1. NVision Imaging Technologies GmbH, 89081 Ulm, Germany
2. Paul Scherrer Institute, 5232 Villigen PSI, Switzerland
3. Institute for Quantum Optics, Ulm University, 89081 Ulm, Germany
4. Racah Institute of Physics, The Hebrew University of Jerusalem, Jerusalem 91904, Givat Ram, Israel
5. Institute for Theoretical Physics, Ulm University, 89081 Ulm, Germany
6. Center for Integrated Quantum Science and Technology, Ulm University, 89081 Ulm, Germany
7. Institut des Sciences et Ingénierie Chimiques, École Polytechnique Fédérale de Lausanne, CH-1015 Lausanne, Switzerland