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Trapped Ion Quantum Computing

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

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

Year

2026

Paper ID

68201

Status

Preprint

Abstract Read

~2 min

Abstract Words

90

Citations

0

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.

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  • This paper contributes to the Trapped-Ion Quantum Computing research area in the Quantum Articles archive.
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  • A lead-vacancy (PbV) center in diamond exhibits coherent emission above the liquid helium temperature, making it highly attractive for quantum network applications.

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References & Citation Signals

[1] DOI https://doi.org/arXiv:2605.27841 [2] arXiv https://arxiv.org/abs/2605.27841 [3] Publisher https://arxiv.org/abs/2605.27841

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External citation index: OpenAlex citation signal • updated 2026-06-20 08:18:20

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