Combination of Bloch oscillations with a Ramsey-Bord\'e interferometer :   new determination of the fine structure constant
  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. 
Malo Cadoret (LKB - Jussieu), Estefania De Mirandes (LKB - Jussieu),   Pierre Clad\'e (LKB - Jussieu), Sa\"ida Guellati-Kh\'...