We propose a general scheme to generate entanglement encoded in the photon-number basis, via a sequential resonant two-photon excitation of a three-level system. We apply it to the specific case of a quantum dot three-level system, which can emit a photon pair through a biexciton-exciton cascade. The state generated in our scheme constitutes a tool for secure communication, as the multipartite correlations present in the produced state may provide an enhanced rate of secret communication with respect to a perfect GHZ state.
@article{arxiv.2304.08896,
title = {Multipartite entanglement encoded in the photon-number basis by sequential excitation of a three-level system},
author = {Alan C. Santos and Christian Schneider and Romain Bachelard and Ana Predojević and Carlos Antón-Solanas},
journal= {arXiv preprint arXiv:2304.08896},
year = {2023}
}