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arXiv 1409.4880quant-ph
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实用拓扑簇态量子计算要求损耗低于1%

Practical Topological Cluster State Quantum Computing Requires Loss Below 1%

Adam C. Whiteside, Austin G. Fowler

摘要:

当量子比特在计算过程中消失时,表面码就不能使用了;相反,一种被称为拓扑簇态的变体是必要的。它的门错误阈值为0.75%,并且只需要在2D量子位阵列上的最近邻相互作用。先前使用此代码进行的损失容限工作仅考虑测量期间量子位消失。首先,我们还包括两个量子比特门和初始化过程中的量子比特丢失,然后额外考虑当邻居试图与不存在的量子比特纠缠时发生的相互作用错误。在这样做时,我们表明,即使是我们最好的情况下,需要低于1%的损失率,以避免相当大的空间-时间开销。

英文摘要:

The surface code cannot be used when qubits vanish during computation; instead, a variant known as the topological cluster state is necessary. It has a gate error threshold of $0.75% and only requires nearest-neighbor interactions on a 2D array of qubits. Previous work on loss tolerance using this code only considered qubits vanishing during measurement. We begin by also including qubit loss during two-qubit gates and initialization, and then additionally consider interaction errors that occur when neighbors attempt to entangle with a qubit that isn't there. In doing so, we show that even our best case scenario requires a loss rate below 1% in order to avoid considerable space-time overhead.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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