High-precision magnetometers are key components in the apparatus used to search for the neutron electric dipole moment (n2EDM) at PSI’s ultracold neutron facility. For this reason, the ultracold neutron physics group has long operated a dedicated high-precision magnetometry laboratory. This long-standing commitment led to the group hosting this year’s edition of the Workshop on Optically-Pumped Magnetometers (WOPM2025).
Held from August 6 to 8, the event began with a full day of Summer School lectures, followed by scientific sessions attended by 145 researchers from institutions worldwide. Participants discussed the latest advances and challenges in high-precision magnetometry, with particular focus on sensors based on spin-polarized atomic vapors such as cesium, rubidium, and helium. These technologies, while central to precision fundamental physics experiments, are also finding growing applications in medical diagnostics and are approaching readiness for industrial deployment.
Hosting WOPM2025 at PSI reflects the institute’s active engagement in the development of optically pumped magnetometers and its strong connections within the global atomic magnetometry community.