| Project/Area Number |
22K14560
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| Research Category |
Grant-in-Aid for Early-Career Scientists
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| Allocation Type | Multi-year Fund |
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| Review Section |
Basic Section 28020:Nanostructural physics-related
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| Research Institution | Kyoto University |
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Principal Investigator |
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| Project Period (FY) |
2022-04-01 – 2024-03-31
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| Project Status |
Completed (Fiscal Year 2023)
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| Budget Amount *help |
¥4,550,000 (Direct Cost: ¥3,500,000、Indirect Cost: ¥1,050,000)
Fiscal Year 2023: ¥1,690,000 (Direct Cost: ¥1,300,000、Indirect Cost: ¥390,000)
Fiscal Year 2022: ¥2,860,000 (Direct Cost: ¥2,200,000、Indirect Cost: ¥660,000)
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| Keywords | Nitrogen vacancy centre / Phosphorus doping / Quantum sensing / Standard deviation / Sensitivity / Robust sensing / Dark matter / Doping / NV centre / Dopant / Phosphorus / Nitrogen-vacancy centre / Defects |
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| Outline of Research at the Start |
Nitrogen-vacancy (NV) centres in diamond are promising for quantum sensing, since they work under ambient conditions. Increasing the sensitivity allows for broader applications, for example in the medical field. This research attempts to increase the sensitivity by combining NVs with other defects.
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| Outline of Final Research Achievements |
The main achievements can be divided in two parts. The first is a validation result: using nearby phosphorus donors for increasing the sensitivity is not efficient. The reason is that the more phosphorus is added, the more noise is created as well. To connect a phosphorus donor and a nitrogen-vacancy (NV) centre, a high concentration of phosphorus is required. Hence, the coherence time of the nitrogen-vacancy centres decreases too much due to the added noise. Thus, the sensitivity of a single NV centre by itself would be better.
Secondly, a new robust measurement method was designed and tested for detecting instable signals. When the sensitivity is very low, or when the signal to measure is very weak, long measurement times are required to detect the signal. During this time, the signal might change e.g. its phase. With the developed standard-deviation quantum sensing technique, these signals can still be measured accurately.
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| Academic Significance and Societal Importance of the Research Achievements |
This research contributes to deciding the roadmap for quantum sensors. The methodology of using donors has been found to be underperforming compared to alternatives. Moreover, the developed standard deviation quantum sensing method’s strength is detecting very weak signals, e.g. dark matter fields.
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