DC Quantum Magnetometry Below the Ramsey Limit

Abstract

We demonstrate quantum sensing of dc magnetic fields that exceeds the sensitivity of conventional $T_2^{\ast }$-limited dc magnetometry by more than an order of magnitude. We used nitrogen-vacancy centers in a diamond rotating at periods comparable to the spin coherence time, and characterize the dependence of magnetic sensitivity on measurement time and rotation speed. Our method up-converts only the dc field of interest and preserves the quantum coherence of the sensor. These results definitively improve the sensitivity of a quantum magnetometer to dc fields, an important and useful addition to the quantum sensing toolbox.

arXiv comment5pgs main text, 10 pgs supplementary

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Cited by in corpus (3)

• Quantum control and Berry phase of electron spins in rotating levitated diamonds in high vacuum
• Dephasing-tolerant quantum sensing for transverse magnetic fields with spin qudits
• Bichromatic microwave manipulation of the NV center nuclear spin using transition not detectable via optically detected magnetic resonance