用于纠缠光子对产生的定制量子点
Tailored quantum dots for entangled photon pair creation
摘要：
我们比较了自组装（In，Ga）As/GaAs量子点中由法拉第旋转确定的亮激子基态对的不对称诱导的交换分裂delta_1与由时间分辨光致发光中的辐射衰减获得的均匀线宽γ。生长后的点结构的热退火导致相当大的均匀线宽的增加，而同时观察到的交换分裂的强烈减少。退火可以被定制，使得δ_1和γ变得相当，因此载流子仍然被很好地限制。这为通过双激子衰变级联观察偏振纠缠光子对提供了可能性。
英文摘要：
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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