Condensate Interferometry in a Magnetic Guide

We present recent progress on experiments on atom interferometry using Bose-Einstein condensates confined in a magnetic guide. Several sources of decoherence can be avoided by using a harmonic trap potential to control the motion of the the atoms, and common-mode noise sources such as vibrations can be controlled using simultaneous dual interferometers in the same trap. Important limitations that remain include anharmonicity in the trap potential and residual motion of the condensate in the trap. We will also describe a new apparatus featuring a cylindrically symmetric potential that is optimized for gyroscopic measurements.