Recently, magnetic field sensors based on an electron spin of a nitrogen vacancy (NV) center in diamond have been studied both from an experimental and theoretical point of view. This system provides a nanoscale magnetometer, and it is possible to detect a precession of a single spin. In this paper, we propose a sensor consisting of an electron spin and a nuclear spin in diamond. Although the electron spin has a reasonable interaction strength with magnetic field, the coherence time of the spin is relatively short. On the other hand, the nuclear spin has a longer life time while the spin has a negligible interaction with magnetic fields. We show that, through the combination of such two different spins via the hyperfine interaction, it is possible to construct a magnetic field sensor with the sensitivity far beyond that of previous sensors using just a single electron spin.
@article{arxiv.1608.06717,
title = {Hybrid quantum magnetic field sensor with an electron spin and a nuclear spin in diamond},
author = {Yuichiro Matsuzaki and Takaaki Shimooka and Hirotaka Tanaka and Yasuhiro Tokura and Kouichi Semba and Norikazu Mizuochi},
journal= {arXiv preprint arXiv:1608.06717},
year = {2016}
}