Union-find quantum decoding without union-find
Union-find quantum decoding without union-find
复制标题
没有并查的并查量子解码
DOI:
10.1103/physrevresearch.6.013154
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发表时间:
2024
影响因子:
4.2
通讯作者:
Griffiths S
中科院分区:
文献类型:
--
作者:
Griffiths S
The union-find decoder is a leading algorithmic approach to the correction of quantum errors on the surface code, achieving code thresholds comparable to minimum-weight perfect matching (MWPM) with amortized computational time scaling near-linearly in the number of physical qubits. This complexity is achieved via optimizations provided by the disjoint-set data structure. We demonstrate, however, that the behavior of the decoder at scale underutilizes this data structure for twofold analytic and algorithmic reasons, and that improvements and simplifications can be made to architectural designs to reduce resource overhead in practice. To reinforce this, we model the behavior of erasure clusters formed by the decoder and show that there does not exist a percolation threshold within the data structure for any mode of operation. This yields a linear-time worst-case complexity for the decoder at scale, even with a naive implementation omitting popular optimizations.
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