Time, Place:

09:30 ,Zentraler Seminarraum / Central seminar room (library)

Speaker:

Carlo Kleine; Excited atoms & molecules in strong fields

Title:

Intensity Dependencies in Nonlinear Frequency Upconversion and Bright Nonclassical Light

Time, Place:

11:15 ,Central seminar room, library building

Speaker:

Dr. Lukas Bruder; Universität Freiburg

Title:

Pushing nonlinear spectroscopy and coherent control towards highly dilute samples and the extreme ultraviolet spectral domain

We develop nonlinear spectroscopy and coherent control techniques in the gas phase at visible wavelengths and push boundaries towards applications in the extreme ultraviolet (XUV) spectral domain. In the first part of my talk, I will report about high-resolution two-dimensional spectroscopy in the gas phase to study the structure and ultrafast dynamics of molecular nanosystems isolated from environmental perturbations. The nanosystems consist of atomic clusters doped with individual molecules which provide handy systems to explore solute-solvent interactions and effects of nano confinement. In the second part of my talk, I will introduce our methods for coherent manipulation of XUV pulses and discuss applications. We use phase-modulated XUV pulses for Fourier transform spectroscopy and spectral phase shaping to control strong-field processes.

Time, Place:

15:30 ,Hybrid seminar: central seminar room, library building + Zoom: Meeting-ID: 915 1204 2752 Passcode: 758933

Speaker:

Dr. Tim Lellinger, CERN/MPIK

Title:

First laser-spectroscopy measurements across N = 32 in the calcium isotopic chain at the COLLAPS setup at ISOLDE/CERN

PLEASE NOTE THE UNUSUAL TIME!

Time, Place:

11:15 ,Grosser Hoersaal/Big Lecture Hall (library)

Speaker:

Dr. David Lucas, University of Oxford, Department of Physics

Title:

Quantum networking and computing with trapped ions

Time, Place:

09:30 ,Central Seminar Room, library building

Speaker:

Jan-Hendrik Oelmann; Highly charged ion dynamics

Title:

tba

Time, Place:

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

Speaker:

Dr. Laura Dreissen, Vrije Universiteit Amsterdam

Title:

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).