Atom interferometry is a key tool for developing high-precision quantum sensors. The Kastler Brossel Laboratory is a world leader in this field. Thanks to its work on measuring recoil velocity through atomic interferometry, it has provided the most accurate determination of the fine-structure constant α. We are offering two experimental internship subjects, each of which could lead to a doctoral thesis. The first concerns the construction of a large momentum transfer beam splitter on a rubidium atom interferometer. The second subject concerns the construction of an interferometer using Ytterbium atoms