Measurement of Local Gravity via a Cold Atom Interferometer

  • Ming-Sheng Z
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Abstract

We demonstrate a precision measurement of local gravity acceleration g in Wuhan by a compact cold
atom interferometer. The atom interferometer is in vertical Mach—Zehnder configuration realized
using a π/2 - π - π/2 Raman pulse sequence. Cold atoms were prepared in a magneto-optical trap,
launched upward to form an atom fountain, and then coherently manipulated to interfere by stimulated
Raman transition. Population signal vs Raman laser phase was recorded as interference fringes, and
the local gravity was deduced from the interference signal. We have obtained a resolution of 7 × 10
−9 g after an integration time of 236s under the best vibrational environment conditions. The
absolute g value was derived from the chirp rate with a difference of 1.5 × 10 −7 g compared to the
gravity reference value. The tidal phenomenon was observed by continuously monitoring the local
gravity over 123 h.

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Authors

  • Zhou Lin and Xiong Zong-Yuan and Yang Wei and Tang Biao and Peng Wen-Cui and Wang Yi-Bo and Xu Peng and Wang Jin and Zhan Ming-Sheng

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