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Hong–Ou–Mandel measurements under resonant s-shell
excitation for the (a) neutral exciton of QD1 
, (b) trion of QD1 
, (c)
neutral exciton of QD2 
, (d)
trion of QD2 
, and (f) trion of QD3 
. The visibilities are calculated by summing
up the peak areas of the three center peaks. The method is explained
in more detail in the Supporting Information; (e) line width of the trion of QD3 with a Gaussian fit 
.
