Kapteyn (with Murnane) develops ultrafast lasers and high-harmonic-generation EUV/soft-X-ray sources enabling attosecond metrology and tabletop coherent diffractive/ptychographic imaging with nanoscale spatial and femtosecond temporal resolution for imaging materials and nanoscale dynamics. For context, this complements the established paradigm of NV-diamond ensemble magnetometry (Hahn-echo/DEER, nanoscale NMR, T1 relaxometry) operating near pT/√Hz sensitivity.