We thank the referee for pointing out this additional reference and have added it to the references.
In the Introduction, quite a lot of papers are cited concerning the applications of atom interferometer in varies fields. Just for the note of the authors, there are some new applications of atom interferometer, e.g., in the accurate measurement of the quadratic Zeeman coefficient [J. Phys. B: At. Mol. Opt. Phys., 47(1): 015001, 2014].