We introduce a scalable photonic platform that enables efficient generation of entangled photon pairs from a semiconductor quantum dot. Our system, which is based on a self-aligned quantum dot-micro-cavity structure, erases the need for complex steps of lithography and nanofabrication. We experimentally show collection efficiency of 0.17 combined with a Purcell enhancement of up to 1.7 in the pair emission process. We harness the potential of our device to generate photon pairs entangled in time bin, reaching a fidelity of 0.84(5) with the maximally entangled state. The achieved pair collection efficiency is 4 times larger than the state-of-the art. The device, which theoretically supports pair extraction efficiencies of nearly 0.5 is a promising candidate for the implementation of bright sources of time-bin, polarization- and hyper entangled photon pairs in a straightforward manner.
@article{arxiv.2010.01555,
title = {Entangled photon pairs from quantum dots embedded in a self-aligned cavity},
author = {Laia Ginés and Carlo Pepe and Junior Gonzales and Niels Gregersen and Sven Höfling and Christian Schneider and Ana Predojević},
journal= {arXiv preprint arXiv:2010.01555},
year = {2021}
}