



@article {1836,
	title = {Optimal and Secure Measurement Protocols for Quantum Sensor Networks},
	year = {2018},
	month = {2018/03/23},
	abstract = {<p>Studies of quantum metrology have shown that the use of many-body entangled states can lead to an enhancement in sensitivity when compared to product states. In this paper, we quantify the metrological advantage of entanglement in a setting where the quantity to be measured is a linear function of parameters coupled to each qubit individually. We first generalize the Heisenberg limit to the measurement of non-local observables in a quantum network, deriving a bound based on the multi-parameter quantum Fisher information. We then propose a protocol that can make use of GHZ states or spin-squeezed states, and show that in the case of GHZ states the procedure is optimal, i.e., it saturates our bound.</p>},
	doi = {https://doi.org/10.1103/PhysRevA.97.042337},
	url = {http://arxiv.org/abs/1607.04646},
	author = {Zachary Eldredge and Michael Foss-Feig and Steven L. Rolston and Alexey V. Gorshkov}
}
