17-22 July 2022
Royal Conservatory of Music, Toronto
America/Toronto timezone

Collective excitation and decay of waveguide-coupled atoms: from timed Dicke states to inverted ensembles

20 Jul 2022, 17:00
1h 30m
Hart House (Hart House)

Hart House

Hart House

7 Hart House Cir, Toronto, ON M5S 3H3
Poster presentation Quantum optics and hybrid quantum systems Poster session


The collective absorption and emission of light by an ensemble of atoms is at the heart of many fundamental quantum optical effects and the basis for numerous applications. However, beyond weak excitation, both experiment and theory become increasingly challenging. Here, we explore the regimes from weak excitation to inversion with ensembles of up to one thousand atoms that are trapped and optically interfaced using the evanescent field surrounding an optical nanofiber. We realize strong inversion, with about 80% of the atoms being excited, and study their subsequent radiative decay into the guided modes. The data is very well described by a simple model that assumes a cascaded interaction of the guided light with the atoms. Our results contribute to the fundamental understanding of the collective interaction of light and matter and are relevant for applications ranging from quantum memories to sources of nonclassical light to optical frequency standards.

Presenter name Christian Liedl

Primary authors

Christian Liedl (Humboldt University of Berlin) Mr Sebastian Pucher (Humboldt University of Berlin) Mr Felix Tebbenjohanns (Humboldt University of Berlin) Dr Philipp Schneeweiss (Humboldt University Berlin) Prof. Arno Rauschenbeutel (Humboldt University Berlin)

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