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Atomic Kapitza-Dirac (KD) scattering in the classical standing wave of lightsis widely used to make the laser-pulsed atom interferometers. In thistheoretical work, we show that the dielectric nanoparticle can be used as aweak light source to generate atomic KD scattering and make atominterferometer. We consider a cavity system consisting of atoms and a singlenanoparticle, where the nanoparticle is illuminated by the external laserpulses. Atoms and the cavity mirrors are not illuminated by the laser beam, sonanoparticle acts as a pulsed source to excite the cavity mode whichnon-resonantly excites atomic internal state and generates a weak KD scatteringof atomic external motion. We use twice such scattering to split atomic pathand consequently use two classical laser pulses to recombine the separatedpaths for generating the Ramsey-Bord\'{e} atom interferometer. This atominterferometer is entangled with the centre-of-mass motion of nanoparticle andcould be developed to search the small nonclassicality of motionalnanoparticle, because the cavity mode excitation is associated withnanoparticle's position relative to the node or antinode of that optical mode.

Nanoparticle acts as a light source to make atom interferometers