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arXiv 0806.0383quant-phcond-mat.supr-con
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带偏置噪声的超导量子比特容错计算

Fault-Tolerant Computing With Biased-Noise Superconducting Qubits

Panos Aliferis, Frederico Brito, David P. DiVincenzo, John Preskill, Matthias Steffen, Barbara M. Terhal

摘要:

我们提出了一个通用的计划,脉冲操作的IBM振荡器稳定的通量量子比特包括CPHASE门,单量子比特的准备和测量。基于数值模拟,我们认为这些操作的错误率可以低至约0.5%,并且噪声具有高度偏差,相位误差比所有其他类型的误差强近10^3倍。相比之下,设计一个错误率小于1.2%的CNOT门似乎是非常具有挑战性的。我们提出了一种特殊的编码,利用噪声偏置,使我们能够实现一个逻辑CNOT门相位误差和所有其他类型的错误几乎平衡率约为0.4%。我们的研究结果说明了如何设计的编码方案可以调整和优化,根据可用的物理操作和特定的噪声特性的实验设备。

英文摘要:

We present a universal scheme of pulsed operations for the IBM oscillator-stabilized flux qubit comprising the CPHASE gate, single-qubit preparations and measurements. Based on numerical simulations, we argue that the error rates for these operations can be as low as about .5% and that noise is highly biased, with phase errors being stronger than all other types of errors by a factor of nearly 10^3. In contrast, the design of a CNOT gate for this system with an error rate of less than about 1.2% seems extremely challenging. We propose a special encoding which exploits the noise bias allowing us to implement a logical CNOT gate where phase errors and all other types of errors have nearly balanced rates of about .4%. Our results illustrate how the design of an encoding scheme can be adjusted and optimized according to the available physical operations and the particular noise characteristics of experimental devices.

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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