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Robust high-dynamic-range vector magnetometry with nitrogen-vacancy centers in diamond

Robust high-dynamic-range vector magnetometry with nitrogen-vacancy centers in diamond

We demonstrate a robust, scale-factor-free vector magnetometer, which uses a closed-loop frequency-locking scheme to simultaneously track Zeeman-split resonance pairs of nitrogen-vacancy (NV) centers in diamond. This technique offers a three-orders-of-magnitude increase in dynamic range compared to open-loop methodologies; is robust against fluctuations in temperature, resonance linewidth, and contrast; and allows …