Bonn 2025 – wissenschaftliches Programm

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Q: Fachverband Quantenoptik und Photonik

Q 68: Quantum Technologies (Color Centers and Ion Traps) II (joint session Q/QI)

Q 68.5: Vortrag

Freitag, 14. März 2025, 12:15–12:30, HS Botanik

Enhanced atom-photon interactions based on integrated waveguides immersed in hot atomic vapor — •Annika Belz¹, Benyamin Shnirman^1,2, Xiaoyu Cheng¹, Harald Kübler¹, Hadiseh Alaeian³, Robert Löw¹, and Tilman Pfau¹ — ¹5. Physikalisches Institut, 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 vapor with nanophotonic structures provides a unique platform for the manipulation of atom-photon and light induced atom-atom interactions and can exhibit large optical non-linearities, even at the few photon level.

We can further enhance these non-linearities via an enlarged Purcell factor using slot waveguides. We observe saturable repulsive interactions of the atoms within the slot as an intensity dependent blue shift. In order to verify the nature of the non-linearity in more detail we incorporate an integrated Mach-Zehnder interferometer to access also the non-linear phase shift.

Keywords: Hot vapor; Integrated photonics; Waveguide; Dipole-dipole interaction; Nonlinear effects