Tailored quantum dots for entangled photon pair creation

Details Tailored quantum dots for entangled photon pair creation Tailored quantum dots for entangled photon pair creation

2006-01-16

arxiv.org/abs/physics/0601107v1

Physics

Optics

4 pages, 4 figures

Scientific paper

10.1103/PhysRevB.73.045323

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. Post-growth 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.

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