Diamond-based quantum magnetometers are more sensitive to oscillating (AC) magnetic fields than static (DC) fields because the crystal impurity-induced ensemble dephasing time T * 2 , the relevant sensing time for a DC field, is much shorter than the spin coherence time T2, which determines the sensitivity to AC fields. Here we demonstrate measurement of DC magnetic fields using a physically rotating ensemble of nitrogen-vacancy centres at a precision ultimately limited by T2 rather than T * 2 . The rotation period of the diamond is comparable to T2 and the angle between the NV axis and the target magnetic field changes as a function of time, thus upconverting the static magnetic field to an oscillating field in the physically rotating frame. Using spin-echo interferometry of the rotating NV centres, we are able to perform measurements for over a hundred times longer compared to a conventional Ramsey experiment. With modifications our scheme could realise DC sensitivities equivalent to demonstrated NV center AC magnetic field sensitivities of order 0.1 nT Hz −1/2 .
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