单电荷碱土金属离子中低角动量里德伯态寿命的异常增强
Anomalously enhanced lifetimes of low angular momentum Rydberg states in singly charged alkaline-earth metal ions
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- Institut für Theoretische Physik and Center for Integrated Quantum Science and Technology, Universität Tübingen（蒂宾根大学理论物理研究所与集成量子科学与技术中心）
- School of Physics and Astronomy and Centre for the Mathematics and Theoretical Physics of Quantum Non-Equilibrium Systems, The University of Nottingham（诺丁汉大学物理与天文学学院及量子非平衡系统数学与理论物理中心）
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中文总结 AI 辅助
本文发现单电荷碱土金属离子中某些低角动量里德伯态寿命异常增强（因子>8），零温源于偶极矩阵元相消，室温源于能级间距增大，对量子模拟与计算有重要意义。
中文摘要 AI 辅助
被囚禁离子激发到高电子态（即所谓的里德伯态）为量子模拟和量子计算开辟了新的机遇。通常，量子相干操作的保真度关键取决于里德伯态的寿命。然而，标度定律预测，单电荷碱土金属离子中里德伯态的寿命比其对应的中性原子短16倍。在这里，我们表明情况并非普遍如此。我们报告了某些低角动量离子里德伯系列的寿命异常增强，增强因子大于8。该异常在零温和有限温度下均存在，尽管其产生机制不同。在零温下，寿命的异常增强源于相关偶极跃迁矩阵元的偶然相消；而在室温下，该异常源于离子里德伯能级相对于中性原子能级的能级间距增大。
英文摘要
Trapped ions excited to high-lying electronic states, so-called Rydberg states, open new opportunities for quantum simulation and quantum computing. Generally, the fidelity of quantum coherent operations critically depends on the longevity of Rydberg states. However, scaling laws predict that the lifetimes of Rydberg states in singly charged alkaline-earth metal ions are 16 times shorter, compared to their neutral atom counterparts. Here, we show that this is not generally the case. We report an anomalous lifetime enhancement of certain low angular momentum ionic Rydberg series by factors larger than eight. The anomaly is present at both zero and finite temperature, although it is caused by different mechanisms. At zero temperature, the anomalously enhanced lifetimes are caused by accidental cancellations of the relevant dipole transition matrix elements, while at room temperature the anomaly originates from the enlarged energetic separation of ionic Rydberg levels with respect to neutral-atom levels.
