We have built an atom interferometer that can measure g, the local acceleration due to gravity, with a resolution of Δg/g=2×10~(-8) after a single 1.3 s measurement cycle, 3×10~(-9) after 1 min and 1×10~(-10) after two days of integration time. The difference between our value for g and one obtained by a falling corner-cube optical interferometer is (7±7)×10~(-9) g. The atom interferometer uses velocity-selective stimulated Raman transitions and laser-cooled caesium atoms in an atomic fountain. We extend previous methods of analysing the interferometer to include the effects of a gravitational gradient. We also present detailed experimental and theoretical studies of potential systematic errors and noise sources.
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机译：我们构建了一个原子干涉仪，可以测量g（重力引起的局部加速度），在一个1.3 s的测量周期（3×10〜（-9））之后，分辨率为Δg/ g = 2×10〜（-8）积分2天后1分钟和1×10〜（-10）之后。我们的g值与落角立方光学干涉仪获得的g值之差为（7±7）×10〜（-9）g。原子干涉仪在原子喷泉中使用速度选择性激发的拉曼跃迁和激光冷却的铯原子。我们扩展了分析干涉仪的先前方法，以包括重力梯度的影响。我们还介绍了潜在的系统误差和噪声源的详细实验和理论研究。
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