Freiburg 2024 – wissenschaftliches Programm

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Q: Fachverband Quantenoptik und Photonik

Q 24: Poster II

Q 24.39: Poster

Dienstag, 12. März 2024, 17:00–19:00, KG I Foyer

Photon Storage using Cold Caesium in an Interrupted Waveguide — •Matt Overton, David Johnson, Danielle Baldolini, Nathan Cooper, and Lucia Hackermuller — School of Physics and Astronomy, University of Nottingham, UK

Cold atoms are useful for many quantum information applications. Their strong interactions with light give them many uses in atom-photon junctions. However, one difficulty with cold atoms is integrating them with waveguides and other photonic devices. Here we demonstrate a method that involves trapping the atoms inside a micromachined hole through an optical fibre. By carefully selecting the geometry of the cavity, one can tune the transmission of light through it, with convex parabolic surfaces having the greatest transmission [1].

Here we use caesium atoms to demonstrate electromagnetically induced transparency (EIT) within the waveguide hole. EIT allows the transparency of a medium to be controlled using a laser field. The effects this has on the complex susceptibility leads to slow light and (if the control laser power is reduced to zero) can also lead to photon storage. Integrating cold atoms into an optical waveguide for storage like this has obvious applications in quantum computing and quantum communication.

[1] Cooper, N., Da Ros, E., Briddon, C. et al. Prospects for strongly coupled atomphoton quantum nodes. Sci Rep 9, 7798 (2019)