Kristiaan De Greve, Leo Yu, Peter L. McMahon, Jason S. Pelc, Chandra M. Natarajan, Na-young Kim, Eisuke Abe, Sebastian Maier, Christian Schneider, Martin Kamp, Sven Höfling, Robert H. Hadfield, Alfred Forchel, Martin M. Fejer, Yoshihisa Yamamoto. Quantum-dot spin-photon entanglement via frequency downconversion to telecom wavelength. Nature, 491(7424):421-425, 2012. [doi]