论文标题
混合物种被困的离子链的纠缠和交感冷却的运动模式的特征
The Character of Motional Modes for Entanglement and Sympathetic Cooling of Mixed-Species Trapped Ion Chains
论文作者
论文摘要
模块化混合物种离子陷阱网络是可伸缩量子信息处理的有前途的框架，其中一个物种充当记忆量子标立，另一物种充当通信量子。该体系结构需要高保真的混合物种纠缠大门，以通过其集体运动将信息从通信转移到内存量子。我们研究了混合物种离子链的运动模式的特征，用于纠缠操作和交感神经冷却。我们发现，基于横向模式的高保真纠缠大门所需的激光功率至少比基于轴向模式高的数量级高，这两个物种的质量很大。我们还发现，即使对于中等质量差异，无论离子链配置如何，横向模式都比轴向模式更难冷却。因此，通常用于单物种离子链中操作的横向模式可能不适合具有较大质量的混合物种链。
Modular mixed-species ion-trap networks are a promising framework for scalable quantum information processing, where one species acts as a memory qubit and another as a communication qubit. This architecture requires high-fidelity mixed-species entangling gates to transfer information from communication to memory qubits through their collective motion. We investigate the character of the motional modes of a mixed-species ion chain for entangling operations and also sympathetic cooling. We find that the laser power required for high-fidelity entangling gates based on transverse modes is at least an order of magnitude higher than that based on axial modes for widely different masses of the two species. We also find that for even moderate mass differences, the transverse modes are much harder to cool than the axial modes regardless of the ion chain configuration. Therefore, transverse modes conventionally used for operations in single-species ion chains may not be well suited for mixed-species chains with widely different masses.
