# Quantum radar

## TL;DR

This paper introduces a quantum metrology protocol using entangled photons to localize a target in 3D space with higher precision than classical methods, leveraging all spatial degrees of freedom.

## Contribution

It presents a novel quantum protocol that utilizes entangled photons for enhanced 3D localization precision, surpassing classical limits.

## Key findings

- Achieves localization uncertainty reduced by a factor of sqrt(N) compared to independent photons.
- Utilizes all spatial degrees of freedom of entangled photons for improved measurement accuracy.
- Provides a theoretical framework for quantum-enhanced target localization.

## Abstract

We propose a quantum metrology protocol for the localization of a non-cooperative point-like 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.