Faraon's group engineers light-matter interaction at the quantum level in nanophotonic devices, notably rare-earth-ion crystals coupled to nanocavities for optical quantum memories and spin-photon interfaces, and metasurface/meta-optic elements for imaging; work spans quantum networks and nanophotonic sensing. For context, this complements the established paradigm of NV-diamond ensemble magnetometry (Hahn-echo/DEER, nanoscale NMR, T1 relaxometry) operating near pT/√Hz sensitivity.