Quantum metrology with a trapped atom interferometer interrogated for one minute

Precise control of quantum states allows atom interferometers to explore fundamental physics and perform inertial sensing. For atomic fountain interferometers, the measurement time is limited by the available free-fall time in meters-long apparatus to a few seconds. We instead realize atom interferometry with a coherent spatial superposition state held by an optical lattice for longer than 1 minute, more than 25 times longer than any atomic fountain interferometer. This performance was made possible by recent advances in the understanding and control of coherence-limiting mechanisms. An order of magnitude increase in sensitivity enables near-term applications such as gravimetry measurements, searches for fifth forces, or fundamental probes into the non-classical nature of gravity.