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arXiv 1902.09102quant-phcs.DS
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量子体系结构的电路变换

Circuit Transformations for Quantum Architectures

Andrew M. Childs, Eddie Schoute, Cem M. Unsal

摘要:

量子计算机架构对量子比特相互作用施加了限制。我们提出了有效的电路变换,修改一个给定的量子线路,以适应一个架构,允许任何初始和最终的电路量子位的映射到架构量子位。为了实现这一点,我们首先考虑量子位移动子问题,并使用路由通过匹配框架,以证明更严格的边界上的并行路由。实际上,我们只需要执行部分置换,因此我们通过匹配将路由推广到该设置。我们给出了新的路由程序的常见架构图和广义层次积的图形,产生子图的笛卡尔积。其次,对于串行路由,我们考虑令牌交换框架,并扩展了一般图的4-近似算法,以支持部分置换。我们应用这些路由程序给出几个电路变换,使用各种启发式量子位放置子程序。我们在软件中实现这些转换,并比较它们在网格和模块化架构上的大型量子线路的性能,确定在实践中工作良好的策略。

英文摘要:

Quantum computer architectures impose restrictions on qubit interactions. We propose efficient circuit transformations that modify a given quantum circuit to fit an architecture, allowing for any initial and final mapping of circuit qubits to architecture qubits. To achieve this, we first consider the qubit movement subproblem and use the routing via matchings framework to prove tighter bounds on parallel routing. In practice, we only need to perform partial permutations, so we generalize routing via matchings to that setting. We give new routing procedures for common architecture graphs and for the generalized hierarchical product of graphs, which produces subgraphs of the Cartesian product. Secondly, for serial routing, we consider the token swapping framework and extend a 4-approximation algorithm for general graphs to support partial permutations. We apply these routing procedures to give several circuit transformations, using various heuristic qubit placement subroutines. We implement these transformations in software and compare their performance for large quantum circuits on grid and modular architectures, identifying strategies that work well in practice.

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