  Developing superior quantum sensing strategies ranging from ultra-high
precision measurement to complex structural analysis is at the heart of quantum
technologies. While strategies using quantum resources, such as entanglement
among sensors, to enhance the sensing precision have been abundantly
demonstrated, the signal correlation among quantum sensors is rarely exploited.
Here we develop a novel sensing paradigm exploiting the signal correlation
among multiple quantum sensors to resolve overlapping signals from multiple
targets that individual sensors can't resolve and complex structural
construction struggles with. With three nitrogen-vacancy centers as a quantum
electrometer system, we demonstrate this multi-sensor paradigm by resolving
individual defects' fluctuating electric fields from ensemble signals. We image
the three-dimensional distribution of 16 dark electronic point-defects in
diamond with accuracy approaching 1.7 nm via a GPS-like localization method.
Furthermore, we obtain the real-time charge dynamics of individual point
defects and visualize how the dynamics induce the well-known optical spectral
diffusion. The multi-sensor paradigm extends the quantum sensing toolbox and
offers new possibilities for structural analysis.
