Mainz 2026 – scientific programme
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Q: Fachverband Quantenoptik und Photonik
Q 28: Poster – Quantum Optics
Q 28.33: Poster
Tuesday, March 3, 2026, 17:00–19:00, Philo 2. OG
Towards an all-optical phase shifter based on integrated waveguides immersed in hot atomic vapor — •Annika Belz1, Alexandra Köpf1,2, Benyamin Shnirman1,2, Xiaoyu Cheng1, 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 vapor with nanophotonics provides a unique testbed for the manipulation of atom-photon and atom-atom interactions. While benefitting from strong miniaturization, integration and scalability, we can furthermore enhance the atom-light interaction by engineering the waveguide structures correspondingly.
Using this platform, we want to realize an all-optical phase shifter in the telecom wavelength on the few photon level, which is a fundamental building block for e.g. photonical quantum computing.
This device leverages the effective refractive index change in rubidium for 1529nm light, corresponding to the excitation from the intermediate 5P3/2 state to the 4D5/2 state, induced by 780nm light, exciting the atoms from the 5S1/2 ground state to the 5P3/2 intermediate state.
We present first free-space measurements using a Michelson interferometer characterizing the three-level system and first designs towards the integration.
Keywords: hot vapor; integrated photonics; waveguides