Quantum gravimetry

Measurement of gravity changes with atom-interferometric gravimeters, where atomic clouds are manipulated by light pulses to split and recombine. As the excited and non-excited atoms followed different paths, a phase difference is observed which is directly proportional to the gravity value.

For more information:
Ménoret, V., Vermeulen, P., Le Moigne, N. et al. Gravity measurements below 10^−9 g with a transportable absolute quantum gravimeter. Sci Rep 8, 12300 (2018). https://doi.org/10.1038/s41598-018-30608-1