Waveguide-coupled single collective excitation of atomic arrays

Neil V. Corzo, Jérémy Raskop, Aveek Chandra, Alexandra S. Sheremet, Baptiste Gouraud and Julien Laurat ()
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Neil V. Corzo: Laboratoire Kastler Brossel, Sorbonne Université, CNRS, ENS-Université PSL, Collège de France
Jérémy Raskop: Laboratoire Kastler Brossel, Sorbonne Université, CNRS, ENS-Université PSL, Collège de France
Aveek Chandra: Laboratoire Kastler Brossel, Sorbonne Université, CNRS, ENS-Université PSL, Collège de France
Alexandra S. Sheremet: Laboratoire Kastler Brossel, Sorbonne Université, CNRS, ENS-Université PSL, Collège de France
Baptiste Gouraud: Laboratoire Kastler Brossel, Sorbonne Université, CNRS, ENS-Université PSL, Collège de France
Julien Laurat: Laboratoire Kastler Brossel, Sorbonne Université, CNRS, ENS-Université PSL, Collège de France

Nature, 2019, vol. 566, issue 7744, 359-362

Abstract: Abstract Considerable efforts have been recently devoted to combining ultracold atoms and nanophotonic devices1–4 to obtain not only better scalability and figures of merit than in free-space implementations, but also new paradigms for atom–photon interactions5. Dielectric waveguides offer a promising platform for such integration because they enable tight transverse confinement of the propagating light, strong photon–atom coupling in single-pass configurations and potentially long-range atom–atom interactions mediated by the guided photons. However, the preparation of non-classical quantum states in such atom–waveguide interfaces has not yet been realized. Here, by using arrays of individual caesium atoms trapped along an optical nanofibre6,7, we observe a single collective atomic excitation8,9 coupled to a nanoscale waveguide. The stored collective entangled state can be efficiently read out with an external laser pulse, leading to on-demand emission of a single photon into the guided mode. We characterize the emitted single photon via the suppression of the two-photon component and confirm the single character of the atomic excitation, which can be retrieved with an efficiency of about 25%. Our results demonstrate a capability that is essential for the emerging field of waveguide quantum electrodynamics, with applications to quantum networking, quantum nonlinear optics and quantum many-body physics10,11.

Date: 2019
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DOI: 10.1038/s41586-019-0902-3

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