2026/08/05 by Ashutosh Rathi, Keisuke Oshimi, Kento Sasaki +6
Physics and Astronomy · #quant-ph #physics.app-ph #physics.chem-ph
paper · pdf · doi:10.1021/acsnano.6c03795
published as ACS Nano 20, 17143 (2026) · Published in ACS Nano under CC-BY 4.0
arxiv created 2026/08/05 · arxiv updated 2026/08/06
Optically addressable solid-state spin defects have emerged as powerful multimodal quantum sensors, with nitrogen-vacancy (NV) centers in bulk diamond providing benchmark quantum control and sensitivity under ambient conditions. Embedding such defects in nanodiamonds (NDs) extends these capabilities to mobile probes capable of accessing complex biological and nanoscale environments. Reduced dimensions, however, introduce constraints beyond volumetric spin impurities, notably enhanced lattice strain and surface-induced noise sources, which shorten NV spin relaxation times (T1 and T2) and destabilize the NV charge state, as well as resulting in pronounced particle-to-particle variability in NDs typically produced by top-down approaches. These effects complicate both sensing performance and the quantitative interpretation of multimodal signals in realistic environments. This article provides a structured perspective on the physical mechanisms by which material properties constrain NV behavior in NDs, together with mitigation strategies that shape the robust use of these mobile quantum sensors for biosensing and nanoscale science.