Sun's group develops solid-state quantum photonics - color-center and quantum-emitter spin-photon interfaces integrated with nanophotonics - to build high-dimensional photonic quantum registers and entanglement-distribution nodes for a quantum internet; recent NSF CAREER support targets quantum-network hardware. For context, this complements the established paradigm of NV-diamond ensemble magnetometry (Hahn-echo/DEER, nanoscale NMR, T1 relaxometry) operating near pT/√Hz sensitivity.