H3 diamond color centers for quantum magnetometry

For the first time, we demonstrated the sensitivity of diamond H3 color centers to a magnetic field. The diamond H3 color centers represent the neutral charge state of the $\mathrm{N}-\mathrm{V}-\mathrm{N}$ centers, i.e. two donor electrons are localized in the vacancy from nitrogen atoms included in the center structure. This suggests the spin splitting of the electronic states of the H3 center into spin sublevels. Thus, H 3 (or $\mathrm{N}_{2} \mathrm{~V}^{0}$) diamond color centers may be used in quantum sensors and, possibly, in quantum computing.