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THU: Thursday Contributed Sessions
THU 13: Poster Session: Applications
THU 13.65: Poster
Donnerstag, 11. September 2025, 16:30–18:30, ZHG Foyer 1. OG
Development of spin-impurity controlled nanodiamonds for quantum sensing — •Keisuke Oshimi1,2, Hitoshi Ishiwata3, Hiromu Nakashima1, Sara Mandić1, Hina Kobayashi1, Minori Teramoto4, Hirokazu Tsuji4, Yoshiki Nishibayashi4, Yutaka Shikano5,6, Toshu An7, and Masazumi Fujiwara1 — 1Okayama University, Okayama, Japan — 2Humboldt-Univerität zu Berlin, Berlin, Germany — 3The National Institutes for Quantum Science and Technology, Chiba, Japan — 4Sumitomo Electric Industries, Ltd., Hyogo, Japan — 5University of Tsukuba, Ibaraki, Japan — 6Chapman University, California, United States — 7Japan Advanced Institute of Science and Technology, Ishikawa, Japan
The nitrogen vacancy (NV) center in fluorescent nanodiamonds (FNDs) is a promising quantum sensor for detecting physical parameters at the nanoscale via spin-based measurements. In quantum sensing, achieving long spin relaxation times in FNDs is essential to improve measurement sensitivity. Here, we present bright FNDs containing 0.6-1.3-ppm negatively charged NV centers by enriching spin-less 12C-carbon isotopes and reducing substitutional nitrogen spin impurities. They show average spin-relaxation times of T1 = 0.68 ms (T1max = 1.6 ms) and T2 = 3.2 µ s (T2max = 5.4 µ s), which are 5- and 11-fold longer than conventional FNDs, respectively. These enhanced spin properties enable shot-noise-limited temperature measurements with a sensitivity of approximately 0.28 K/√Hz. As a demonstration of biological application, we performed T1and T2 measurements in live cells.
Keywords: NV center; Nanodiamond; ODMR; Spin coherence; Quantum sensing