论文标题

基于纯量子通道极化的量子极性稳定器代码不适用于量子计算

Quantum polar stabilizer codes based on polarization of pure quantum channel don't work for quantum computing

论文作者

Yi, Zhengzhong, Liang, Zhipeng, Wu, Yulin, Wang, Xuan

论文摘要

受经典的极地代码的启发,其编码速率可以渐近地实现香农的能力,研究人员正试图在量子信息字段中找到其类似物,这些信息字段称为量子极性代码。但是,没有人设计了适用于量子计算的量子极地编码方案。先前的研究中有两种直觉。首先是将经典的极性编码电路直接转换为量子量电路将产生纯量子通道的极化现象,这在我们以前的工作中已证明。第二个是基于这种量子极化现象,可以设计适用于量子计算的量子极性编码方案。在第二个直觉之后,先前有几项工作,但没有通过实验验证。在本文中,我们遵循第二个直觉,并通过使用稳定器代码理论提出了比以前的任何一个更合理的量子稳定器代码构建算法。不幸的是,模拟实验表明,即使是从这种更合理的结构算法获得的稳定器代码也不起作用,这意味着第二个直觉会导致死胡同。基于关于第二个直觉不起作用的分析,我们通过借用经典极地代码的概念来设计具有高编码速率的量子稳定器代码的未来方向。遵循此方向,我们找到了一类量子稳定器代码,纯Pauli X,Z和Y噪声的编码速率为0.5。

Inspired by classical polar codes, whose coding rate can asymptotically achieve the Shannon capacity, researchers are trying to find its analogue in quantum information field, which are called quantum polar codes. However, no one has designed a quantum polar coding scheme which applies to quantum computing yet. There are two intuitions in previous research. The first is that directly converting classical polar coding circuits to quantum ones will produce polarization phenomenon of pure quantum channel, which has been proved in our previous work. The second is that based on this quantum polarization phenomenon one can design a quantum polar coding scheme that applies to quantum computing. There are several previous work following the second intuition, none of which has been verified by experiments. In this paper, we follow the second intuition and propose a more reasonable quantum polar stabilizer code construction algorithm than any previous ones by using the theory of stabilizer codes. Unfortunately, simulation experiments show that even the stabilizer codes obtained from this more reasonable construction algorithm don't work, which implies that the second intuition leads to a dead end. Based on the analysis on why the second intuition don't work, we provide a possible future direction of designing quantum stabilizer codes with high coding rate by borrowing the idea of classical polar codes. following this direction, we find a class of quantum stabilizer codes with coding rate 0.5 for pure Pauli X, Z and Y noise.

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