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arXiv 2304.07884quant-ph
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通用门集合的泄漏基准测试

Leakage Benchmarking for Universal Gate Sets

Bujiao Wu, Xiaoyang Wang, Xiao Yuan, Cupjin Huang, Jianxin Chen

AI总结:

针对量子计算中泄漏误差难检测纠正的问题,提出LRB及iLRB基准测试框架,可更准确高效地测量多量子比特系统与通用门的泄漏率,数值实验验证了其可行性。

摘要:

误差是量子计算平台中的常见问题,其中泄漏是最具挑战性的问题之一。这是因为泄漏(即存储在计算子空间中的信息流失到更大希尔伯特空间中的非预期子空间)比保留计算子空间的误差更难检测和纠正。因此,泄漏对容错量子计算的发展构成了重大障碍。本文提出了一种高效且准确的基准测试框架,称为泄漏随机基准测试(LRB),用于测量多量子比特量子系统的泄漏率。与现有的泄漏基准测试协议相比,我们的方法对态制备与测量(SPAM)噪声更不敏感,对门集合本身的假设要求更少,并且可用于基准测试多量子比特泄漏——这是此前未实现的。我们还将LRB协议扩展为一种交错变体,称为交错LRB(iLRB),该协议可在合理的噪声假设下基准测试通用n位点量子门的平均泄漏率。我们在基准测试通过通量调谐实现的通用两量子比特门时演示了iLRB协议,并分析了iLRB在相应泄漏模型下的行为。我们的数值实验与理论估计结果吻合良好,表明LRB和iLRB协议均具备可行性。

英文摘要:

Errors are common issues in quantum computing platforms, among which leakage is one of the most challenging to address. This is because leakage, i.e., the loss of information stored in the computational subspace to undesired subspaces in a larger Hilbert space, is more difficult to detect and correct than errors that preserve the computational subspace. As a result, leakage presents a significant obstacle to the development of fault-tolerant quantum computation. In this paper, we propose an efficient and accurate benchmarking framework called leakage randomized benchmarking (LRB) for measuring leakage rates on multi-qubit quantum systems. Our approach is more insensitive to state preparation and measurement (SPAM) noise than existing leakage benchmarking protocols, requires fewer assumptions about the gate set itself, and can be used to benchmark multi-qubit leakages, which was not done previously. We also extend the LRB protocol to an interleaved variant called interleaved LRB (iLRB), which can benchmark the average leakage rate of generic $n$-site quantum gates with reasonable noise assumptions. We demonstrate the iLRB protocol on benchmarking generic two-qubit gates realized using flux tuning, and analyze the behavior of iLRB under corresponding leakage models. Our numerical experiments show good agreement with theoretical estimations, indicating the feasibility of both the LRB and iLRB protocols. Keywords: quantum computing; randomized benchmarking; leakage error; quantum gates

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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