arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 0908.3204quant-ph
收藏

囚禁超冷气体中内态叠加的碰撞退相干

Collisional decoherence of internal state superpositions in a trapped ultracold gas

C. J. Hemming, R. V. Krems

备注：
32 pages, 2 figures. Changes for v.2: background discussion expanded; references to and discussion of related work added to and expanded; calculation of an additional quantity characterizing coherence added (Fig. 2 added in relation to this); Eq. (19) of v.1 was not correct
阅读 PDF
arXiv 页面 ↗HTML 原文 ↗

摘要：

我们分析了原子或分子在超低温下非简并内态相干叠加并置于超冷缓冲气体中的碰撞退相干。我们的分析适用于任意浴颗粒/示踪颗粒质量比。弹性碰撞和非弹性碰撞都对退相干有贡献。我们得到了一个表达式，可观察到的退相干率成对散射特性，特别是低温散射振幅。我们认为浴粒子/示踪粒子的质量比的情况下，轻浴和重示踪粒子的依赖性。得到的表达式可能是有用的，在低温应用中，需要准确的估计退相干率。结果表明，通过测量相干振荡的消相干阻尼，可以确定不同内态原子和分子的散射长度。

英文摘要：

We analyze collisional decoherence of atoms or molecules prepared in a coherent superposition of nondegenerate internal states at ultralow temperatures and placed in an ultracold buffer gas. Our analysis is applicable for an arbitrary bath particle/tracer particle mass ratio. Both elastic and inelastic collisions contribute to decoherence. We obtain an expression relating the observable decoherence rate to pairwise scattering properties, specifically the low-temperature scattering amplitudes. We consider the dependence on the bath particle/tracer particle mass ratio for the case of light bath and heavy tracer particles. The expressions obtained may be useful in low-temperature applications where accurate estimates of decoherence rates are needed. The results suggest a method for determining the scattering lengths of atoms and molecules in different internal states by measuring decoherence-induced damping of coherent oscillations.

机构、总结、中文摘要均由AI分析而来，可能存在错误，请以论文正文为准。

↑