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In Situ Measurement of Vacuum Window Birefringence using 25Mg+ Fluorescence
Published on: June 13, 2020
Precision measurement of gravity with cold atoms in an optical lattice and comparison with a classical gravimeter
N Poli1, F-Y Wang, M G Tarallo
1Dipartimento di Fisica e Astronomia and LENS, Università di Firenze and INFN Sezione di Firenze, Via Sansone 1, 50019 Sesto Fiorentino, Italy.
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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