1. Max Planck Institute of Quantum Optics, 85748 Garching, Germany
2. LIBPhys, Physics Department, Universidade de Coimbra, 3004-516 Coimbra, Portugal
3. Laboratório de Instrumentação, Engenharia Biomédica e Física da Radiação (LIBPhys-UNL) e Departamento de Física da Faculdade de Ciências e Tecnologia da Universidade Nova de Lisboa, Monte da Caparica, 2892-516 Caparica, Portugal
4. Laboratoire Kastler Brossel, UPMC-Sorbonne Universités, CNRS, ENS-PSL Research University, Collège de France, 4 place Jussieu, case 74, 75005 Paris, France
5. Institut für Strahlwerkzeuge, Universität Stuttgart, 70569 Stuttgart, Germany
6. Institute for Particle Physics, ETH Zurich, 8093 Zurich, Switzerland
7. Paul Scherrer Institute, 5232 Villigen-PSI, Switzerland
8. Physics Department, National Tsing Hua University, Hsinchu 300, Taiwan
9. i3N, Universidade de Aveiro, Campus de Santiago, 3810-193 Aveiro, Portugal