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  • Combination of Bloch oscillations with a Ramsey-Bordé interferometer : new determination of the fine structure constant
    Malo Cadoret; De Mirandes, Estefania; Cladé, Pierre; Guellati-Khélifa, Saïda; Schwob, Catherine; Nez, François; Julien, Lucile; Biraben, François

    arXiv.org, 10/2008
    Paper

    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.

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