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Q: Fachverband Quantenoptik und Photonik
Q 41: Poster – Quantum Technologies II & Laser Technology
Q 41.13: Poster
Mittwoch, 4. März 2026, 17:00–19:00, Philo 2. OG
Towards time-reversing an exponentially rising pulse with a single ground state cooled 174Yb+ ion — •Sebastian Luff1,2, Hans Dang1,2, Martin Fischer1, Markus Sondermann1,2, and Gerd Leuchs1,2 — 1Max Planck Institute for the Science of Light, Erlangen, Germany — 2Friedrich-Alexander-Universität Erlangen-Nürnberg, Erlangen, Germany
Deterministic excitation of a single ion by a single photon can be realized when the temporal envelope of the photon matches the time-reversed waveform of a spontaneously emitted photon from the same atomic transition [1]. In this work, we implement such a scheme by sending an exponentially rising pulse onto a 174Yb+ ion, driving its strong dipole transition (370 nm wavelength, 8.1 ns life time). To enhance the photon-ion coupling efficiency, the ion is positioned inside a deep parabolic mirror that covers nearly the full solid angle of the incident light field [2]. This geometry enables near-maximal spatial mode overlap between an incident doughnut-shaped mode and the ion’s dipole radiation pattern. Furthermore, the ion is cooled well below the Doppler limit through resolved sideband cooling, reducing its spatial extent to a size smaller than the focal spot of the parabolic mirror. We report on our progress towards achieving the maximum coupling possible with this system.
1. Leuchs, G. & Sondermann, M. Phys. Scr. 85, 058101 (2012).
2. Maiwald, R. et al., Phys. Rev. A 86, 043431 (2012).
Keywords: Ion trapping; Efficient light matter interaction; Resolved sideband cooling; Exponentially rising pulse; Excitation single ion