A new determination of the fine structure constant based on Bloch oscillations of ultracold atoms in a vertical optical lattic

Details A new determination of the fine structure constant based on Bloch oscillations of ultracold atoms in a vertical optical lattic A new determination of the fine structure constant based on Bloch oscillations of ultracold atoms in a vertical optical lattic

2005-10-11

arxiv.org/abs/physics/0510101v2

Physical Review Letters 96 (2006) 033001

Physics

Atomic Physics

Scientific paper

10.1103/PhysRevLett.96.033001

We report an accurate measurement of the recoil velocity of Rb atoms based on Bloch oscillations in a vertical accelerated optical lattice. We transfer about 900 recoil momenta with an efficiency of 99.97 % per recoil. A set of 72 measurements of the recoil velocity, each one with a relative uncertainty of about 33 ppb in 20 min integration time, leads to a determination of the fine structure constant alpha with a statistical relative uncertainty of 4.4 ppb. The detailed analysis of the different systematic errors yields to a relative uncertainty of 6.7 ppb. The deduced value of 1/alpha is 137.03599878(91).

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