论文标题
快速多Qubit的全球范围内的大门，而无需捕获离子的个人处理
Fast multi-qubit global-entangling gates without individual addressing of trapped ions
论文作者
论文摘要
我们提出和研究以高保真度的纠缠离子系统中的纠缠操作加速的方式。首先，我们找到了一个方案，可以提高双度门的速度而不限制陷阱频率，这被认为是基本限制。其次，我们研究了快速门方案，用于同时纠缠两个量子位。我们应用在激光束上应用多个频率组件进行门操作的方法。特别是，为了避免从耦合到载体过渡的无限术语，我们重点介绍了相位不敏感的门方案。我们仔细研究了运动模式对羔羊 - 二克近似极限的大量激发的影响，包括羔羊 - 二十多克参数的二阶项。我们研究了无单独解决要求的多Qubit Global纠缠大门的速度限制。此外，我们的门可能对初始运动阶段的波动不敏感，这些阶段在相位不敏感的栅极方案中很难稳定。
We propose and study ways speeding up of the entangling operations in the trapped ions system with high fidelity. First, we find a scheme to increase the speed of a two-qubit gate without the limitation of trap frequency, which was considered as the fundamental limit. Second, we study the fast gate scheme for entangling more than two qubits simultaneously. We apply the method of applying multiple frequency components on laser beams for the gate operations. In particular, in order to avoid infinite terms from the coupling to carrier transition, we focus on the phase-insensitive gate scheme here. We carefully study the effect of large excitation of motional mode beyond the limit of Lamb-Dicke approximation by including up to second order terms of the Lamb-Dicke parameter. We study the speed limit of multi-qubit global entangling gates without individual addressing requirements. Furthermore, our gates can be made insensitive to the fluctuation of initial motional phases which are difficult to stabilise in the phase-insensitive gate scheme.
