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Q: Fachverband Quantenoptik und Photonik
Q 21: Ultracold Atoms (Trapping and Cooling)
Q 21.3: Vortrag
Dienstag, 10. März 2020, 14:45–15:00, f442
Real-time imaging of single laser-cooled atoms coupled to a nanoscale optical waveguide — Yijian Meng1, •Christian Liedl2, Sebastian Pucher1,2, Arno Rauschenbeutel1,2, and Philipp Schneeweiss1,2 — 1VCQ, TU Wien – Atominstitut, Stadionallee 2, 1020 Wien, Austria — 2Department of Physics, Humboldt-Universität zu Berlin, 10099 Berlin, Germany
Here, we demonstrate single-atom sensitive imaging of atoms coupled to the evanescent mode of an optical nanofiber in real-time. Degenerate Raman cooling is used to keep the atoms close to the motional ground state of the nanofiber-based trapping sites [1] and to generate the atomic fluorescence signal for imaging. We obtain a signal-to-noise ratio sufficient to identify an atom within 100 ms, allowing us to record movies of single atoms with up to 30 frames during one experimental run.
When, e.g., two atoms are coupled to the nanofiber, their emission into the waveguide can interfere constructively or destructively, depending on the inter-atomic distance. Using our imaging technique, we measure this effect and obtain good agreement with expectations.
Our results enable a new level of control for cold-atom based nanophotonic systems. For example, by post-selecting measurements on a certain number of atoms, also complex light-matter interaction phenomena can be understood atom by atom. Moreover, our findings provide the basis for live, position-resolved feedback onto the experimental system.
[1] Y. Meng et al., Phys. Rev. X 8, 031054 (2018).