Coupling individual quantum systems lies at the heart of building scalable quantum networks. Here, we report the first direct photonic coupling between a semiconductor quantum dot and a trapped ion and we demonstrate that single photons generated by a quantum dot controllably change the internal state of an Yb+ ion. We ameliorate the effect of the sixty-fold mismatch of the radiative linewidths with coherent photon generation and a high-finesse fiber-based optical cavity enhancing the coupling between the single photon and the ion. The transfer of information presented here via the classical correlations between the σz-projection of the quantum-dot spin and the internal state of the ion provides a promising step towards quantum state-transfer in a hybrid photonic network.
@article{arxiv.1411.0738,
title = {Direct photonic coupling of a semiconductor quantum dot and a trapped ion},
author = {H. M. Meyer and R. Stockill and M. Steiner and C. Le Gall and C. Matthiesen and E. Clarke and A. Ludwig and J. Reichel and M. Atatüre and M. Köhl},
journal= {arXiv preprint arXiv:1411.0738},
year = {2015}
}