论文标题
量子控制方法,用于牢固的纠缠离子
Quantum control methods for robust entanglement of trapped ions
论文作者
论文摘要
实用量子计算方式的主要障碍是实现可扩展且坚固的高保真性纠缠大门。为此,量子控制已成为必不可少的工具,因为它可以使纠缠的相互作用具有对噪声源的弹性。然而,鉴于与牢固的纠缠有关的工作广度,可能很难确定适合特定需求的量子控制技术。为此,我们试图通过提供无尽的摘要和批判性分析来巩固文献。量子控制方法分为两类:将鲁棒性扩展到(i)自旋或(ii)运动反应性的方案。我们选择专注于使用微波和静态磁场梯度的$σ_x\otimesσ_x$ Molmer-Sorensen相互作用的扩展。然而,这里讨论的某些技术可能与其他被困的离子体系结构或物理量子量子实现有关。最后,我们通过结合本手稿中介绍的几种量子控制方法,在实验上实现了概念验证的相互作用与旋转和运动反应性的同时鲁棒性的相互作用。
A major obstacle in the way of practical quantum computing is achieving scalable and robust high-fidelity entangling gates. To this end, quantum control has become an essential tool, as it can make the entangling interaction resilient to sources of noise. Nevertheless, it may be difficult to identify an appropriate quantum control technique for a particular need given the breadth of work pertaining to robust entanglement. To this end, we attempt to consolidate the literature by providing a non-exhaustive summary and critical analysis. The quantum control methods are separated into two categories: schemes which extend the robustness to (i) spin or (ii) motional decoherence. We choose to focus on extensions of the $σ_x\otimesσ_x$ Molmer-Sorensen interaction using microwaves and a static magnetic field gradient. Nevertheless, some of the techniques discussed here can be relevant to other trapped ion architectures or physical qubit implementations. Finally, we experimentally realize a proof-of-concept interaction with simultaneous robustness to spin and motional decoherence by combining several quantum control methods presented in this manuscript.