Wickenbrock develops atomic magnetometry and zero-to-ultralow-field NMR for chemical analysis and fundamental-physics searches (CASPEr, GNOME), including diamond- and OPM-based ZULF detection. This vapour-phase approach reaches femto-to-picotesla sensitivities complementary to NV-center diamond ensemble quantum sensors (DEER, nano-NMR, T1 relaxometry) that operate near the pT/sqrt(Hz) regime.