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Ultrafast electrically-triggered sources of single photons and entangled-photon pairs based on strain-tunable quantum dots LEDs

Self-assembled quantum dots (QDs) have emerged as attractive quantum systems for the generation of single and entangled photons for quantum information processing [1]. However, owing to the mesoscopic shape, strain and composition anisotropy, self-assembled QDs are subject to an inhomogeneous broadening and an energetic separation between two bright exciton states known as fine-structure-splitting (FSS). These hurdles hamper not only the realization of indistinguishable single photons from different QDs sources, but also the generation of entangled-photon pairs from the biexciton cascade of QDs.