Fig. 3. Performance of the quantum and classical noise radars in terms of the cross-correlation coefficient. (Upper) The cross-correlation coefficients for the quantum and classical noise radars, as functions of the transmitted quanta, rescaled such that √ η = 1. (Lower) The quantum advantage for the cases considered above. In both plots, we have considered the ξ = 10−3 and ξ = 0.5 settings. The first setting achieves a close to optimal cross-correlation coefficient. The second setting is suboptimal, and it has been used as classical reference in recent microwave illumination experiments [12], [13].
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