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Robust quantum spatial coherence near a classical environment
Shuyu Zhou [1] , David Groswasser [1] , Mark Keil [1] , Yonathan Japha [1] , Ron Folman [1]
[1] Department of Physics, Ben-Gurion University of the Negev, Be'er Sheva 84105, Israel
We study spatial coherence near a classical environment by loading a Bose-Einstein condensate into a magnetic lattice potential and observing coherent diffraction. Even very close to a surface (5μm), and even when the surface is at room temperature, spatial coherence persists for a relatively long time (≥500ms). In addition, the spatial coherence extends over several lattice sites, much farther than the atom-surface separation. This opens the door for atomic circuits, and may help elucidate the interplay between spatial dephasing, inter-atomic interactions, and external noise.