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A detailed analysis of the most relevant sources of phase noise in an atomicinterferometer is carried out, both theoretically and experimentally. Even ashort interrogation time of 100 ms allows our cold atom gravimeter to reach anexcellent short term sensitivity to acceleration of $1.4\times 10^{-8}$g at 1s.This result relies on the combination of a low phase noise laser system,efficient detection scheme and good shielding from vibrations. In particular,we describe a simple and robust technique of vibration compensation, which isbased on correcting the interferometer signal by using the AC accelerationsignal measured by a low noise seismometer.

Limits to the sensitivity of a low noise compact atomic gravimeter