Combination of Bloch oscillations with a Ramsey-Bordé interferometer : new determination of the fine structure constant
Résumé
We report a new experimental scheme which combines atom interferometry with Bloch oscillations to provide a new measurement of the ratio $h/m_{\mathrm{Rb}}$. By using Bloch oscillations, we impart to the atoms up to $1600$ recoil momenta and thus we improve the accuracy on the recoil velocity measurement. The deduced value of $h/m_{\mathrm{Rb}}$ leads to a new determination of the fine structure constant $\alpha^{-1}=137.035\,999\,45\,(62)$ with a relative uncertainty of $4.6\times 10^{-9}$. The comparison of this result with the value deduced from the measurement of the electron anomaly provides the most stringent test of QED.
Domaines
Physique Atomique [physics.atom-ph]Origine | Fichiers produits par l'(les) auteur(s) |
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