Tailored quantum dots for entangled photon pair creation

A Greilich, M Schwab, T Berstermann, T Auer, R Oulton, D R Yakovlev, M Bayer, V Stavarache, D Reuter, A Wieck

Research output: Contribution to journalArticle (Academic Journal)peer-review

51 Citations (Scopus)


We compare the asymmetry-induced exchange splitting delta(1) of the bright-exciton ground-state doublet in self-assembled (In,Ga)As/GaAs quantum dots, determined by Faraday rotation, with its homogeneous linewidth gamma, 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 delta(1) and gamma become comparable, whereupon the carriers are still well confined. This opens the possibility to observe polarization entangled photon pairs through the biexciton decay cascade.

Original languageEnglish
Article number045323
Pages (from-to)-
Number of pages4
JournalPhysical Review B: Condensed Matter and Materials Physics
Issue number4
Publication statusPublished - Jan 2006

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