arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2102.10030quant-ph
收藏

论量子权重降低

On Quantum Weight Reduction

M. B. Hastings

AI总结:

提出一种名为“锥化”的通用权重降低方法,可将任意LDPC码的稳定子权重降至至多5,并基于此构建了具有 $\tilde \Omega(N^{2/3})$ 距离和逻辑量子比特的LDPC量子码。

摘要:

我们给出了一种降低量子码权重的通用方法。这纠正了先前的工作[owr],并引入了一种我们称为“锥化”的新技术,以在 LDPC 码中有效诱导高权重稳定子。作为一项应用,任何 LDPC 码(具有任意 $O(1)$ 稳定子权重)都可以转化为一个所有稳定子权重至多为 $5$ 的码,其代价是物理量子比特数量增加至多一个常数因子,且距离减少一个常数因子。此外,通过将该技术应用于一个 $X$-稳定子源自经典对数权重随机码且 $Z$-稳定子具有线性权重的量子码,我们构建了一个距离为 $\tilde \Omega(N^{2/3})$ 且具有 $\tilde\Omega(N^{2/3})$ 逻辑量子比特的 LDPC 量子码。

英文摘要:

We give a general procedure for weight reducing quantum codes. This corrects a previous work\cite{owr}, and introduces a new technique that we call "coning" to effectively induce high weight stabilizers in an LDPC code. As one application, any LDPC code (with arbitrary $O(1)$ stabilizer weights) may be turned into a code where all stabilizers have weight at most $5$ at the cost of at most a constant factor increase in number of physical qubits and constant factor reduction in distance. Also, by applying this technique to a quantum code whose $X$-stabilizers are derived from a classical log-weight random code and whose $Z$-stabilizers have linear weight, we construct an LDPC quantum code with distance $\tilde Ω(N^{2/3})$ and $\tildeΩ(N^{2/3})$ logical qubits.

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。

↑