AI 中文总结
该研究以准二维梯子几何结构为原型，采用张量网络方法，通过对全局驱动进行时间整形，在全局驱动超导量子计算架构中实现了量子退相干的大幅缓解，压缩了门序列时间并恢复了高门保真度。
AI 中文摘要
我们以最近提出的准二维梯子几何结构为原型，证明全局最优控制可大幅抑制全局驱动超导量子计算架构中的退相干影响。采用基于张量网络的方法，我们量化了振幅阻尼和退相位通道对梯子上量子信息流动及单、两量子比特门操作保真度的退化程度。随后我们证明，对全局驱动进行整形可将门序列时间压缩一个数量级，恢复高门保真度。我们强调，这种缓解绝非易事：在全局驱动处理器中，耗散作用于所有物理量子比特，包括维持周围有序相的逻辑寄存器之外的量子比特，因此无法通过保护孤立子系统来抑制其影响，而只能通过纯全局驱动的时间整形来克服。
英文摘要
We show that global optimal control can drastically suppress the impact of decoherence in globally driven superconducting quantum computing architectures, taking as a prototype a recently proposed quasi-two-dimensional ladder geometry. Using a tensor-network-based approach, we quantify how amplitude-damping and dephasing channels degrade the flow of quantum information along the ladder and the fidelity of one- and two-qubit gate operations. We then demonstrate that shaping the global drive compresses the gate sequences by an order of magnitude in time, restoring high gate fidelities. We stress that this mitigation is far from trivial: in a globally driven processor, dissipation acts on every physical qubit---including those outside the logical register that sustain the surrounding ordered phases---so its impact cannot be suppressed by protecting an isolated subsystem, and is instead overcome purely through the temporal shaping of the global drive.
Comments14 pages, 6 figures
