Mainz 2026 – scientific programme

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Q: Fachverband Quantenoptik und Photonik

Q 64: Poster – Ultra-cold atoms, ions and BEC (joint session A/Q)

Q 64.5: Poster

Thursday, March 5, 2026, 17:00–19:00, Philo 1. OG

Stroboscopic Quantum Sensing in Trapped-Ion Systems — •Frederike Doerr, Florian Hasse, Tobias Spanke, Ulrich Warring, and Tobias Schaetz — Institute of Physics, University of Freiburg, Hermann-Herder-Straße 3, D-79104 Freiburg, Germany

Trapped ions offer exceptional control over quantum motion, enabling precision studies of dynamical and topological phenomena. We present a stroboscopic measurement technique that provides minimally invasive, time-resolved access to an ion’s motional state by maintaining coherence among four coupled oscillators: a global microwave reference, a polarization-gradient travelling-wave light field, and the ion’s spin and motional states. The method reaches position and momentum sensitivities at the nanometer and zeptonewton-microsecond scale with sub-100 ns time resolution [1], and recent improvements extend its applicability to non-classical motional states. These capabilities open new opportunities for engineered quantum dynamics, including motional N00N states, spin-motion entanglement transfer, and tests of topological amplification effects in parametrically driven, dissipative ion systems [2]. Moreover, resolving extremely small momentum transfers enables probing the weak energy exchange in atom-ion glancing collisions, essential for validating universal quantum-scattering models underpinning quantum-based pressure standards [3]. This framework thus links coherent motional sensing, topological quantum effects, and single-collision physics within a unified trapped-ion platform. [1] RPA 109, 053105 (2024) [2] arXiv:2502.06960 [3] 2020 Metrologia 57 025015

Keywords: ramsey interferometry; quantum pressure standards; superresolution of ion dynamics