Qu&Co comments on this publication:

Quantum sensing and metrology may benefit from a spatially distributed network architecture employing entangled states and measurements to enhance precision. Given the challenges faced in the creation and manipulation of entangled states, a complete understanding of when entanglement is (and is not) critical to optimizing estimation precision is importance. In this paper, Proctor et al. introduce a general model for a network of quantum sensors, and use this model to determine whether precision enhancement can be achieved in a range of practical applications.