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arXiv · 2503.18925

Strong coupling of dipole trapped atomic ensembles to a ring cavity

T. Olney·V. Naniyil·V. Boyer·J. Goldwin·A. B. Deb
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Abstract

Cavity quantum electrodynamics systems using atoms in resonant optical cavities are central elements of many applications such as quantum networks and quantum-enhanced sensing. We present a novel experimental setup that achieves strong spatial mode-matching between a resonant mode of a triangular ring resonator and an ensemble of ultracold atoms trapped in an optical dipole trap. We realise a large-volume, 0.5\,mK deep cavity-assisted optical dipole trap from a laser beam of modest power locked to a resonant mode of the cavity through the intracavity power build-up effect, allowing efficient loading of the trap from a magneto-optical trap. We observe dipole trapping of atoms through the vacuum Rabi splitting of the transmission spectrum of a weak probe beam near resonant with the cavity, which demonstrates collective strong coupling of the ensemble of atoms to the cavity after the magneto-optical trap is turned off. The work paves the way for a highly suitable platform for cavity-assisted quantum sensing of magnetic and electric fields.

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T. Olney, V. Naniyil, V. Boyer, J. Goldwin, A. B. Deb. 2025-03-24. Strong coupling of dipole trapped atomic ensembles to a ring cavity. https://arxiv.org/abs/2503.18925

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