# Quantum Radar.

@article{Maccone2020QuantumR, title={Quantum Radar.}, author={Lorenzo Maccone and Changliang Ren}, journal={Physical review letters}, year={2020}, volume={124 20}, pages={ 200503 } }

We propose a quantum metrology protocol for the localization of a noncooperative pointlike target in three-dimensional space, by illuminating it with electromagnetic waves. It employs all the spatial degrees of freedom of N entangled photons to achieve an uncertainty in localization that is sqrt[N] times smaller for each spatial direction than what could be achieved by N-independent photons or by classical light of the same average intensity.

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