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.

5pgs main text, 10 pgs supplementary

References in corpus (8)

• High-sensitivity diamond magnetometer with nanoscale resolution
• Coherence of Nitrogen-Vacancy Electronic Spin Ensembles in Diamond
• Broadband Magnetometry and Temperature Sensing with a Light Trapping Diamond Waveguide
• Broadband magnetometry by infrared-absorption detection of nitrogen-vacancy ensembles in diamond
• Multipulse Double-Quantum Magnetometry With Near-Surface Nitrogen Vacancy Centers
• Magnetic pseudo-fields in a rotating electron-nuclear spin system
• Spin-mechanics with nitrogen-vacancy centers and trapped particles
• Anisotropic electron-nuclear interactions in a rotating quantum spin bath

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