A large momentum beam-spitter using Bloch oscillations

The sensitivity of an intertial sensor based on a Ramsey Bord\'e interfermometer is proportional to the velocity separation of atoms in the two arms of the interferometer. In this contribution we will describe how Bloch oscillations can be used to increase this separation using a large momentum transfer (LMT) beamsplitter. We experimentally demonstrate a separation of 10 recoil velocities. A numerical model is develloped to calculate the sensitivity of the interferometer to phase fluctuations and to intensity fluctuations. We demonstrate that the later can be significantly decreased by using a suitable combination of LMT pulses. We finally show how one can further increase the separation.