论文标题
通过递归MWPM解码增强表面代码的性能
Performance enhancement of surface codes via recursive MWPM decoding
论文作者
论文摘要
最小重量完美匹配(MWPM)解码器是量子表面代码的标准解码策略。但是,当遭受偏见或非相同的量子噪声时,性能的严重下降。在这项工作中,我们修改了传统的MWPM解码器,以便考虑到给定表面代码的组成量的偏见,非均匀性和关系。我们称为递归MWPM解码器的修改方法,在去极化噪声下获得了$ 18 \%$的改进。当考虑偏见的噪声和独立的非相同分布(i.ni.d。)误差模型时,我们还获得了显着的性能改善,这些误差模型是从最先进的量子处理器上执行的测量结果得出的。实际上,当受到i.ni.d.递归MWPM解码器的噪声比常规MWPM策略的性能提高了$ 105.5 \%$,在某些情况下,它甚至超过了众所周知的去极化通道上获得的性能。
The minimum weight perfect matching (MWPM) decoder is the standard decoding strategy for quantum surface codes. However, it suffers a harsh decrease in performance when subjected to biased or non-identical quantum noise. In this work, we modify the conventional MWPM decoder so that it considers the biases, the non-uniformities and the relationship between $X$, $Y$ and $Z$ errors of the constituent qubits of a given surface code. Our modified approach, which we refer to as the recursive MWPM decoder, obtains an $18\%$ improvement in the probability threshold $p_{th}$ under depolarizing noise. We also obtain significant performance improvements when considering biased noise and independent non-identically distributed (i.ni.d.) error models derived from measurements performed on state-of-the-art quantum processors. In fact, when subjected to i.ni.d. noise, the recursive MWPM decoder yields a performance improvement of $105.5\%$ over the conventional MWPM strategy and, in some cases, it even surpasses the performance obtained over the well-known depolarizing channel.