Mini G: a simple, precise, and versatile atom interferometer

Gravimeters have been successfully applied for metrology, geology, and geophysics. Atomic gravimeters based on atom interferometry are more accurate and have better long-term stability. Additionaly, mobile atom interferometers with the ability of multiaxis inertial sensing would open up applications in inertial navigation. However, current atom interferometers are too complicated to operate in a miniature package or under field conditions.

In this project, we are developing a mobile atom interferometer using a single-diode laser system and a pyramidal magneto-optical trap. As our first demonstration of field operation, we drove the atom inteferometer around the Berkeley Hills and measured gravity. Our results show that one should feel lighter by 0.1‰, driving from the base to the peak of the hills.

We have more ideas about applying minig to geodesy, geophysics, metrolgoy, or navigation. Come to visit us if you like doing physics in the sunset!

Team members

Xuejian Wu

Zachary Pagel

Bola Malek

Yuanhang Yang

Yanyan Zhu

Past Team menbers

Timothy Nguyen

Jordan Dubley

Philip Canoza

Fei Zi

Ryan J. Bilotta


  1. Gravity surveys using a mobile atom interferometer. Xuejian Wu, Zachary Pagel, Bola S. Malek, Timothy H. Nguyen, Fei Zi, Daniel S. Scheirer, and Holger Müller. arXiv:1904.09084 (2019).
  2. Multiaxis atom interferometry with a single-diode laser and a pyramidal magneto-optical trap. Xuejian Wu, Fei Zi, Jordan Dudley, Ryan J. Bilotta, Philip Canoza, and Holger Müller, Optica 4(12),1545-1551 (2017) and arXiv:1707.08693.