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arXiv · 2111.01119

Coupling single atoms to a nanophotonic whispering-gallery-mode resonator via optical guiding

Xinchao Zhou·Hikaru Tamura·Tzu-Han Chang·Chen-Lung Hung
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Abstract

We demonstrate an efficient optical guiding technique for coupling cold atoms in the near field of a planar nanophotonic circuit, and realize large atom-photon coupling to a whispering-gallery mode in a microring resonator with a single-atom cooperativity $C\gtrsim 8$. The guiding potential is created by diffracted light on a nanophotonic waveguide that smoothly connects to a dipole trap in the far field for atom guiding with subwavelength precision. We observe atom-induced transparency for light coupled to a microring, characterize the atom-photon coupling rate, extract guided atom flux, and demonstrate on-chip photon routing by single atoms. Our demonstration promises new applications with cold atoms on a nanophotonic circuit for chiral quantum optics and quantum technologies.

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Xinchao Zhou, Hikaru Tamura, Tzu-Han Chang, Chen-Lung Hung. 2021-11-01. Coupling single atoms to a nanophotonic whispering-gallery-mode resonator via optical guiding. https://doi.org/10.1103/physrevlett.130.103601

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