Reaching the Bose-Einstein Condensation of Dipolar Molecules

The groundbreaking research reported in this thesis details the journey that led to the creation of the first Bose-Einstein condensate (BEC) of dipolar molecules, a long-standing goal in the field of ultracold quantum science for over two decades. This unique document charts the path through the significant technical, experimental, and theoretical challenges that had to be overcome to go from an empty lab to the realization of the first molecular BEC. Central to this achievement was the development of a novel collisional shielding technique, double microwave shielding, which by suppressing inelastic collisional losses by several orders of magnitude enabled the first evaporative cooling of a molecular gas to nanokelvin temperatures. This breakthrough opens new avenues for the exploration of many-body quantum systems with long-range interactions. This work has already garnered widespread attention, inspiring new research in molecular quantum liquids, quantum simulation, and quantum computing with ultracold molecules. This thesis provides a comprehensive and accessible account of the theoretical foundations, technical innovations, experimental results, and future implications of this remarkable accomplishment.