Recently, the Quantum Precision Measurement Laboratory of the department of Physics has made important progress in the engineering and practical application of quantum magnetometers. The relevant research results are published online in Review of Scientific Instruments, an important international journal in the field of instruments. (Rev. Sci. Instrum. 94, 014703 (2023) and Rev. Sci. Instrum. 93, 125105(2022))。

Nitrogen-vacancy (NV) centers in diamond are extremely promising solid-state spin quantum sensors for magnetic field in recent years. Based on the NV center ensemble, it is possible to accurately detect the DC magnetic field in the order of PT at room temperature. Here, we report on an integrated and scalable experimental system based on a field-programmable-gate-array (FPGA) chip assisted with high-speed peripherals

for NV-ensemble magnetometry, which presents a compact and compatible design containing high-speed data acquisition, oscilloscopes, signal generator, spectrum analyzer, lock-in amplifier, proportional-integral-derivative feedback controller, etc. At the same time, PC software is developed based on Python language, and the system can achieve almost automatic experimental testing process. Combined with artificial intelligence, machine learning and other fields, it is expected to further improve the sensitivity of NV center ensemble magnetometer. Such as, we proposed the scheme which is combined with the particle swarm algorithm. By adjusting the bias magnetic field adaptively, this scheme could completely overlap the transitions corresponding to NV centers in different directions and further increase the magnetic sensitivity.

 The first author of the two-research works is a master's student in the department of Physics, and the corresponding author is Professor Bing Chen, Dr. Zhifei Yu and Professor Nanyang Xu of Zhejiang Laboratory.