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

Abstract

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).

References in corpus (1)

• Bloch oscillations of ultracold atoms: a tool for a metrological determination of $h/m_{Rb}$

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