Takaki Ashida’s research while affiliated with Kyoto University and other places

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Publications (2)


Experimental and Theoretical Analysis of Noise Strength and Environmental Correlation Time for Ensembles of Nitrogen-Vacancy Centers in Diamond
  • Article

May 2020

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30 Reads

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18 Citations

Journal of the Physical Society of Japan

Kan Hayashi

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Takaki Ashida

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[...]

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Experimental analysis of noise strength and environmental correlation time for ensembles of nitrogen-vacancy centers in diamond

July 2019

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19 Reads

We experimentally and theoretically investigate the Hahn echo decay curve for nitrogen vacancy centers in diamond with different spin concentrations. The Hahn echo results show a non-exponential decay for low spin concentrations, while an exponential decay is dominant for high spin concentrations. By fitting the decay curve with a theoretical model, we show that both the amplitude and correlation time of the environmental noise have a clear dependence on the spin concentration. These results are essential for optimizing the NV center concentration in high-performance quantum devices, particularly quantum sensors.

Citations (1)


... Second, different effects of noise and, particularly, decoherence, which is the most dominant magnetic field noise source in diamond [Bauch, Singh, et al., 2020;Park, Lee, et al., 2022], are not included in (4). The theoretical and experimental research demonstrates that decoherence strongly depends on the spin concentration: the decoherence decay is exponential for the high spin concentration in the diamond, but it becomes nonexponential for the low spin concentration [Hayashi, Matsuzaki, et al., 2020]. Another possible way to suppress the quantum spin noise is the inserting so-called π-rotations around the nuclear spin bath into the free evolution [Chen, Qiu, et al., 2023]. ...

Reference:

On feedback control algorithms for nitrogen-vacancy-cavity quantum sensing
Experimental and Theoretical Analysis of Noise Strength and Environmental Correlation Time for Ensembles of Nitrogen-Vacancy Centers in Diamond
  • Citing Article
  • May 2020

Journal of the Physical Society of Japan