Atom Interferometer Measurement of the Newtonian Constant of Gravity
Abstract
We measured the Newtonian constant of gravity, G, using a gravity gradiometer based on atom interferometry. The gradiometer measures the differential acceleration of two samples of lasercooled Cs atoms. The change in gravitational field along one dimension is measured when a wellcharacterized Pb mass is displaced. Here, we report a value of G = 6.693 × 10^{11} cubic meters per kilogram second squared, with a standard error of the mean of ±0.027 × 10^{11} and a systematic error of ±0.021 × 10^{11} cubic meters per kilogram second squared. The possibility that unknown systematic errors still exist in traditional measurements makes it important to measure G with independent methods.
 Publication:

Science
 Pub Date:
 January 2007
 DOI:
 10.1126/science.1135459
 Bibcode:
 2007Sci...315...74F