When searching for buried treasure, a quantum gravity sensor may be your best bet.
, such as Newton’s gravitational constant . But atom-based gravity sensors are highly sensitive to vibrations from seismic activity, traffic and other sources.
Holynski’s team solved that problem by building a gravity sensor with not one but two falling clouds of rubidium atoms. With one cloud suspended a meter above the other, the instrument could gauge the strength of gravity at two different heights in a single location. Comparing those measurements allowed the researchers to cancel out the effects of background noise.
Based on the machine’s sensitivity in this experiment, it could probably provide a reliable gravity measurement at each location in less than two minutes, the researchers estimate. That’s about one-tenth the time needed for other types of gravity sensors.
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