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arXiv 2009.01944cond-mat.quant-gasphysics.atom-ph
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多微波场对超冷$^{87}$ Rb $^{133}$ Cs分子内态的相干操纵

Coherent Manipulation of the Internal State of Ultracold $^{87}$Rb$^{133}$Cs Molecules with Multiple Microwave Fields

Jacob A. Blackmore, Philip D. Gregory, Sarah L. Bromley, Simon L. Cornish

摘要:

我们利用三能级的转动态和超精细态的λ和梯形组态研究了$^{87}$ Rb $^{133}$ Cs分子中的相干多光子过程,并讨论了它们与量子计算和量子模拟未来应用的相关性.在λ组态中,我们证明了通过双光子喇曼跃迁在转动基态的两个超精细能级之间驱动布居。这样的状态对可能会在未来被用作量子存储器,我们测量的拉姆齐相干时间为58(9)ms的叠加这些状态的梯形配置,我们表明,我们可以生成和相干填充微波修饰状态通过观察一个Autler-Townes双峰。我们证明,我们可以通过改变微波耦合场的强度来控制这种敷料的强度。最后,我们进行光谱的旋转状态的$^{87}$ Rb $^{133}$ Cs到$N=6$,突出了潜在的超冷分子的量子模拟在合成维度。通过拟合测得的过渡频率,我们确定了离心畸变系数的新值$D_v=h\times207.3(2)~$ Hz。

英文摘要:

We explore coherent multi-photon processes in $^{87}$Rb$^{133}$Cs molecules using 3-level lambda and ladder configurations of rotational and hyperfine states, and discuss their relevance to future applications in quantum computation and quantum simulation. In the lambda configuration, we demonstrate the driving of population between two hyperfine levels of the rotational ground state via a two-photon Raman transition. Such pairs of states may be used in the future as a quantum memory, and we measure a Ramsey coherence time for a superposition of these states of 58(9) ms. In the ladder configuration, we show that we can generate and coherently populate microwave dressed states via the observation of an Autler-Townes doublet. We demonstrate that we can control the strength of this dressing by varying the intensity of the microwave coupling field. Finally, we perform spectroscopy of the rotational states of $^{87}$Rb$^{133}$Cs up to $N=6$, highlighting the potential of ultracold molecules for quantum simulation in synthetic dimensions. By fitting the measured transition frequencies we determine a new value of the centrifugal distortion coefficient $D_v=h\times207.3(2)~$Hz.

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