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arXiv 2101.03014quant-ph
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一种基于连续变量测量的容错量子计算体系结构

A fault-tolerant continuous-variable measurement-based quantum computation architecture

Mikkel V. Larsen, Christopher Chamberland, Kyungjoo Noh, Jonas S. Neergaard-Nielsen, Ulrik L. Andersen

摘要:

基于连续变量测量的团簇量子计算与Gottesman-Kitaev-Preskill(GKP)码和量子纠错相结合,在可扩展性、通用性和容错性方面显示出巨大的潜力。然而,没有完整的容错架构存在,包括一切从集群状态生成有限挤压门实现与现实的噪声和纠错。在这项工作中,我们提出了一个简单的架构,在三维空间中,门门的隐形传态可以有效地实现集群状态的准备。为了适应可扩展性,我们提出了允许空间和时间复用的架构,时间编码的版本只需要两个压缩光源。由于其三维结构,该架构支持拓扑量子比特纠错,而GKP纠错通过隐形传态在架构内有效地实现。为了验证容错性,使用表面GKP代码,包括GKP态的噪声以及簇态有限压缩引起的门噪声,对该结构进行了模拟。我们发现一个容错的压缩阈值为12.7 dB的空间,进一步改进。

英文摘要:

Continuous variable measurement-based quantum computation on cluster states has in recent years shown great potential for scalable, universal, and fault-tolerant quantum computation when combined with the Gottesman-Kitaev-Preskill (GKP) code and quantum error correction. However, no complete fault-tolerant architecture exists that includes everything from cluster state generation with finite squeezing to gate implementations with realistic noise and error correction. In this work, we propose a simple architecture for the preparation of a cluster state in three dimensions in which gates by gate teleportation can be efficiently implemented. To accommodate scalability, we propose architectures that allow for both spatial and temporal multiplexing, with the temporal encoded version requiring as little as two squeezed light sources. Due to its three-dimensional structure, the architecture supports topological qubit error correction, while GKP error correction is efficiently realized within the architecture by teleportation. To validate fault-tolerance, the architecture is simulated using surface-GKP codes, including noise from GKP-states as well as gate noise caused by finite squeezing in the cluster state. We find a fault-tolerant squeezing threshold of 12.7 dB with room for further improvement.

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