Advantage distillation for quantum key distribution

IF 5.6 2区 物理与天体物理 Q1 PHYSICS, MULTIDISCIPLINARY Quantum Science and Technology Pub Date : 2024-12-20 DOI:10.1088/2058-9565/ad9d75
Zhenyu Du, Guoding Liu, Xingjian Zhang and Xiongfeng Ma
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Abstract

Quantum key distribution promises information-theoretically secure communication, with data post-processing playing a vital role in extracting secure keys from raw data. While hardware advancements have significantly improved practical implementations, optimizing post-processing techniques offers a cost-effective avenue to enhance performance. Advantage distillation, which extends beyond standard information reconciliation and privacy amplification, has proven instrumental in various post-processing methods. However, the optimal post-processing remains an open question. Therefore, it is important to develop a comprehensive framework to encapsulate and enhance these existing methods. In this work, we propose an advantage distillation framework for quantum key distribution, generalizing and unifying existing key distillation protocols. Inspired by entanglement distillation, our framework not only integrates current techniques but also improves upon them. Notably, by employing classical linear codes, we achieve higher key rates, particularly in scenarios where one-time pad encryption is not used for post-processing. Our approach provides insights into existing protocols and offers a systematic way for further enhancements in quantum key distribution.
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量子密钥分发的优势蒸馏
量子密钥分发保证了信息理论上的安全通信,数据后处理在从原始数据中提取安全密钥方面起着至关重要的作用。虽然硬件的进步大大改善了实际实现,但优化后处理技术提供了一种经济有效的方法来提高性能。优势蒸馏,超出了标准的信息协调和隐私放大,已被证明在各种后处理方法的工具。然而,最佳的后处理仍然是一个悬而未决的问题。因此,开发一个全面的框架来封装和增强这些现有的方法是很重要的。在这项工作中,我们提出了一个量子密钥分发的优势蒸馏框架,推广和统一了现有的密钥蒸馏协议。受纠缠蒸馏的启发,我们的框架不仅集成了当前的技术,而且对它们进行了改进。值得注意的是,通过使用经典线性代码,我们实现了更高的密钥速率,特别是在不使用一次性填充加密进行后处理的情况下。我们的方法提供了对现有协议的见解,并为进一步增强量子密钥分发提供了一种系统的方法。
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来源期刊
Quantum Science and Technology
Quantum Science and Technology Materials Science-Materials Science (miscellaneous)
CiteScore
11.20
自引率
3.00%
发文量
133
期刊介绍: Driven by advances in technology and experimental capability, the last decade has seen the emergence of quantum technology: a new praxis for controlling the quantum world. It is now possible to engineer complex, multi-component systems that merge the once distinct fields of quantum optics and condensed matter physics. Quantum Science and Technology is a new multidisciplinary, electronic-only journal, devoted to publishing research of the highest quality and impact covering theoretical and experimental advances in the fundamental science and application of all quantum-enabled technologies.
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