Enhanced Emission and Two-Photon Interference of Lead-Vacancy Centers in Diamond Solid Immersion Lenses
Abstract
A negatively charged lead-vacancy (PbV-) center in diamond is a novel quantum system which can be operated at a high temperature above 4 K owing to its large ground state splitting. To unlock the quantum properties of the PbV- center, the enhancement of the fluorescence intensity is a key issue. Here, we demonstrate enhanced emission from PbV- centers by a factor of approximately 10 using solid immersion lenses (SILs) fabricated on rough diamond surface caused by high-temperature anneal over 2000°C. Resonant excitation reveals the narrow emission close to the transform-limited linewidth. Furthermore, we demonstrate two-photon interference using one single PbV- center in an SIL. This enhanced emission and indistinguishability will lead to further development of the PbV- center towards quantum network node applications.
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BibTeX
@misc{hirai2026enhanced,
title = {{Enhanced Emission and Two-Photon Interference of Lead-Vacancy Centers in Diamond Solid Immersion Lenses}},
author = {Koyo Hirai and Eiki Ota and Yiyang Chen and Ren Kato and Peng Wang and Toshiharu Makino and Takashi Taniguchi and Masashi Miyakawa and Shinobu Onoda and Mutsuko Hatano and Takayuki Iwasaki},
howpublished = {arXiv},
year = {2026},
month = sep,
doi = {10.48550/arxiv.2609.19220},
eprint = {2609.19220},
archivePrefix = {arXiv},
url = {https://arxiv.org/abs/2609.19220},
}
RIS
TY - UNPB
TI - Enhanced Emission and Two-Photon Interference of Lead-Vacancy Centers in Diamond Solid Immersion Lenses
AU - Koyo Hirai
AU - Eiki Ota
AU - Yiyang Chen
AU - Ren Kato
AU - Peng Wang
AU - Toshiharu Makino
AU - Takashi Taniguchi
AU - Masashi Miyakawa
AU - Shinobu Onoda
AU - Mutsuko Hatano
AU - Takayuki Iwasaki
PY - 2026
DA - 2026/09/16
PB - arXiv
DO - 10.48550/arxiv.2609.19220
UR - https://arxiv.org/abs/2609.19220
AB - A negatively charged lead-vacancy (PbV-) center in diamond is a novel quantum system which can be operated at a high temperature above 4 K owing to its large ground state splitting. To unlock the quantum properties of the PbV- center, the enhancement of the fluorescence intensity is a key issue. Here, we demonstrate enhanced emission from PbV- centers by a factor of approximately 10 using solid immersion lenses (SILs) fabricated on rough diamond surface caused by high-temperature anneal over 2000°C. Resonant excitation reveals the narrow emission close to the transform-limited linewidth. Furthermore, we demonstrate two-photon interference using one single PbV- center in an SIL. This enhanced emission and indistinguishability will lead to further development of the PbV- center towards quantum network node applications.
ER -