May 2020
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30 Reads
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18 Citations
Journal of the Physical Society of Japan
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May 2020
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30 Reads
·
18 Citations
Journal of the Physical Society of Japan
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.
... 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]. ...
May 2020
Journal of the Physical Society of Japan