  We propose a numerical technique for modeling the quantum multimode light
scattering by a perfectly conducting body. Using the novel quantization
technique, we give the quantum adaptation of the characteristic mode approach
widely used in the classical electrodynamics. The method is universal with
respect to the body's configuration, as well as its dimensions relative to the
wavelength. Using this method and calculating the first- and the second-order
field correlation functions, we demonstrate how scattering affects
quantum-statistical features of the field. As an example, we consider
scattering of the two single-photon incident Gaussian beams on the cylinder
with circular cross-section. We show that the scattering is accompanied by the
two-photon interference and demonstrates the Hong-Ou-Mandel effect. It is
shown, that the scattered two-photon field and its correlations are able to
manifest a varying directive propagation, which is controllable by various
means (angles of incidence, configuration of the body, relations between its
sizes with the frequency). We expect that this method will be useful for
designing quantum-optical devices.
