An Atom interferometer is an interferometer based on exploiting the wave character of atoms. Interferometers are often used to make high-precision comparisons of distances. This can be used to constrain fundamental constants like the Gravitational Constant or possibly to detect Gravitational Waves.
Read more about Atom Interferometer: Overview, Interferometer Types, History
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—Mark Twain [Samuel Langhorne Clemens] (1835–1910)