BEC 1 is concerned with trapped matterwave interferometry either in the fully trapped regime or in matterwave guides. We have recently demonstrated the first guiding of matterwaves over macroscopic distances without affecting the internal coherence of the Bose-Einstein Condensates (BEC), i.e. to guide them without any heating or atom-loss.
We have recently managed to demonstrate the first fully coherent waveguides (published in Nature).
One possible version of the interferometer (trapped clock interferometer) is described here.