Long Phase Coherence Time and Number Squeezing of two Bose-Einstein Condensates on an Atom Chip

Details Long Phase Coherence Time and Number Squeezing of two Bose-Einstein Condensates on an Atom Chip Long Phase Coherence Time and Number Squeezing of two Bose-Einstein Condensates on an Atom Chip

2006-08-27

arxiv.org/abs/cond-mat/0608585v2

Phy. Rev. Lett. 98, 030407 (2007)

Physics

Condensed Matter

Other Condensed Matter

5 pages, 5 figures

Scientific paper

10.1103/PhysRevLett.98.030407

We measured the relative phase of two Bose-Einstein condensates confined in an radio frequency induced double well potential on an atom chip. We observed phase coherence between the separated condensates for times up to 200 ms after splitting, a factor of 10 beyond the phase diffusion limit expected for a coherent state in our experimental conditions (20 ms). The enhanced coherence time is attributed to number squeezing of the initial state by a factor of 10. In addition, we demonstrated a rotationally sensitive (Sagnac) geometry for a guided atom interferometer by propagating the split condensates.

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