Low Field Nano-NMR via Three-Level System Control

Conventional control strategies for nitrogen-vacancy centers in quantum sensing are based on a two-level model of their triplet ground state. However, this approach fails in regimes of weak bias magnetic fields or strong microwave pulses, as we demonstrate. To overcome this limitation, we propose a novel control sequence that exploits all three levels by addressing a hidden Raman configuration with microwave pulses tuned to the zero-field transition. We report excellent performance in typical dynamical decoupling sequences, opening up the possibility for nano-NMR operation in low field environments.

Automated summary

Conventional control strategies based on a two-level model for nitrogen-vacancy centers fail in weak bias magnetic fields or strong microwave pulses. A novel control sequence that addresses a hidden Raman configuration with microwave pulses tuned to the zero-field transition shows excellent performance in typical dynamical decoupling sequences. This opens up possibilities for nano-NMR operation in low field environments.