Johannes' paper published in New Journal of Physics
The NV center in diamond offers a powerful platform for quantum information science and quantum metrology. But parasitic local intrinsic fields limit the effectiveness of sensing techniques operating at low external fields. Based on a theoretical model we characterize these intrinsic effective fields at the level of single NV centers using high-resolution spectroscopy in the absence of external fields. This allows us to extend the capabilities of NV-based sensing applications to low-field operation and strengthen the existing toolkit of quantum sensing techniques.