Ultracold molecules for quantum simulation: rotational coherences in CaF and RbCs
Ultracold molecules for quantum simulation: rotational coherences in CaF and RbCs
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DOI：
10.1088/2058-9565/aaee35
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发表时间：
2019-01-01
影响因子：
6.7
通讯作者：
Cornish, Simon L.
中科院分区：
文献类型：
--
作者：
Blackmore, Jacob A.;Caldwell, Luke;Cornish, Simon L.
极性分子基于电偶极矩之间的静电相互作用，为长程相互作用体系的量子模拟提供了一个新的平台。在这里，我们报告的发展相干量子态控制使用微波场在（CaF）-Ca-40-F-19和（RbCs）-Rb-87-Cs-133分子，许多量子模拟应用的关键成分。我们进行拉姆齐干涉测量与条纹间距类似1 kHz和调查的失相时间的叠加N = 0和N = 1的旋转状态时，分子被限制。对于这两个分子，我们表明，明智的选择分子超精细状态的空间变化的过渡频率的影响最小化跨越陷阱。对于磁俘获的（CaF）-Ca-40-F-19，我们使用磁不敏感跃迁并观察到0.61（3）ms的相干时间。对于光俘获的（RbCs）-Rb-87-Cs-133，我们利用AC斯塔克位移中避免的交叉并观察到0.75（6）ms的最大相干时间。
Polar molecules offer a new platform for quantum simulation of systems with long-range interactions, based on the electrostatic interaction between their electric dipole moments. Here, we report the development of coherent quantum state control using microwave fields in (CaF)-Ca-40-F-19 and (RbCs)-Rb-87-Cs-133 molecules, a crucial ingredient for many quantum simulation applications. We perform Ramsey interferometry measurements with fringe spacings of similar to 1 kHz and investigate the dephasing time of a superposition of N = 0 and N = 1 rotational states when the molecules are confined. For both molecules, we show that a judicious choice of molecular hyperfine states minimises the impact of spatially varying transition-frequency shifts across the trap. For magnetically trapped (CaF)-Ca-40-F-19 we use a magnetically insensitive transition and observe a coherence time of 0.61(3) ms. For optically trapped (RbCs)-Rb-87-Cs-133 we exploit an avoided crossing in the AC Stark shifts and observe a maximum coherence time of 0.75(6) ms.