超越线性光学极限的逻辑贝尔态测量的演示
Demonstration of a logical Bell-state measurement beyond the linear-optical limit
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中文总结 AI 辅助
本研究利用线性光学和两量子比特重复码实现逻辑贝尔态测量，成功概率达70.8%，超越线性光学50%的极限，为容错光子量子技术提供关键进展。
中文摘要 AI 辅助
容错对于可扩展量子技术至关重要，并通过量子纠错码实现。贝尔态测量（BSM）是现代量子技术（如基于测量的量子计算、基于融合的量子计算以及量子网络）的基本构建模块。因此，对纠错后的量子比特执行BSM是在这些应用中实现容错的必要步骤。在本工作中，我们利用线性光学，基于两量子比特重复码（一种量子奇偶校验码，能够检测比特翻转错误）实现了逻辑BSM，并实验获得了（70.8±0.4）%的平均成功概率。虽然标准线性光学BSM在根本上受限于最大50%的成功概率，但这一提高的成功概率能够在量子通信中实现更高的安全密钥率，并有助于生成用于量子计算的大型图态。由于容错方案无论如何都需要纠错码，这一改进不会带来额外的资源开销。我们的结果表明，纠错码可用于超越BSM的线性光学极限，这是迈向实用、容错和可扩展的光子量子技术的重要一步。
英文摘要
Fault tolerance is essential for scalable quantum technologies and is enabled by quantum error-correction codes. Bell-state measurements (BSMs) are a fundamental building block for modern quantum technologies such as measurement-based quantum computation and fusion-based quantum computation, as well as quantum networks. Therefore, performing BSMs on error-corrected qubits is a necessary step for achieving fault tolerance in these applications. In this work, we realise a logical BSM using linear optics, based on a two-qubit repetition code, an instance of a quantum parity code that allows detection of bit-flip errors, and experimentally achieve a mean success probability of (70.8 +/- 0.4)%. While standard linear-optical BSMs are fundamentally limited to a maximum success probability of 50%, this increased success probability enables higher secure key rates in quantum communication and facilitates the generation of large graph states for quantum computation. Since fault-tolerant schemes require error-correction codes regardless, this improvement comes at no additional resource overhead. Our results demonstrate that error-correction codes can be used to surpass the linear-optics limit of BSMs, which is an important step towards practical, fault-tolerant, and scalable photonic quantum technologies.
发表机构
- University of Stuttgart（斯图加特大学）
- Johannes-Gutenberg University of Mainz（约翰内斯·古腾堡美因茨大学）
机构由 AI 辅助整理，请以论文原文为准。
