Atom interferometry is a precision measurement technique that exploits the wave nature of neutral atoms or atomic ensembles to form interference patterns analogous to optical interferometers. It typically uses sequences of laser pulses or material gratings to coherently split, redirect, and recombine atomic wave packets along spatially separated paths, encoding phase shifts induced by external fields or inertial effects. By measuring population differences in internal or momentum states at the output ports, atom interferometers sensitively probe gravitational acceleration, rotation, fundamental constants, and weak forces, with performance governed by coherence time, interrogation length, atomic species, and control of systematic phase noise.
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