Single photon coupled by the SM fiber at preliminary testing. (b) Multiple photons, coupled by one fiber.

Fig. 6. (Color online) (a) Cavity modes are mismatched at 27.4 K (with p200 attenuation), using the Lorentz function fit for the PL spectrum. (b) Cavity modes matched at 33.6 K (with p200 attenuation), fitting the PL spectrum.

Fig. 7. (Color online) (a) Three-dimensional PL spectrum with variable temperature from 27.4 to 40.4 K.

Fig. 8. Intensity of single QD excitation (X) as the excitation power changes, where I ∝ , and the intensity of CM (I ∝ ).

Fig. 9. (a) Spectrum when the sample temperature is 32.4 K (with p₀ attenuation). (b) Spectrum when the sample temperature is 33.6 K (with p₀ attenuation). (c) The second-order correlation function of deconvolved data in the case of fitting cavity-mode mismatching (T = 32.4 K). (d) The second-order correlation function of deconvolved data in the case of fitting cavity-mode matching (T = 33.6 K).