Bonn 2025 – wissenschaftliches Programm

Bereiche | Tage | Auswahl | Suche | Aktualisierungen | Downloads | Hilfe

Q: Fachverband Quantenoptik und Photonik

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

Q 27.19: Poster

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

Long-lived and trapped Circular Rydberg states of alkaline-earth atoms at room temperature — •Einius Pultinevicius, Aaron Götzelmann, Armin Humic, Moritz Berngruber, Christian Hölzl, and Florian Meinert — 5. Physikalisches Institut, Universität Stuttgart

Highly excited Rydberg atoms have become prominent in the field of quantum simulation and computation. While these excitations result in favourable long-range dipolar interactions for the implementation of many-body spin models, usual excitations at low orbital momentum, however, come with fundamental restrictions such as lifetime limited coherence times and challenging trapping requirements.

To overcome these caveats, we are working towards a quantum sim- ulator based on circular Rydberg states (CRS) of neutral ⁸⁸Sr atoms. At maximum orbital momentum, these states feature only a handful of decay channels which can be suppressed using a resonator made from indium tin oxide (ITO) coated glass plates. This allows the enhancement of the black-body radiation limited lifetime to the milli-second range without use of cryogenics. We explore this effect in our field control structure, and to this end probe CRS at principle quantum numbers up to 90 via coherent microwave-control. Measurements at such timescales further require trapping, which is enabled by the second valence electron of strontium for Gaussian tweezers. The low overlap of the ionic core with the circular wavefunction further allows autoionization-free excitations, which is demonstrated by probing state-dependent interactions with the Rydberg electron.

Keywords: Circular Rydberg States; Alkaline-Earth; Tweezer; Quantum Simulation