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Bulletin of the American Physical Society

Quantum Sensing using Nitrogen Vacancy (NV) Centers in Nanodiamonds under Extreme Conditions

Kin On Ho, King Yau Yip, King Yiu Yu, Man Yin Leung, Yaxin Jiang, Yiu Yung Pang, Swee K. Goh, Sen Yang

Published Mar 15, 2021• 0 citations
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Nitrogen-vacancy (NV) centers in nanodiamonds have emerged as a promising quantum sensing platform for biomedical imaging applications, yet random orientations of individual particles present significant challenges in large-scale sensor calibration. In this study, we demonstrate a novel approach to simultaneously determine each particle's crystallographic axes and the surrounding local vector magnetic field. Specifically, a minimum of four distinct bias fields is required to unambiguously extract both the orientation and the local field. We validate our method experimentally using NV centers in two scenarios: (1) in a bulk diamond with known crystal orientation as a proof of concept, and (2) on various single nanodiamonds to mimic real-world applications. Our work represents a crucial step towards unlocking the full potential of nanodiamonds for advanced applications such as in-situ biomedical imaging and nanoscale sensing in complex environments.