The generation rate of entangled photons emitted from cascaded few-level systems is intrinsically limited by the lifetime of the radiative transitions. Here, we overcome this limit for entangled photon pairs from quantum dots via a novel driving regime based on an active reset of the radiative cascade. We show theoretically and experimentally the driving regime to enable the generation of entangled photon pairs with higher fidelity and intensity compared to the optimum continuously driven equilibrium state. Finally, we electrically generate entangled photon pairs with a total fidelity of (79.5±1.1)% at a record clock rate of 1.15GHz.
@article{arxiv.2001.06251,
title = {Active reset of a radiative cascade for superequilibrium entangled photon generation},
author = {Jonathan R. A. Müller and R. Mark Stevenson and Joanna Skiba-Szymanska and Ginny Shooter and Jan Huwer and Ian Farrer and David A. Ritchie and Andrew J. Shields},
journal= {arXiv preprint arXiv:2001.06251},
year = {2020}
}