Optimal squeezing for quantum target detection

Abstract

It is not clear if the performance of a quantum lidar or radar, without an idler and only using Gaussian resources, could exceed the performance of a semiclassical setup based on coherent states and homodyne detection. Here we prove this is indeed the case by showing that an idler-free squeezed-based setup can beat this semiclassical benchmark. More generally, we show that probes whose displacement and squeezing are jointly optimized can strictly outperform coherent states with the same mean number of input photons for both the problems of quantum illumination and reading.

Second revision. Accepted in Physical Review Research

References in corpus (7)

• Quantum Illumination with Gaussian States
• Microwave Quantum Illumination
• Quantum Illumination at the Microwave Wavelengths
• Experimental realisation of quantum illumination
• Limits and Security of Free-Space Quantum Communications
• Quantum Illumination with a generic Gaussian source
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Cited by in corpus (1)

• Bound for Gaussian-state Quantum illumination using direct photon measurement