论文标题
连贯的运动状态中的rydberg离子：确定Rydberg离子极化性的新方法
Rydberg ions in coherent motional states: A new method for determining the polarizability of Rydberg ions
论文作者
论文摘要
我们提出了一种测量Rydberg离子限制在保罗陷阱的谐波潜力的方法。对于高度激发的电子状态，电子波函数和捕获场之间的耦合会根据离子的运动状态修饰激发概率。这种相互作用在很大程度上取决于激发态的极化性，并在离子的状态依赖性世俗频率中表现出来。我们初始化一个单个被困的$^{40} $ ca $^+$离子从动作基态到连贯的状态，$ |α| $最高12个使用陷阱段上的电压。内部状态首先在长寿的3D $ _ {5/2} $状态下初始化，对Rydberg S $ _ {1/2} $ - 通过5p $ _ {3/2} $状态在两光顿进程中进行了兴奋。我们探测3D $ _ {5/2} $状态的耗竭，这是由于Rydberg激发的，然后将衰减到内部地面4S $ _ {1/2} $状态。通过分析获得的光谱，我们提取了与数值计算相一致的Rydberg状态的极化。该方法是易于实现的，不论其主量子数如何，都适用于不同的Rydberg状态。 rydberg离子晶体的量子门操作需要状态极化的准确值。
We present a method for measuring the polarizability of Rydberg ions confined in the harmonic potential of a Paul trap. For a highly excited electronic state, the coupling between the electronic wave function and the trapping field modifies the excitation probability depending on the motional state of the ion. This interaction strongly depends on the polarizability of the excited state and manifests itself in the state-dependent secular frequencies of the ion. We initialize a single trapped $^{40}$Ca$^+$ ion from the motional ground state into coherent states with $|α|$ up to 12 using electric voltages on the trap segments. The internal state, firstly initialised in the long-lived 3D$_{5/2}$ state, is excited to a Rydberg S$_{1/2}$-state via the 5P$_{3/2}$ state in a two-photon process. We probe the depletion of the 3D$_{5/2}$ state owing to the Rydberg excitation followed by a decay into the internal ground 4S$_{1/2}$ state. By analysing the obtained spectra we extract the polarizability of Rydberg states which agree with numerical calculations. The method is easy-to-implement and applicable to different Rydberg states regardless of their principal or angular quantum numbers. An accurate value of the state polarizability is needed for quantum gate operations with Rydberg ion crystals.
