We study spatial coherence near a classical environment by loading a Bose-Einstein condensate into a magnetic lattice potential and observing diffraction. Even very close to a surface (5 μm), and even when the surface is at room temperature, spatial coherence persists for a relatively long time ( 500 ms). In addition, the observed spatial coherence extends over several lattice sites, a significantly greater distance than the atom-surface separation. This opens the door for atomic circuits, and may help elucidate the interplay between spatial dephasing, interatomic interactions, and external noise.
|Journal||Phys. Rev. A|
|State||Published - Jun 2016|