Fully integrated quantum magnetometer based on nitrogen-vacancy centers

Magnetic field detection plays an important role in various fields, such as scientific research and industrial applications. Increasing attention has been paid to magnetometers based on quantum systems due to their capacity to achieve high sensitivity and precision. The nitrogen-vacancy center in diamond is recognized to be a promising candidate for quantum sensing due to its potential in realizing high sensitivity, nanoscale spatial resolution, good biocompatibility, and the capability of working under room-temperature conditions. However, implementing a comprehensively miniaturized and low-power-consumption nitrogen-vacancy magnetometer with subnanotesla sensitivity, which leads to practical applications, is still a challenge. Here, we present a compact magnetometer with full integration of all the required functional modules. The magnetometer can achieve a sensitivity of $390\phantom{\rule{0.2em}{0ex}}\mathrm{pT}/\sqrt{\mathrm{Hz}}$ within a volume of $10.5\phantom{\rule{0.2em}{0ex}}\ifmmode\times\else\texttimes\fi{}9.3\phantom{\rule{0.2em}{0ex}}\ifmmode\times\else\texttimes\fi{}4.5\phantom{\rule{0.2em}{0ex}}{\mathrm{cm}}^{3}$, and the total power consumption is 10.2 W. This work shows the way to realize practical $\mathrm{N}$-$V$ magnetometry.