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arXiv 2506.04084quant-ph
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一种用于表面码的幺正编码器

A Unitary Encoder for Surface Codes

Yale University(耶鲁大学);Yale Quantum Institute, Yale University(耶鲁量子研究所)

Pei-Kai Tsai, Shruti Puri

AI总结:

本文提出一种基于旋转与规则表面码转换的非局域幺正编码器,将最快编码门数减半,并在制备泡利Y本征态等任务中优于现有局域幺正编码器和稳定子测量编码器,适用于中性原子和俘获离子等平台。

摘要:

表面码是实现容错量子计算的有力候选方案,并已在多种量子硬件平台上得到实现。在本工作中,我们基于旋转表面码与规则表面码之间的编码转换,提出了一种新的非局域幺正电路来编码表面码态,该电路将此前已知最快编码器的门数量减少了一半。虽然幺正编码器可用于增大码距,但容错距离仍保持不变。尽管如此,它们可以用于时空高效地制备那些难以通过横向操作直接获取的表面码算符本征态,例如泡利Y本征态和Clifford本征态。人们可能预期,与局域幺正编码电路相比,非局域电路中的错误传播会使解码更具挑战性。然而,我们发现情况并非如此,传统的匹配解码器可以有效地使用。此外,我们进行了数值模拟,将我们的编码器与先前的局域幺正编码器以及基于传统稳定子测量的编码器在制备泡利Y本征态方面的性能进行基准比较,并发现在实验相关的噪声区间内,我们的编码器能够优于这些方法。因此,我们的编码器在具有非局域相互作用能力的平台(如中性原子和俘获离子)中提供了实际优势。

英文摘要:

The surface code is a promising candidate for fault-tolerant quantum computation and has been implemented in many quantum hardware platforms. In this work, we propose a new non-local unitary circuit to encode a surface code state based on a code conversion between rotated and regular surface codes, which halves the gate count of the fastest encoder known previously. While the unitary encoders can be used to increase the code distance, the fault-distance remains fixed. Nonetheless, they can be used for space-time efficient realization of eigenstates of the surface code operators that can't be easily accessed transversally such as the Pauli Y-eignestate and Clifford eigenstates. It may be expected that error propagation in the non-local circuit will make decoding more challenging compared to local unitary encoding circuits. However, we find this not to be the case and that conventional matching decoders can be effectively used. Furthermore, we perform numerical simulations to benchmark the performance of our encoder against a previous local unitary encoder and the conventional stabilizer-measurement based encoder for preparing the Pauli Y-eigenstate and find that our encoder can outperform these in experimentally relevant noise regimes. Therefore, our encoder provides practical advantage in platforms where non-local interactions are available such as neutral atoms and trapped ions.

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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