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arXiv 0904.2121cond-mat.quant-gas
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原子与分子玻色-爱因斯坦凝聚体之间的快速相扩散

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

I. Tikhonenkov, A. Vardi

摘要:

研究了分子玻色-爱因斯坦凝聚体中一小部分相干解离成原子后原子-分子相干的碰撞损失。所得到的$n$ -原子态是两原子(SU(1,1))相干态,与原子凝聚体相干分裂形成的自旋(SU(2))相干态的$Δn\propto \sqrt{n}$相比,$n$ -原子态具有数方差$Δn\propto n$.因此,洛伦兹原子-分子相扩散比分离的原子凝聚体之间的高斯相扩散快$\sqrt{n}$因子。

英文摘要:

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 $Δn\propto n$ compared to $Δn\propto \sqrt{n}$ 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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