Authors: C Smorra; S Sellner; M J Borchert; J A Harrington; T Higuchi; H Nagahama; T Tanaka; A Mooser; G Schneider; M Bohman; K Blaum; Y Matsuda; C Ospelkaus; W Quint; J Walz; Y Yamazaki; S Ulmer Journal: Nature Date: 2017-10-18 Impact factor: 49.962