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

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.

17 pages, 10 figures

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• Optical trapping based on microring resonators with transverse slot structure
• Selective collective emission from a dense atomic ensemble coupled to a nanophotonic resonator
• High-Order Perfect Absorption in the Absence of Exceptional Point
• Atom-mediated deterministic generation and stitching of photonic graph states
• Collective emission and selective radiance in atomic clouds and arrays coupled to a microring resonator
• Efficient and high-fidelity entanglement in cavity QED without high cooperativity
• Hong-Ou-Mandel interferometry with cavity QED-based single-photon sources: A Quantum Jump Analysis
• A vapor-cavity-QED system for quantum computation and communication