Extended Coherence Time with Atom-Number Squeezed States
Wei LiPhysics Department, Stanford University, Stanford, California 94305, USAA. K. TuchmanPhysics Department, Stanford University, Stanford, California 94305, USAHui-Chun ChienPhysics Department, Stanford University, Stanford, California 94305, USAMark A. KasevichPhysics Department, Stanford University, Stanford, California 94305, USA
2007en
ABI
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.
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Cited by 20 references