Entanglement-assisted multi-aperture pulse-compression radar for angle resolving detection

TL;DR

This paper introduces a quantum radar scheme using entangled microwave pulses with dual receivers to enhance angle resolution of distant objects, showing significant improvements over classical methods in short-range, high-frequency scenarios.

Contribution

It proposes a novel entanglement-assisted multi-aperture radar method for angle detection, extending quantum advantages beyond range estimation.

Findings

Entanglement improves angle resolution significantly.

The scheme is effective in short-range, high-frequency applications.

Quantum radar outperforms classical counterparts under similar conditions.

Abstract

Entanglement has been known to boost target detection, despite it being destroyed by lossy-noisy propagation. Recently, [Phys. Rev. Lett. 128, 010501 (2022)] proposed a quantum pulse-compression radar to extend entanglement's benefit to target range estimation. In a radar application, many other aspects of the target are of interest, including angle, velocity and cross section. In this study, we propose a dual-receiver radar scheme that employs a high time-bandwidth product microwave pulse entangled with a pre-shared reference signal available at the receiver, to investigate the direction of a distant object and show that the direction-resolving capability is significantly improved by entanglement, compared to its classical counterpart under the same parameter settings. We identify the applicable scenario of this quantum radar to be short-range and high-frequency, which enables entanglement's benefit in a reasonable integration time.