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arXiv 1807.09334quant-ph
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驱动非线性腔中的稳定猫:一种容错错误综合征检测器

Stabilized Cat in Driven Nonlinear Cavity: A Fault-Tolerant Error Syndrome Detector

Shruti Puri, Alexander Grimm, Philippe Campagne-Ibarcq, Alec Eickbusch, Kyungjoo Noh, Gabrielle Roberts, Liang Jiang, Mazyar Mirrahimi, Michel H. Devoret, Steven M. Girvin

摘要:

在量子纠错中,信息被编码在一个高维系统中,以保护它免受环境的影响。关键的一步是使用自然的、低权重的操作和辅助操作来提取错误信息,而不会对编码系统造成反作用。基本上,附属错误必须不传播到编码系统,并引起超出那些可以纠正的错误。当前用于实现对辅助错误的这种容错的方案是以增加开销要求为代价的。一个有效的方法来提取错误的症状,在容错的方式是通过使用一个单一的辅助强偏置噪声通道。然而,通常,当噪声极度偏置时,所需的基本运算可能变得具有挑战性。我们建议通过在参数驱动的非线性腔中使用玻色猫辅助来克服这个缺点。这样的猫量子比特只经历比特翻转噪声,并且相对于相位翻转是稳定的。为了突出这种方法的灵活性,我们说明了在各种代码,如量子位为基础的复曲面代码,玻色子猫和Gottesman-Kitaev-Preskill(GKP)代码的综合征提取过程。我们的研究结果为实现硬件高效,容错的错误伴随式提取开辟了一条道路。

英文摘要:

In quantum error correction, information is encoded in a high-dimensional system to protect it from the environment. A crucial step is to use natural, low-weight operations with an ancilla to extract information about errors without causing backaction on the encoded system. Essentially, ancilla errors must not propagate to the encoded system and induce errors beyond those which can be corrected. The current schemes for achieving this fault-tolerance to ancilla errors come at the cost of increased overhead requirements. An efficient way to extract error syndromes in a fault-tolerant manner is by using a single ancilla with strongly biased noise channel. Typically, however, required elementary operations can become challenging when the noise is extremely biased. We propose to overcome this shortcoming by using a bosonic-cat ancilla in a parametrically driven nonlinear cavity. Such a cat-qubit experiences only bit-flip noise and is stabilized against phase-flips. To highlight the flexibility of this approach, we illustrate the syndrome extraction process in a variety of codes such as qubit-based toric codes, bosonic cat- and Gottesman-Kitaev-Preskill (GKP) codes. Our results open a path for realizing hardware-efficient, fault-tolerant error syndrome extraction.

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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