The contactless temperature measurement at micro/nanoscale is vital to a broad range of fields in modern science and technology. The nitrogen vacancy (NV) center, a kind of diamond defect with unique spin-dependent photoluminescence, has been recognized as one of the most promising nanothermometers. However, this quantum thermometry technique has been prone to a number of possible perturbations, which will unavoidably degrade its actual temperature sensitivity. Here, for the first time, we have developed a cross-validated optical thermometry method using a bulk diamond sample containing both NV centers and silicon vacancy (SiV) centers. Particularly, the latter allowing all-optical method has been intrinsically immune to those influencing perturbations for the NV-based quantum thermometry, hence serving as a real-time cross validation system. As a proof-of-concept demonstration, we have shown a trustworthy temperature measurement under the influence of varying magnetic fields. This multi-modality approach allows a synchronized cross-validation of the measured temperature, which is required for micro/nanoscale quantum thermometry in complicated environments such as a living cell.
@article{arxiv.2303.00073,
title = {Cross-correlated quantum thermometry using diamond containing dual-defect centers},
author = {Madhav Gupta and Tongtong Zhang and Lambert Yeung and Jiahua Zhang and Yayin Tan and Yau Chuen Yiu and Shuxiang Zhang and Qi Wang and Zhongqiang Wang and Zhiqin Chu},
journal= {arXiv preprint arXiv:2303.00073},
year = {2023}
}