Array of entangled-light-emitting diodes with site-controlled pyramidal quantum dots

In this report, we demonstrate for the first time, a platform to generate polarization-entangled photons, based on highly symmetric pyramidal quantum dots, achieving both site-controlled and electrically-injected capabilities at the same time. Combining with time gating techniques, our triggered light sources were proven for the first time to violate Bell's inequalities, an even more stringent examination for applications to future quantum information technologies.