Semiconductor quantum dots in cavities are promising single-photon sources. Here, we present a path to deterministic operation, by harnessing the intrinsic linear dipole in a neutral quantum dot via phonon-assisted excitation. This enables emission of fully polarized single photons, with a measured degree of linear polarization up to 0.994 ± 0.007, and high population inversion -- 85\% as high as resonant excitation. We demonstrate a single-photon source with a polarized first lens brightness of 0.50 ± 0.01, a single-photon purity of 0.954 ± 0.001 and single-photon indistinguishability of 0.909 ± 0.004.
@article{arxiv.2007.04330,
title = {Bright Polarized Single-Photon Source Based on a Linear Dipole},
author = {S. E. Thomas and M. Billard and N. Coste and S. C. Wein and Priya and H. Ollivier and O. Krebs and L. Tazaïrt and A. Harouri and A. Lemaitre and I. Sagnes and C. Anton and L. Lanco and N. Somaschi and J. C. Loredo and P. Senellart},
journal= {arXiv preprint arXiv:2007.04330},
year = {2021}
}