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Q: Fachverband Quantenoptik und Photonik
Q 40: Poster – Photonics
Q 40.20: Poster
Mittwoch, 4. März 2026, 17:00–19:00, Philo 1. OG
Rydberg quantum optics based on integrated photonic waveguides immersed in a hot atomic vapor — •Alexandra Köpf1,2, Annika Belz1, Xiaoyu Cheng1, Benyamin Shnirman1,2, Hadiseh Alaeian3, Harald Kübler1, Robert Löw1, and Tilman Pfau1 — 15. Physikalisches Institut and Center for Integrated Quantum Science and Technology, Universität Stuttgart, Germany — 2Institut für Mikroelektronik Stuttgart (IMS-Chips), Stuttgart, Germany — 3Departments of Electrical & Computer Engineering and Physics & Astronomy, Purdue University, West Lafayette, USA
The combination of thermal atomic vapors with nanophotonic structures provides a unique platform for the exploitation of atom-photon and light induced atom-atom interactions. One major goal is to enhance the corresponding non-linearities from the few to the single photon level by either strong enough coupling or the Rydberg blockade effect. In detail, we study a chip-scale platform based on silicon nitride waveguides integrated into a rubidium vapor cell where the evanescent fields of the photonic waveguides can interact with the atoms in specific regions. By underetching the structures we can further enhance the coupling of the evanescent fields with the atomic vapor. The main focus lies currently in the combination of underetched tapered waveguides with high resolution spectroscopy. In a first experiment it was shown that the transit time broadening is reduced to a level, that sub-Doppler features can be observed, such as EIT. In a second approach we excite Rydberg atoms (in the 32S state) within the evanescent field of a tapered nanowaveguide.
Keywords: hot vapor; integrated photonics; waveguide; Rydberg atoms