基于随机优化模型的量子线路映射辅助设计方法

物理量子位之间的受限连通性是含噪中型量子计算设备面临的重要约束之一。量子线路映射方法通过插入量子交换(SWAP)门对量子线路进行变换,使得其中的每一个量子位交互操作均满足物理设备施加的受限连通约束。在噪声环境下,减少插入的SWAP门数对于提升量子计算成功率有重要意义。以最小化SWAP门数为目标,结合随机搜索技术,提出了一种基于多迭代随机寻优模型的启发式量子线路映射优化方法。实验结果表明,该方法可以通过迭代大幅减少量子线路映射过程所需插入的量子门数,并有效降低结果物理线路对初始映射的依赖程度。

面向二维近邻架构的启发式量子线路映射算法

为解决最近邻交互约束下量子线路到二维量子计算拓扑架构的映射问题,对量子比特的初始映射策略和动态路由策略进行了研究。以降低辅助量子门数(即SWAP门)为目标,构建了量子比特的映射权重系数,并基于映射权重提出了量子比特的初始映射算法;建立了基于双层展望窗口的代价函数,并基于该代价函数提出了一种启发式量子线路映射方法。实验结果表明,相较同类算法,本文算法平均减少了26.88%的辅助量子门数。

A Roadmap to Lean Production Implementation for Small Scale Nigerian Wire and Cable Companies

The increasing customers＇ demands in terms of speed of service and reduced cost at higher quality has generated a new platform on which manufacturing companies compete. This heightened challenge is virtually driving all manufacturing companies to introducing lean manufacturing principles into their production systems. This paper focuses on the analysis of the current state mapping of a case study and then proposes a future state mapping to the company. The extruder 60 production line of Denki wires and cables limited, Akure, Nigeria was carefully evaluated. Data were collected from actual operators on the shop floor and feedbacks from the customers at the Gemba. Denki＇s extruder 60 production line production lead time was massively reduced from 38.42 days to 5.16 days with a 12.86% waste reduction. At the end, a practical way of implementing this aspect of lean manufacturing was suggested.