Precision measurement of gravity with cold atoms in an optical lattice and comparison with a classical gravimeter |
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Authors: | Poli N Wang F-Y Tarallo M G Alberti A Prevedelli M Tino G M |
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Affiliation: | Dipartimento di Fisica e Astronomia and LENS, Università di Firenze and INFN Sezione di Firenze, Via Sansone 1, 50019 Sesto Fiorentino, Italy. |
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Abstract: | We report on a precision measurement of gravitational acceleration using ultracold strontium atoms confined in an amplitude-modulated vertical optical lattice. An uncertainty Δg/g ≈ 10(-7) is reached by measuring at the 5th harmonic of the Bloch frequency. The value obtained with this microscopic quantum system is consistent with the one measured with a classical gravimeter. Using lattice modulation to prepare the atomic sample, we also achieve high visibility of Bloch oscillations for ~ 20 s. These results can be of relevance for testing gravitational redshift and Newtonian law at micrometer scale. |
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