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arXiv 0710.1301quant-phcond-mat.mes-hallcond-mat.supr-con
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抗偏置噪声的容错量子计算

Fault-tolerant quantum computation against biased noise

Panos Aliferis, John Preskill

摘要:

我们制定了一个容错量子计算的方案,有效地对抗高度偏置的噪声,其中失相远远强于所有其他类型的噪声。在我们的方案中,量子计算机执行的基本操作是单量子位准备,单量子位测量和条件相位(CPHASE)门,其中CPHASE门中的噪声是有偏的。我们表明,量子计算的精度阈值可以通过利用这种噪声不对称性来提高;例如,如果移相在CPHASE门中以四个数量级支配所有其他类型的噪声,我们发现精确度阈值的严格下限比无偏噪声的情况高五倍。

英文摘要:

We formulate a scheme for fault-tolerant quantum computation that works effectively against highly biased noise, where dephasing is far stronger than all other types of noise. In our scheme, the fundamental operations performed by the quantum computer are single-qubit preparations, single-qubit measurements, and conditional-phase (CPHASE) gates, where the noise in the CPHASE gates is biased. We show that the accuracy threshold for quantum computation can be improved by exploiting this noise asymmetry; e.g., if dephasing dominates all other types of noise in the CPHASE gates by four orders of magnitude, we find a rigorous lower bound on the accuracy threshold higher by a factor of five than for the case of unbiased noise.

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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