论文标题
通过参数调整和拓扑补偿来提高逻辑Qubit的性能
Improving performance of logical qubits by parameter tuning and topology compensation
论文作者
论文摘要
可以通过少量安装程序来启用任意成对ISING模型的优化或取样，在约束相互作用拓扑的量子退火方案中可以启用。感兴趣的逻辑问题转变为物理（设备可编程）问题，其中一个二进制变量由由多个物理量子台组成的逻辑量子代表。在本文中，我们讨论了D-WAVE 2000Q量子计算机上集团，双晶体和立方晶格问题的调整。我们演示了旋转眼镜和通道通信问题中的参数调整协议，重点是退火持续时间，链强度以及从物理Qubit的结果映射到逻辑空间。通过有效的程序耦合的有效重新加权，可以减轻因辅助辅助而产生的有效耦合强度的不均匀性，这是逻辑量子拓扑的解释。
Optimization or sampling of arbitrary pairwise Ising models, in a quantum annealing protocol of constrained interaction topology, can be enabled by a minor-embedding procedure. The logical problem of interest is transformed to a physical (device programmable) problem, where one binary variable is represented by a logical qubit consisting of multiple physical qubits. In this paper we discuss tuning of this transformation for the cases of clique, biclique, and cubic lattice problems on the D-Wave 2000Q quantum computer. We demonstrate parameter tuning protocols in spin glasses and channel communication problems, focusing on anneal duration, chain strength, and mapping from the result on physical qubits back to the logical space. Inhomogeneities in effective coupling strength arising from minor-embedding are shown to be mitigated by an efficient reweighting of programmed couplings, accounting for logical qubit topology.
