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Atom interferometers using Bose-Einstein condensate that is confined in awaveguide and manipulated by optical pulses have been limited by their shortcoherence times. We present a theoretical model that offers a physically simpleexplanation for the loss of contrast and propose the method for increasing thefringe contrast by recombining the atoms at a different time. A simple,quantitatively accurate, analytical expression for the optimized recombinationtime is presented and used to place limits on the physical parameters for whichthe contrast may be recovered.Comment: 34 Pages, 8 Figure

Increasing the coherence time of Bose-Einstein-condensate interferometers with optical control of dynamics