Optimal collection of radiation emitted by a trapped atomic ensemble Árpád Kurkó, Peter Domokos, András Vukics, Thomas Bækkegaard, Nikolaj Thomas Zinner, József Fortágh and David Petrosyan EPJ Quantum Technol., 8 1 (2021) 11 Published online: 13 May 2021 DOI: 10.1140/epjqt/s40507-021-00102-1