dc Quantum Magnetometry below the Ramsey Limit
At a Glance
Section titled āAt a Glanceā| Metadata | Details |
|---|---|
| Publication Date | 2022-11-07 |
| Journal | Physical Review Applied |
| Authors | A. A. Wood, Alastair Stacey, A. Martin |
| Institutions | The University of Melbourne, RMIT University |
| Citations | 10 |
Abstract
Section titled āAbstractāWe demonstrate quantum sensing of dc magnetic fields that exceeds the sensitivity of conventional ${T}{2}^{\ensuremath{\ast}}$-limited dc magnetometry by more than an order of magnitude. We use 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, demonstrating that sensitivity below the ${T}{2}^{\ensuremath{\ast}}$ limit is possible and can be applied to any diamond magnetometer where ${T}{2}\ensuremath{\gg}{T}{2}^{\ensuremath{\ast}}$ to yield an order-of-magnitude sensitivity improvement.