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.
Precision Measurement of Gravity with Cold Atoms in an Optical Lattice and Comparison with a Classical Gravimeter / N. Poli; F.-Y. Wang; M. G. Tarallo; A. Alberti; M. Prevedelli; G. M. Tino. - In: PHYSICAL REVIEW LETTERS. - ISSN 0031-9007. - STAMPA. - 106:(2011), pp. 38501-1-38501-4. [10.1103/PhysRevLett.106.038501]
Precision Measurement of Gravity with Cold Atoms in an Optical Lattice and Comparison with a Classical Gravimeter
POLI, NICOLA;TINO, GUGLIELMO MARIA
2011
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.File | Dimensione | Formato | |
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