Enhancement in the mean square range delay accuracy by means of multiple entangled photon states quantum illumination

TL;DR

This paper demonstrates that using multiple entangled photon states in quantum illumination significantly improves range-delay measurement accuracy and reduces integration time compared to traditional protocols, enhancing radar system performance.

Contribution

It introduces a generalized quantum illumination protocol with two-photon entangled states that outperforms Lloyd's protocol in error probability, integration time, and measurement precision.

Findings

Reduced error probability compared to Lloyd's protocol

Decreased integration time for range-delay evaluation

Enhanced accuracy in range-delay measurements

Abstract

It has been discussed recently how quantum illumination can be used to increase the accuracy of the value range-delay measurement \cite{Zhuang Shapiro 2022} in the domain of SNR compatible with current radar systems. However, the advantage described in [1] requires of a large integration time. In this work it is argued that multiple entangled photon quantum illumination could help to reduce the integration time when evaluating range-delay. Our analysis is performed in the framework of three entangled photon states discrete quantum illumination protocols. In this setting it is shown explicitly that using a direct generalization of Lloyd's protocol to the case where signal states describe two photons presents interesting advantages: 1. The reduction of the probability of error with respect to Lloyd's quantum illumination, 2. The reduction of the integration time with respect to Lloyd's quantum illumination, 3. The increase in the ultimate in the measurement of the range-delay accuracy.