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QD–QD charge stability diagrams (where | n1,n2,n3> indicate the effective charge occupations). Zero-bias conductance is measured across two charge degeneracy points for every pair of QDs. Avoided crossings indicate strong coupling between each pair, while crossings signal that couplings between the dots are equalized 17 . d reports the QD 1 –QD 2 charge stability diagram with QD 3 kept off-resonance

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