Embodiments of the present disclosure provide a spin-qubit quantum magnetometer and radar apparatus, entirely implemented in silicon and with full electrical control. By default, each detection element of the silicon-based spin-qubit quantum magnetometer and radar apparatus with full electrical control of the invention is built around a Field Effect Transistor (FET) on silicon over insulator with a back-gate as well as two front gates, which can be adjacent to one another along the Drain-Source FET channel or alternatively placed across that same channel and facing each other as corner gates.