Bonn 2025 – wissenschaftliches Programm

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Q: Fachverband Quantenoptik und Photonik

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

Q 27.4: Poster

Dienstag, 11. März 2025, 14:00–16:00, Tent

Stabilizing and controlling linear spin quantum systems based on trapped ions — •Andreas Weber, Florian Hasse, Frederike Doerr, Ulrich Warring, and Tobias Schaetz — Institute of Physics, University of Freiburg, Hermann-Herder-Straße 3, D-79104 Freiburg, Germany

The stability and control of quantum systems are fundamental to quantum simulation, as they enable accurate and reproducible modeling of complex quantum phenomena. This work focuses on the stability and control of both the electronic and motional degree of freedom of single trapped magnesium ions. The ions are stored in a linear Paul trap and laser cooled to Microkelvin temperatures. The hyperfine splitting of the electronic ground state allows to span and control a dedicated two-level spin system that can be addressed by microwave fields and initialized by optical pumping techniques. Further control is realized by coupling the motional states of the ion in the trapping potential with the spin states by so-called sideband transitions, allowing to cool the system even further close to absolute ground state of motion. Stabilized electronics make the fields in the vicinity of the trap stable enough to maintain the two-level systems phase information and suppress coupling with the environment. As part of my project, this is implemented using home-built feedback circuits. We expect coherence on millisecond timescales and preparation fidelities above 99%. Stability measurements based on Ramsey spectroscopy not only serve to benchmark our electronics but also show the high precision and sensitivity in detecting systematic changes of physical quantities.

Keywords: Ultra cold atoms; Ramsey interferometry; Quantum simulation; Precision electronics; Quantum sensing