微片多段离子阱中的边带冷却和相干动力学
Sideband cooling and coherent dynamics in a microchip multi-segmented ion trap
摘要：
具有多个阱段的小型化离子阱阵列为可扩展的量子信息处理提供了有前途的架构。分段线性Paul阱的小型化允许将微阱划分在不同的存储和处理区中。通过外部陷阱控制电压对许多离子进行单独的位置控制-每个离子在其长寿命的电子能级中携带量子比特信息-对于下一代大规模量子算法的实现非常重要。我们提出了一种新型的可扩展的微芯片多段离子阱，其具有两个不同的相邻区域，一个用于存储，另一个专用于使用单离子和线性离子晶体处理量子信息：一对收音机-频率驱动的电极和62个独立控制的DC电极允许单个离子或线性离子晶体在轴向和径向阱频率为几MHz。利用边带光谱对<->40 Ca+离子的S1/2D 5/2窄量子比特跃迁进行了表征和优化，演示了相干单量子比特拉比旋转和光学冷却方法。我们确定加热率使用边带冷却测量振动基态，这是必要的后续两个量子比特的量子逻辑操作。证明了可扩展的量子信息处理的适用性。
英文摘要：
Miniaturized ion trap arrays with many trap segments present a promising architecture for scalable quantum information processing. The miniaturization of segmented linear Paul traps allows partitioning the microtrap in different storage and processing zones. The individual position control of many ions - each of them carrying qubit information in its long-lived electronic levels - by the external trap control voltages is important for the implementation of next generation large-scale quantum algorithms. We present a novel scalable microchip multi-segmented ion trap with two different adjacent zones, one for the storage and another dedicated for the processing of quantum information using single ions and linear ion crystals: A pair of radio-frequency driven electrodes and 62 independently controlled DC electrodes allows shuttling of single ions or linear ion crystals with numerically designed axial potentials at axial and radial trap frequencies of a few MHz. We characterize and optimize the microtrap using sideband spectroscopy on the narrow S1/2 <-> D5/2 qubit transition of the 40Ca+ ion, demonstrate coherent single qubit Rabi rotations and optical cooling methods. We determine the heating rate using sideband cooling measurements to the vibrational ground state which is necessary for subsequent two-qubit quantum logic operations. The applicability for scalable quantum information processing is proven.
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