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We have realized an atom interferometer that probes gravitational potentialsby holding, rather than dropping, atoms. Up to one minute of coherence timesare realized by suspending the spatially separated atomic wave packets in anoptical lattice that is mode-filtered by an optical cavity. This trappedconfiguration suppresses phase variance due to vibrations by four to fiveorders of magnitude, overcoming the dominant noise source inatom-interferometric gravimeters. Recent progress in characterizing andreducing interferometer decoherence led to major increases in coherence andprecision, paving the way to measurements of dark-energy candidates and probesof the quantum nature of gravity through measuring the gravity of source masseswith record precision and spatial resolution.

Probing Gravity for one Minute with an Optical-Lattice Atom Interferometer