Explore precision spectroscopy techniques in many-body ion systems through this conference talk delivered by Tanja Mehlstäubler from PTB. Delve into the latest advancements in quantum metrology and their applications in fundamental physics research, including dark matter searches and gravitational wave detection. Gain insights into the unexpected connections between quantum metrology methods and various fields of physics, from optics and condensed matter to atomic physics and quantum information. Discover how this interdisciplinary approach is fostering new scientific discoveries and collaborations between particle physics experts and quantum technology researchers. Learn about the design and interpretation of fundamental physics studies using quantum technologies, and explore emerging ideas in quantum metrology for future applications.