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Precision measurement of gravity with cold atoms in an optical lattice and comparison with a classical gravimeter

Precision measurement of gravity with cold atoms in an optical lattice and comparison with a classical gravimeter

Physical Review Letters 106(3): 038501

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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Accession: 055094799

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PMID: 21405305

DOI: 10.1103/physrevlett.106.038501

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