Journal
PHYSICAL REVIEW APPLIED
Volume 15, Issue 6, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevApplied.15.064075
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Funding
- EU via the project ASTERIQS
- ERC Advanced Grant [742610]
- SMel
- BMBF via the project MiLiQuant
- DFG via the GRK projects [2198, 2642]
- Japan Society for the Promotion of Science (JSPS) KAKENHI program [17H02751]
- Grants-in-Aid for Scientific Research [17H02751] Funding Source: KAKEN
- European Research Council (ERC) [742610] Funding Source: European Research Council (ERC)
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Nitrogen-vacancy (N-V) centers in diamond have been utilized in high-sensitivity magnetic field measurements, optimized with low-intensity optical excitation. The magnetometer achieves picotesla sensitivity in unshielded environments, showing potential for wide-bandwidth magnetometry applications.
Nitrogen-vacancy (N -V) centers in diamond have developed into a powerful solid-state platform for compact quantum sensors. However, high-sensitivity measurements usually come with additional constraints on the pumping intensity of the laser and the pulse control applied. Here, we demonstrate high-sensitivity N -V-ensemble-based magnetic field measurements with low-intensity optical excitation. Direct current magnetometry methods such as continuous-wave optically detected magnetic resonance and continuously excited Ramsey measurements combined with lock-in detection are compared to achieve an optimization. Gradiometry is also investigated as a step towards unshielded measurements of unknown gradients. The magnetometer demonstrates a minimum detectable field of 0.3-0.7 pT in a 73-s measurement when a flux guide with a sensing dimension of 2 mm is applied, corresponding to a magnetic field sensitivity of 2.6-6 pT/root Hz. Combined with our previous efforts on diamond ac magnetometry, the diamond magnetometer is promising for performing wide-bandwidth magnetometry with picotesla sensitivity and a cubic-millimeter sensing volume under ambient conditions.
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