论文标题
多-GHZ重复率，多瓦平均功率，快速捕获离子纠缠操作的紫外线激光脉冲
Multi-GHz repetition rate, multi-watt average power, ultraviolet laser pulses for fast trapped-ion entanglement operations
论文作者
论文摘要
在被困离子中执行两分门操作的常规方法依赖于激光灯光的激光侧带上的离子，这是一个固有的缓慢过程。实施快速纠缠的门协议的一种方法需要合适的脉冲激光器以通过数量级来提高门速度。但是，这种快速纠缠的门操作的实现提出了一个巨大的技术挑战，因此所需的激光源无法实现。为此，我们根据频率梳子设计了超快的纠缠栅极源。该源在393.3 nm处以5 GHz重复率以脉冲能量$ \ sim $ 800 PJ生成数百个模式锁定的脉冲$ \ sim $ 800 pj，并且符合实施快速两倍的栅极操作的所有要求。使用单个the鼠的紫外脉冲，我们在Ca $^+$ ion中证明了快速绝热通道。为了验证激光系统用于诱导纠缠大门的适用性和投影性能，我们基于源参数运行模拟。门时间可以比陷阱期更快，而错误接近$ 10^{ - 4} $。
The conventional approach to perform two-qubit gate operations in trapped ions relies on exciting the ions on motional sidebands with laser light, which is an inherently slow process. One way to implement a fast entangling gate protocol requires a suitable pulsed laser to increase the gate speed by orders of magnitude. However, the realization of such a fast entangling gate operation presents a big technical challenge, as such the required laser source is not available off-the-shelf. For this, we have engineered an ultrafast entangling gate source based on a frequency comb. The source generates bursts of several hundred mode-locked pulses with pulse energy $\sim$800 pJ at 5 GHz repetition rate at 393.3 nm and complies with all requirements for implementing a fast two-qubit gate operation. Using a single, chirped ultraviolet pulse, we demonstrate a rapid adiabatic passage in a Ca$^+$ ion. To verify the applicability and projected performance of the laser system for inducing entangling gates we run simulations based on our source parameters. The gate time can be faster than a trap period with an error approaching $10^{-4}$.
