Quantum technologies

In this work, I report on the imaging and preparation of small atomic ensembles inside our fiber cavity. In Chapter 2, non-destructive techniques for determining the number of atoms loaded into the mode of the cavity are presented. Fluorescence images obtained via Raman cooling imaging [35] are analyzed by means of atom position determination and fluorescence integration. Furthermore, a non-invasive and resource-efficient multi-atom loading technique, based on atom accumulation at the orthogonal lattice crossing under continuous transport, is proposed. The method is studied by a classical 1D numerical simulation in Chapter 3, to explore the parameter space and dynamics of this loading technique. In Chapter 4, the implementation of the novel loading technique is explained and measurement results are compared to the numerical findings. Finally, it is compared to two alternative loading methods and their spatial loading distributions are analyzed. The Appendix presents the procedure for the interferometric alignment of the focal points of the four aspheric lenses used to focus the dipole trap beams and to image the trapped atoms.