title: Extended coherence time with atom-number squeezed states.
abstract: Coherence properties of Bose-Einstein condensates offer the potential for improved interferometric phase contrast. However, decoherence effects due to the mean-field interaction shorten the coherence time, thus limiting potential sensitivity. In this work, we demonstrate increased coherence times with number squeezed states in an optical lattice using the decay of Bloch oscillations to probe the coherence time. We extend coherence times by a factor of 2 over those expected with coherent state Bose-Einstein condensate interferometry. We observe quantitative agreement with theory both for the degree of initial number squeezing as well as for prolonged coherence times.
authors.affiliation: Physics Department, Stanford University, Stanford, California 94305, USA.
authors.forename: Wei
authors.initials: W
authors.lastname: Li
authors.forename: Ari K
authors.initials: AK
authors.lastname: Tuchman
authors.forename: Hui-Chun
authors.initials: HC
authors.lastname: Chien
authors.forename: Mark A
authors.initials: MA
authors.lastname: Kasevich