Charge state cycle of lead-vacancy centers in diamond driven by multi-color laser irradiation

ORAL

Abstract

Group-IV vacancy centers in diamond is one of the leading candidates for the solid-state spin qubit due to their excellent optical and spin properties. Because the charge states determine the electronic structure, only specific configurations exhibit magneto-optical activity. Thus, the control over the charge state is fundamental for quantum applications. In this study, we report the first observation of a high-efficiency charge cycling of the lead-vacancy centers (PbV) using an optical method based on non-resonant laser irradiation [1]. Under blue light irradiation, a negatively charged PbV center transitions to a dark state, with a population up to 99.9%. Subsequent green laser irradiation repumps the PbV center into the negatively charged state with a population up to 89%. This multi-color laser irradiation method enables the tunable manipulation over the charge state of the PbV centers. In addition, the analysis of charge dynamics suggests that the dark state created by blue laser irradiation is neutral state. Our results determine the condition for the stable presence of the negatively charged PbV and quantify its population, providing a foundation for future studies of its spin properties. Furthermore, our work also indicates a potential optical pathway to access the neutral PbV centers, opening new opportunities for its exploration.

[1] Y. Chen, et.al., arXiv:2508.18991 (2025)

*This work is supported by JSPS KAKENHI Grant Number JP22H04962, the MEXT Quantum Leap Flagship Program (MEXT Q-LEAP) Grant Number JPMXS0118067395, JST Moonshot R&D Grant Number JPMJMS2062, JST ASPIRE JPMJAP24C1, and Council for Science, Technology and Innovation (CSTI), 3rd Cross-ministerial Strategic Innovation Promotion Program (SIP) Quantum.

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Publication: Y. Chen, Y. Miyamoto, E. Ota, R. Abe, T. Taniguchi, S. Onoda, M. Hatano, T. Iwasaki, Optical charge state manipulation of lead-vacancy centers in diamond, arXiv:2508.18991 (2025)

Presenters

  • Yiyang Chen

    • Dapartment of Electrical and Electronic Engineering, School of Engineering, Institute of Science Tokyo
    • Institute of Science Tokyo
    • Department of Electrical and Electronic Engineering, School of Engineering, Institute of Science Tokyo

Authors

  • Yiyang Chen

    • Dapartment of Electrical and Electronic Engineering, School of Engineering, Institute of Science Tokyo
    • Institute of Science Tokyo
    • Department of Electrical and Electronic Engineering, School of Engineering, Institute of Science Tokyo

  • Yoshiyuki Miyamoto

    • Advanced Power Electronics Research Center, National Instituteof Advanced Industrial Science and Technology

  • Eiki Ota

    • Dapartment of Electrical and Electronic Engineering, School of Engineering, Institute of Science Tokyo
    • Department of Electrical and Electronic Engineering, School of Engineering, Institute of Science Tokyo

  • Ryotaro Abe

    • Department of Electrical and Electronic Engineering, School of Engineering, Institute of Science Tokyo

  • Takashi Taniguchi

    • National Institute for Materials Science
    • Research Center for Materials Nanoarchitectonics, National Institute for Materials Science
    • International Center for Materials Nanoarchitectonics, National Institute of Materials Science, 1-1 Namiki Tsukuba, Ibaraki 305-0044, Japan
    • Research Center for Functional Materials, National Institute of Materials Science, 1-1 Namiki Tsukuba, Ibaraki 305-0044, Japan

  • Shinobu Onoda

    • Takasaki Advanced Radiation Research Institute, National Institute for Quantum Science and Technology
    • National Institutes for Quantum Science and Technology
    • Takasaki Advanced Radiation Research Institute, National Institutes for Quantum Science and Technology

  • Mutsuko Hatano

    • Dapartment of Electrical and Electronic Engineering, School of Engineering, Institute of Science Tokyo
    • Institute of Science Tokyo
    • Department of Electrical and Electronic Engineering, School of Engineering, Institute of Science Tokyo

  • Takayuki Iwasaki

    • Dapartment of Electrical and Electronic Engineering, School of Engineering, Institute of Science Tokyo
    • Institute of Science Tokyo
    • Department of Electrical and Electronic Engineering, School of Engineering, Institute of Science Tokyo