Rapid phase-diffusion between atomic and molecular Bose-Einstein condensates

Details Rapid phase-diffusion between atomic and molecular Bose-Einstein condensates Rapid phase-diffusion between atomic and molecular Bose-Einstein condensates

2009-04-14

arxiv.org/abs/0904.2121v1

Phys. Rev. A 80, 051604(R) (2009)

Physics

Condensed Matter

Quantum Gases

4 pages, 3 figures

Scientific paper

We study the collisional loss of atom-molecule coherence after coherently dissociating a small fraction of a molecular Bose-Einstein condensate into atoms. The obtained $n$-atoms states are two-atom (SU(1,1)) coherent states with number variance $\Delta n\propto n$ compared to $\Delta n\propto \sqrt{n}$ for the spin (SU(2)) coherent states formed by coherent splitting of an atomic condensate. Consequently, the Lorentzian atom-molecule phase-diffusion is faster than the Gaussian phase-diffusion between separated atomic condensates, by a $\sqrt{n}$ factor.

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