The closed-form expressions of a monostatic quantum radar cross-section (QRCS) for a cuboid under illumination from single photon pulses have been successfully derived. An omnidirectional three-dimensional image of the QRCS is given for the first time using the derived expressions. The simulation results for the expressions are consistent with the numerical calculations, which validate the expressions. The simulation results indicate that the QRCS may have a new slumping effect of different degrees near the special visual angle. The slumping effect means that when the irradiation direction of photon pulses deviates from the vertical direction of the cuboid panel, the QRCS in the main lobe direction drops significantly. We then use the expressions to determine the quantitative relationship between the observed slumping effect and the number of illuminated atoms. In addition, the quantum effect is suppressed (amplified) on the electrically large (small) panel side. This new slumping effect provides good design concepts for quantum stealth aircraft.
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