A detailed description of the experimental realisation of quantum illumination protocol

Abstract

In the last years the exploitation of specific properties of quantum states has disclosed the possibility of realising tasks beyond classical limits, creating the new field of quantum technologies [1, 2, 3, 4, 5, 6, 7, 8, 9]. Among them, quantum metrology and imaging aim to improve the sensitivity and/or resolution of measurements exploiting non-classical features such as squeezing and quantum correlations (entanglement and discordant states) [10, 11, 12, 13, 14]. Nevertheless, in most of the realistic scenarios losses and noise are known to nullify the advantage of adopting quantum strategies [15]. In this paper we describe in detail the first experimental realization of quantum illumination protocol aimed to target detection in a noisy environment, that preserves a strong advantage over the classical counterparts even in presence of large amount of noise and losses. The experiment, inspired by the theoretical ideas elaborated in [16, 17, 18, 19] (see also [20, 21]), has been performed exploiting only photon number correlations in twin beams. Thus, for its simplicity it can find widespread use. Even more important by challenging the common believe that real application of quantum technologies is limited by their fragility to noise and losses, it paves the way to their real application.

arXiv admin note: substantial text overlap with arXiv:1303.4304

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• Real applications of quantum imaging
• Photon number correlation for quantum enhanced imaging and sensing
• Nonclassical Light and Metrological Power: An Introductory Review
• The minimum error probability of quantum illumination
• Quantifying the source of enhancement in experimental continuous variable quantum illumination
• Quantum illumination using polarization-path entangled single photons for low reflectivity object detection in noisy background
• Quantum illumination using polarization-entangled photon pairs for enhanced object detection
• Detection of the Quantum Illumination Measurement