Full elimination of the gravity-gradient terms in atom interferometry

The A. Roura technique was modified to eliminate all terms in the atom interferometer phase, which are linear in the gravity-gradient tensor. The full elimination occurs if all effective wave vectors are slightly changed. The full elimination technique would allow to relieve the synchronization requirements in the test of the Einstein equivalence principle. This technique also eliminates the error of the absolute gravity measurement associated with the gravity gradient terms. The error becomes three orders smaller and does not depend on the time delay between the Raman pulses. In addition, the new differential scheme is proposed to observe the gravity-gradient term independent on the atoms initial position and velocity.