Mainz 2026 – scientific programme
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Q: Fachverband Quantenoptik und Photonik
Q 76: Ultra-cold Atoms, Ions and BEC V (joint session A/Q)
Q 76.4: Talk
Friday, March 6, 2026, 12:00–12:15, N 1
Localized to Delocalized: Radial Eigenmodes in a Tapered Ion Trap — •Moritz Göb1, Manika Bhardwaj1, Bogomila Nikolova2, Bernd Bauerhenne1, Peter Ivanov2, and Kilian Singer1 — 1Experimentalphysik 1, Universität Kasssel — 2Center for Quantum Technologies, Department of Physics, St. Kliment Ohridski University of Sofia
The tapered ion trap, originally proposed for the single ion heat engine [1], exhibits position-dependent radial confinement [2]. Investigating the motional resonances of two- or three-ion crystals in this trap reveals distinct eigenmode characteristics differing from those in linear ion traps.
At weak axial confinement, the inter-ion coupling is minimal, resulting in localized modes where each ion oscillates at a distinct frequency. In contrast, stronger axial confinement leads to the emergence of delocalized eigenmodes, akin to those observed in linear ion traps.
This presentation will explore the implications of these findings for quantum optics and quantum information applications, highlighting the potential benefits of tapered ion traps in these fields.
[1] J. Roßnagel, S.T. Dawkins, K. N. Tolazzi, O. Abah, E. Lutz, F. Schmidt-Kaler, K. Singer, Science 352, 325 (2016).
[2] B. Deng, M. Göb, M. Masuhr, J. Roßnagel, G. Jacob, D. Wang, K. Singer, Quantum Sci. Technol. 10, 015017 (2025).
Keywords: Trapped ions; Tapered ion trap; Eigenmodes; Single ion heat engine; Quantum information