Author Affiliations +
Witlef Wieczorek,1,2 Roland Krischek,1,2 Akira Ozawa,1 Géza Tóth,3,4,5 Nikolai Kiesel,1,2 Patrick Michelberger,1,2 Thomas Udem,1 Harald Weinfurter1,2
1Max-Planck-Institut für Quantenoptik (Germany)
2Ludwig-Maximilians-Univ. München (Germany)
3Univ. del País Vasco (Spain)
4IKERBASQUE, Basque Foundation for Science (Spain)
5Research Institute for Solid State Physics and Optics (Hungary)