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

• URL: http://arxiv.org/abs/2111.01119v2
• Date: Mon, 7 Nov 2022 23:34:04 GMT
• Title: Coupling single atoms to a nanophotonic whispering-gallery-mode resonator via optical guiding
• Authors: Xinchao Zhou, Hikaru Tamura, Tzu-Han Chang, Chen-Lung Hung
• Abstract summary: We demonstrate an efficient optical guiding technique for coupling cold atoms in the near field of a nanophotonic circuit. We observe atom-induced transparency for light coupled to a microring, characterize the atom-photon coupling rate, 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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• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• 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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