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arXiv quant-ph/0206061quant-ph
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级联量子码的精确性能

Exact Performance of Concatenated Quantum Codes

Benjamin Rahn, Andrew C. Doherty, Hideo Mabuchi

摘要:

当使用量子纠错码保护逻辑量子比特时,编码、去相干(作用于码字中的量子比特的物理信道)和恢复的净效应可以由直接作用于逻辑量子比特的有效信道精确地表示。在本文中,我们描述了一个程序,用于导出物理和有效的信道,结果从一个给定的编码和恢复过程之间的映射。我们表明,地图的级联代码是由组成代码的地图的组成。这种观点导致了一种有效的手段来计算量子码的精确性能与任意级别的级联。我们提出了明确的结果为单比特泡利通道。对于对称去极化信道下的某些码,我们使用编码映射来计算精确的阈值错误概率,在无限级联极限下的完美保真度的可扩展性。

英文摘要:

When a logical qubit is protected using a quantum error-correcting code, the net effect of coding, decoherence (a physical channel acting on qubits in the codeword) and recovery can be represented exactly by an effective channel acting directly on the logical qubit. In this paper we describe a procedure for deriving the map between physical and effective channels that results from a given coding and recovery procedure. We show that the map for a concatenation of codes is given by the composition of the maps for the constituent codes. This perspective leads to an efficient means for calculating the exact performance of quantum codes with arbitrary levels of concatenation. We present explicit results for single-bit Pauli channels. For certain codes under the symmetric depolarizing channel, we use the coding maps to compute exact threshold error probabilities for achievability of perfect fidelity in the infinite concatenation limit.

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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