Mercator Fellows Barbara DIETZ Max Planck Institute for the Physics of Complex Systems Dresden, Germany Maxim GELIN Hangzhou Dianzi University School of Science Dietrich LEIBFRIED NIST National Institute of Standards and Technology U.S. Department of Commerce Cristian MANZONI Istituto di Fotonica e Nanotecnologie (IFN)-CNR Departement of Physics Uwe THUMM Kansas State University Department of Physics