Distributing entanglement and single photons through an intra-city, free-space quantum channel

K.J. Resch, M. Lindenthal1, B. Blauensteiner, H.R. Böhm, A. Fedrizzi, C. Kurtsiefer, A. Poppe, T. Schmitt-Manderbach, M. Taraba, R. Ursin, P. Walther, H. Weier2, H. Weinfurter, A. Zeilinger