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arXiv quant-ph/9903096quant-ph
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通过多个中间态的绝热布居转移

Adiabatic population transfer via multiple intermediate states

N. V. Vitanov, S. Stenholm

摘要:

本文讨论了一种推广的受激喇曼绝热过程(STIRAP),其中单个中间态被$N$中间态所取代。这些状态中的每一个都以与泵浦脉冲成比例的耦合连接到初始状态$\state{i}$,并且以与斯托克斯脉冲成比例的耦合连接到最终状态$\state{f}$,从而形成并行的多$Λ$系统。结果表明,只有当每个泵浦耦合和相应的斯托克斯耦合之间的比率是相同的所有中间状态的暗(陷获)状态存在。我们推导出一个更一般的绝热转移态的存在条件,它包括来自中间态的瞬态贡献,但仍然在绝热极限下将粒子数从态$\state{i}$转移到态$\state{f}$。我们提出了各种数值例子的成功和失败的多$Λ$ STIRAP说明的分析预测。我们的研究结果表明,在一般情况下的任意耦合,它是最合适的泵和斯托克斯激光器的调谐或低于或高于所有的中间状态。

英文摘要:

This paper discusses a generalization of stimulated Raman adiabatic passage (STIRAP) in which the single intermediate state is replaced by $N$ intermediate states. Each of these states is connected to the initial state $\state{i}$ with a coupling proportional to the pump pulse and to the final state $\state{f}$ with a coupling proportional to the Stokes pulse, thus forming a parallel multi-$Λ$ system. It is shown that the dark (trapped) state exists only when the ratio between each pump coupling and the respective Stokes coupling is the same for all intermediate states. We derive the conditions for existence of a more general adiabatic-transfer state which includes transient contributions from the intermediate states but still transfers the population from state $\state{i}$ to state $\state{f}$ in the adiabatic limit. We present various numerical examples for success and failure of multi-$Λ$ STIRAP which illustrate the analytic predictions. Our results suggest that in the general case of arbitrary couplings, it is most appropriate to tune the pump and Stokes lasers either just below or just above all intermediate states.

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。

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