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# Sub-nanotesla Sensitivity at the Nanoscale with a Single Spin

...+6
May 2022

High-sensitivity detection of microscopic magnetic field is essential in manyfields. Here we report that a sensitivity of 0.6 $\rm{nT/\sqrt{Hz}}$ isachieved experimentally with a 30-nm-deep nitrogen-vacancy defect in diamond.The achieved sensitivity is substantially enhanced by integrating with multiplequantum techniques, including real-time-feedback initialization, dynamicaldecoupling with shaped pulses, repetitive readout via quantum logic, and soforth. Our results represent the best performance combining magneticsensitivity and spatial resolution. Therefore, our magnetic sensors will shednew light on searching new physics beyond the standard model, investigatingmicroscopic magnetic phenomena in condensed matters, and detection of lifeactivities at the sub-cellular scale.

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