Zeit, Ort:

09:30 Uhr, Central Seminar Room, library building

Redner:

Jan-Hendrik Oelmann; Highly charged ion dynamics

Titel:

The Th-229 nuclear clock transition: A benchmark for our XUV frequency comb?

Zeit, Ort:

15:00 Uhr, Zentraler Seminarraum / Central seminar room (library)

Redner:

Dr. Laura Dreissen, Vrije Universiteit Amsterdam

Titel:

Precision quantum metrology in trapped ions for tests of fundamental physics

Abstract:The Standard Model (SM) of particle physics describes fundamental interactions between the known particles extremely well, but it fails to provide answers for big open questions, e.g. the origin and composition of dark matter or the matter anti-matter asymmetry. Hunting for new physics effects with small cross sections, whether through broken symmetries, new feeble interactions or heavy particles at energies beyond our current reach, requires a high sensitivity. In this talk I will elaborate on how precision quantum metrology in trapped cold ions can be used for competitive tests of the SM and search for new physics [1]. In particular, I will show how isotope shift measurements in trapped ions can be used as a sensitive probe for a possible new boson-mediated fifth force that couple electrons and neutrons [2]. Our latest results in Yb+ ions [4] were used to benchmark ab-initio nuclear theory and put competitive bounds on a new long-range boson. To further push this field forward, my research focusses on novel techniques involving quantum state engineering. With entangled states in Ba+ I aim to become more robust against ambient noise and systematic effects, hereby improving the measurement sensitivity. I will apply these techniques to further explore isotope shift spectroscopy, improve optical clock spectroscopy and investigate atomic parity violation. In this talk, I will give a general overview of my line of research and report on the experimental progress.[1] M. Safronova et al., Rev. Mod. Phys. 90, 025008 (2018)[2] J. C. Berengut et al., 413 Phys. Rev. Lett. 120, 091801 (2018)[3] M. Door et al., Phys. Rev. Lett 134, 063002 (2025).