Bonn 2025 – scientific programme

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Q: Fachverband Quantenoptik und Photonik

Q 27: Poster – Ultra-cold Atoms, Ions and BEC (joint session A/Q)

Q 27.2: Poster

Tuesday, March 11, 2025, 14:00–16:00, Tent

Advanced Interferometer Techniques for Measuring Near-Resonant Light Shifts and Superresolving Trapped-Ion Dynamics — •Frederike Doerr, Florian Hasse, Ulrich Warring, and Tobias Schaetz — Institute of Physics, University of Freiburg, Hermann-Herder-Straße 3, D-79104 Freiburg, Germany

This work introduces two innovations in Ramsey interferometry with trapped ions, advancing precision in quantum metrology. First, we implement a Mach-Zehnder-inspired technique to detect near-resonant AC Zeeman shifts, enabling precise measurement of weak fields and enhanced ion-state manipulation. Second, we enhance temporal resolution via improvements in an acousto-optic modulator (AOM) setup, enabling the tracking of rapid ion dynamics and real-time phase encoding at sub-wavelength scales [1]. This is particularly beneficial for experiments requiring squeezed states and exact phase control. These advancements enhance Ramsey interferometry's capability to probe complex quantum systems, with broad applications in quantum simulation, sensing, and control technologies.

[1] Florian Hasse et al., Phys. Rev. A 109, 053105 (2024)

Keywords: Ramsey interferometry; near-resonant AC Zeeman shift; superresolution of ion dynamics