title: Combination of BLOCH oscillations with a Ramsey-Bordé interferometer: new determination of the fine structure constant.
abstract: We report a new experimental scheme which combines atom interferometry with Bloch oscillations to provide a new measurement of the ratio h/mRb. 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/mRb leads to a new determination of the fine structure constant alpha(-1) =137.03599945 (62) with a relative uncertainty of 4.6 x 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.
authors.affiliation: Laboratoire Kastler Brossel, Ecole Normale Supérieure, Université Pierre et Marie Curie, CNRS, 4 place Jussieu, 75252 Paris Cedex 05, France.
authors.forename: Malo
authors.initials: M
authors.lastname: Cadoret
authors.forename: Estefania
authors.initials: E
authors.lastname: de Mirandes
authors.forename: Pierre
authors.initials: P
authors.lastname: Cladé
authors.forename: Saïda
authors.initials: S
authors.lastname: Guellati-Khélifa
authors.forename: Catherine
authors.initials: C
authors.lastname: Schwob
authors.forename: François
authors.initials: F
authors.lastname: Nez
authors.forename: Lucile
authors.initials: L
authors.lastname: Julien
authors.forename: François
authors.initials: F
authors.lastname: Biraben