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arXiv 2003.10511quant-ph
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量子纠错码中逻辑噪声的有效计算

Efficiently computing logical noise in quantum error correcting codes

Stefanie J. Beale, Joel J. Wallman

摘要:

已经开发了量子纠错协议来抵消量子系统中固有的对噪声的高敏感性。然而,关于量子纠错码在一般噪声(包括噪声测量)下的行为,还有很多未知数。这种知识的缺乏在很大程度上是由于模拟量子系统的计算成本大到足以执行非平凡编码。在本文中,我们开发的一般方法,将噪声测量操作到模拟的量子纠错码,并显示读出量子位的测量误差表现为重整化的有效逻辑噪声。我们还得到了一般的方法,用于减少计算精确的有效逻辑噪声的计算复杂性的许多数量级。通过确定不同恢复操作何时产生等效逻辑噪声来实现这种降低。这些方法也可以用于更好地近似级联码的软解码方案,或者减少查找表的大小以加速量子纠错码实现中的纠错步骤。我们给出了三量子比特,五量子比特,Steane,级联和复曲面码的这种减少的例子。

英文摘要:

Quantum error correction protocols have been developed to offset the high sensitivity to noise inherent in quantum systems. However, much is still unknown about the behaviour of a quantum error-correcting code under general noise, including noisy measurements. This lack of knowledge is largely due to the computational cost of simulating quantum systems large enough to perform nontrivial encodings. In this paper, we develop general methods for incorporating noisy measurement operations into simulations of quantum error-correcting codes and show that measurement errors on readout qubits manifest as a renormalization on the effective logical noise. We also derive general methods for reducing the computational complexity of calculating the exact effective logical noise by many orders of magnitude. This reduction is achieved by determining when different recovery operations produce equivalent logical noise. These methods could also be used to better approximate soft decoding schemes for concatenated codes or to reduce the size of a lookup table to speed up the error correction step in implementations of quantum error-correcting codes. We give examples of such reductions for the three-qubit, five-qubit, Steane, concatenated, and toric codes.

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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