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We compare the asymmetry-induced exchange splitting δ₁ of the bright-exciton ground-state doublet in self-assembled (In,Ga)As∕GaAs quantum dots, determined by Faraday rotation, with its homogeneous linewidth γ, obtained from the radiative decay in time-resolved photoluminescence. Postgrowth thermal annealing of the dot structures leads to a considerable increase of the homogeneous linewidth, while a strong reduction of the exchange splitting is simultaneously observed. The annealing can be tailored such that δ₁ and γ become comparable, whereupon the carriers are still well confined. This opens the possibility to observe polarization entangled photon pairs through the biexciton decay cascade.
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Greilich et al. (2006) studied this question.
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