Group-IV vacancy centers in diamond exhibit excellent optical and spin coherence properties, making them highly promising and scalable spin qubit candidates. Since only specific charge states are magneto-optically active, control over the charge state is fundamental for quantum applications. Here, we realize the charge state control of lead-vacancy centers (PbV) through multi-color laser irradiation. We achieve tunable population manipulation of the negatively charged state from 0 to 89%, paving the way for spin control of the negatively charged PbV center. Furthermore, through analysis of charge state dynamics, we propose a charge cycle between the neutral and negatively charged states, indicating a possible pathway to the neutral PbV center with a spin-1 system.
@article{arxiv.2508.18991,
title = {Optical charge state manipulation of lead-vacancy centers in diamond},
author = {Yiyang Chen and Yoshiyuki Miyamoto and Eiki Ota and Ryotaro Abe and Takashi Taniguchi and Shinobu Onoda and Mutsuko Hatano and Takayuki Iwasaki},
journal= {arXiv preprint arXiv:2508.18991},
year = {2025}
}