Coherent Dark State Formation of a Lead-Vacancy Spin Qubit in Diamond

Yiyang Chen; Koyo Hirai; Tzyy Zheng Neo; Eiki Ota; Takashi Taniguchi; Masashi Miyakawa; Shinobu Onoda; Toshiharu Makino; Mutsuko Hatano; Takayuki Iwasaki

Coherent Dark State Formation of a Lead-Vacancy Spin Qubit in Diamond

Quantum Physics 2026-05-28 v1

Authors: Yiyang Chen , Koyo Hirai , Tzyy Zheng Neo , Eiki Ota , Takashi Taniguchi , Masashi Miyakawa , Shinobu Onoda , Toshiharu Makino , Mutsuko Hatano , Takayuki Iwasaki

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Abstract

A lead-vacancy (PbV) center in diamond exhibits coherent emission above the liquid helium temperature, making it highly attractive for quantum network applications. Here, we report the magneto-optical and spin properties of PbV centers in diamond. We record a spin lifetime of 12 ms at 7.5 K under large off-axis magnetic field. Furthermore, we observe formation of the coherent dark state by coherent population trapping and estimate a spin dephasing time of 354 ns at 6.5 K. This work demonstrates the outstanding thermal robustness of the PbV spin compared to other group-IV centers above 4 K.

Keywords

lead-vacancy center spin qubit coherent dark state coherent population trapping quantum network diamond

Cite

@article{arxiv.2605.27841,
  title  = {Coherent Dark State Formation of a Lead-Vacancy Spin Qubit in Diamond},
  author = {Yiyang Chen and Koyo Hirai and Tzyy Zheng Neo and Eiki Ota and Takashi Taniguchi and Masashi Miyakawa and Shinobu Onoda and Toshiharu Makino and Mutsuko Hatano and Takayuki Iwasaki},
  journal= {arXiv preprint arXiv:2605.27841},
  year   = {2026}
}

Coherent Dark State Formation of a Lead-Vacancy Spin Qubit in Diamond

Abstract

Keywords

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