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In the last years the exploitation of specific properties of quantum stateshas 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/orresolution of measurements exploiting non-classical features such as squeezingand quantum correlations (entanglement and discordant states) [10, 11, 12, 13,14]. Nevertheless, in most of the realistic scenarios losses and noise areknown to nullify the advantage of adopting quantum strategies [15]. In thispaper we describe in detail the first experimental realization of quantumillumination protocol aimed to target detection in a noisy environment, thatpreserves a strong advantage over the classical counterparts even in presenceof large amount of noise and losses. The experiment, inspired by thetheoretical ideas elaborated in [16, 17, 18, 19] (see also [20, 21]), has beenperformed exploiting only photon number correlations in twin beams. Thus, forits simplicity it can find widespread use. Even more important by challengingthe common believe that real application of quantum technologies is limited bytheir fragility to noise and losses, it paves the way to their realapplication.

A detailed description of the experimental realisation of quantum illumination protocol