Quantum Illumination with a Parametrically Amplified Idler

TL;DR

This paper demonstrates that phase-sensitive amplification of the idler in quantum illumination enhances target detection sensitivity, outperforming classical schemes by reducing error probability using simpler detection methods.

Contribution

It introduces a novel approach of amplifying the idler mode in quantum illumination, enabling simpler detection and improved performance over classical methods.

Findings

Amplified idler enables detection with a beam splitter and photodetectors.

Quantum illumination with amplified idler has lower error probability than classical schemes.

The method simplifies the detection process while maintaining quantum advantage.

Abstract

Quantum illumination uses a quantum state of the electromagnetic field to detect the presence of a target against a bright background more sensitively than any classical state. Most often, the quantum state is a two-mode squeezed vacuum consisting of signal and idler modes with a non-zero phase-sensitive cross correlation, which serves as the signature for target detection, and a zero phase-insensitive cross correlation, which means the modes produce no fringes in second order interference. Here it is shown that applying phase-sensitive amplification to the idler modes of a two-mode squeezed vacuum results in a non-zero phase-insensitive cross correlation enabling reception by a simple beam splitter and photodetectors. It is shown that quantum illumination with a parametrically amplified idler has a lower probability of error than an asymptotically optimal classical-state scheme in discriminating between a present target and an absent target with equal prior probabilities.