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arXiv · 2511.21127

Tip-enhanced quantum-sensing spectroscopy for bright and reconfigurable solid-state single-photon emitters

Hyeongwoo Lee·Taeyoung Moon·Hyeonmin Oh·Kijeong Park·Huitae Joo·Milos Toth·Igor Aharonovich·Kyoung-Duck Park
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Abstract

Atom-like defects in hexagonal boron nitride (hBN) provide room-temperature single-photon emission and coherent spin states, making them attractive for quantum-computing and -sensing applications. However, their random spatial and spectral characteristics hamper deterministic coupling with nano-optical cavities, limiting their use as bright single-photon sources and sensitive quantum sensors. Here, we present tip-enhanced quantum-sensing spectroscopy of single-photon emitters in hBN. Through precise spatial positioning of individual emitters within tip-cavities with different plasmon resonances, we adaptively control the enhancement rates of both excitation and emission, as well as the single-photon purity. In this way, optimal selection of their relative contributions can effectively reconfigure solid-state single-photon sources, with simultaneous nano-spectroscopic space- and time-resolved analyses. Furthermore, we demonstrate tip-enhanced quantum-sensing with single spin defects through optically detected magnetic resonance (ODMR) experiments in tip-coupled hBN nanoflakes. Our approach provides a unique pathway toward highly-sensitive and deterministic quantum-sensing with room-temperature single-photon emitters.

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Hyeongwoo Lee, Taeyoung Moon, Hyeonmin Oh, Kijeong Park, Huitae Joo, Milos Toth, Igor Aharonovich, Kyoung-Duck Park. 2025-11-26. Tip-enhanced quantum-sensing spectroscopy for bright and reconfigurable solid-state single-photon emitters. https://arxiv.org/abs/2511.21127

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