We report the experimental realization of heralded distribution of single-photon path entanglement at telecommunication wavelengths in a repeater-like architecture. The entanglement is established upon detection of a single photon, originating from one of two spontaneous parametric down conversion photon pair sources, after erasing the photon's which-path information. In order to certify the entanglement, we use an entanglement witness which does not rely on post-selection. We herald entanglement between two locations, separated by a total distance of 2 km of optical fiber, at a rate of 1.6 kHz. This work paves the way towards high-rate and practical quantum repeater architectures.
@article{arxiv.2004.09465,
title = {Heralded distribution of single-photon path entanglement},
author = {Patrik Caspar and Ephanielle Verbanis and Enky Oudot and Nicolas Maring and Farid Samara and Misael Caloz and Matthieu Perrenoud and Pavel Sekatski and Anthony Martin and Nicolas Sangouard and Hugo Zbinden and Rob Thew},
journal= {arXiv preprint arXiv:2004.09465},
year = {2020}
}