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arXiv 1106.2190quant-ph
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23比特Golay码的容错辅助码制备和噪声阈值下限

Fault-tolerant ancilla preparation and noise threshold lower bounds for the 23-qubit Golay code

Adam Paetznick, Ben W. Reichardt

摘要:

在容错量子计算方案中,开销通常由可靠地准备码字的成本决定。该成本通常与底层量子纠错码的块大小成二次方地增加。因此,大的代码,否则是非常有效的发现有限的容错应用。因此,容错准备电路是优化的重要目标。我们研究了Golay码,这是一种23量子比特的量子纠错码,可以保护逻辑量子比特的距离为7。在模拟中,即使使用一个天真的辅助准备过程中,Golay码是竞争力与其他代码的开销和可容忍的噪声阈值。我们提供了两个简化的电路容错准备戈莱码编码的辅助。新电路最大限度地减少了错误传播,与标准编码电路相比,开销大约减少了四分之一。通过将恶性集计数技术应用于去极化噪声,我们进一步证明了每个门的阈值高于1.32 x 10^{-3}噪声。

英文摘要:

In fault-tolerant quantum computing schemes, the overhead is often dominated by the cost of preparing codewords reliably. This cost generally increases quadratically with the block size of the underlying quantum error-correcting code. In consequence, large codes that are otherwise very efficient have found limited fault-tolerance applications. Fault-tolerant preparation circuits therefore are an important target for optimization. We study the Golay code, a 23-qubit quantum error-correcting code that protects the logical qubit to a distance of seven. In simulations, even using a naive ancilla preparation procedure, the Golay code is competitive with other codes both in terms of overhead and the tolerable noise threshold. We provide two simplified circuits for fault-tolerant preparation of Golay code-encoded ancillas. The new circuits minimize error propagation, reducing the overhead by roughly a factor of four compared to standard encoding circuits. By adapting the malignant set counting technique to depolarizing noise, we further prove a threshold above 1.32 x 10^{-3} noise per gate.

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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