Combination of Bloch Oscillations with a Ramsey-Borde Interferometer: New Determination of the Fine Structure Constant
Combination of Bloch Oscillations with a Ramsey-Borde Interferometer: New Determination of the Fine Structure Constant
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DOI：
10.1103/physrevlett.101.230801
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发表时间：
2008-12-05
影响因子：
8.6
通讯作者：
Biraben, Francois
中科院分区：
文献类型：
--
作者：
Cadoret, Malo;de Mirandes, Estefania;Biraben, Francois
我们报告了一个新的实验方案，结合原子干涉与布洛赫振荡提供一个新的测量比h/m（Rb）。利用布洛赫振荡，我们赋予原子高达1600的反冲动量，从而提高了反冲速度测量的精度。由h/m（Rb）值重新确定了精细结构常数α（-1）= 137.03599945（62），相对不确定度为4.6 × 10 ~（-9）。这个结果与从电子反常测量中推导出的值的比较提供了对QED最严格的检验。
We report a new experimental scheme which combines atom interferometry with Bloch oscillations to provide a new measurement of the ratio h/m(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(Rb) leads to a new determination of the fine structure constant alpha(-1)=137.035 999 45 (62) with a relative uncertainty of 4.6x10(-9). The comparison of this result with the value deduced from the measurement of the electron anomaly provides the most stringent test of QED.