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Quantum Information and Measurement (QIM)

Quantum optics of cold atomic ensembles trapped in evanescent fields

Jérémy Raskop, Neil Corzo, Jérémy Berroir, Aveek Chandra, A. S. Sheremet, Baptiste Gouraud, Julien Laurat

Published Jan 1, 2019• 0 citations
Publisher

Abstract

By trapping cold atoms in the evanescent field of an optical nanofiber, we store and reflect guided pulses at the single-photon level. We also herald, store and read out a single waveguide-coupled collective atomic excitation.
DOI
10.1364/qim.2019.f4c.2

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Tapered optical fibers with a nanofiber waist are versatile tools for interfacing light and matter. In this context, laser-cooled atoms trapped in the evanescent field surrounding the optical nanofiber are of particular interest: They exhibit both long ground-state coherence times and efficient coupling to fiber-guided fields. Here, we demonstrate electromagnetically induced transparency, slow light, and the storage of fiber-guided optical pulses in an ensemble of cold atoms trapped in a nanofiber-based optical lattice. We measure a slow-down of light pulses to group velocities of 50 m/s. Moreover, we store optical pulses at the single photon level and retrieve them on demand in the fiber after 2 microseconds with an overall efficiency of (3.0 +/- 0.4) %. Our results show that nanofiber-based interfaces for cold atoms have great potential for the realization of building blocks for future optical quantum information networks.