Introduction to quantum radar

TL;DR

This paper reviews the principles, schemes, and challenges of quantum radar technology, focusing on quantum entanglement and correlations, and assesses the feasibility of various quantum sensing protocols for radar applications.

Contribution

It provides an up-to-date, accessible review of quantum radar concepts, including implementation difficulties and case-by-case feasibility assessments.

Findings

Quantum illumination protocols show promise for radar detection.

Implementation challenges remain significant for practical quantum radar.

The review highlights the feasibility of different quantum sensing schemes.

Abstract

After a brief introduction to the notion of quantum entanglement and quantum correlations, several schemes for a quantum radar based upon the quantum illumination and others protocols are discussed. We review different concepts that have been introduced to overcome several of the inherent difficulties in the implementation of quantum generation and/or detection quantum sensing protocols for RADAR applications. Our review is an up-to date critical presentation of the state of the art, with emphasis in the case by case assessment of the feasibility of the different concepts. We also aim that the review is accessible to non-experts in the field. Hence several appendixes and a technical glossary are included.