Toward a Laser‐Free Diamond Magnetometer for Microwave Fields
At a Glance
Section titled “At a Glance”| Metadata | Details |
|---|---|
| Publication Date | 2023-11-22 |
| Journal | Advanced Quantum Technologies |
| Authors | Pengju Zhao, Haodong Wang, Fei Kong, Zhecheng Wang, Yuhang Guo |
| Institutions | University of Science and Technology of China, Suzhou University of Science and Technology |
Abstract
Section titled “Abstract”Abstract The nitrogen‐vacancy (NV) center in diamond is a unique magnetometer. Its atomic size enables integrations of a tremendous amount () of NV centers in a bulk diamond with a sensitivity scaling as . However, such a bulk sensor requires a high‐power laser to polarize and read out the NV centers. The increasing thermal damage and additional noises associated with high‐power lasers hinder the growth of , and thus limit the sensitivity at picotesla level. Here, it shows a relaxometry‐based microwave magnetometer that the power density is determined by the relaxation time . By cooling the diamond sensor to prolong the (s), the required power density further reduces to , of the saturation value. This work paves the way for the utilization of large‐size diamond to promote the sensitivity of diamond magnetometer to femtotesla level and beyond.