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arXiv 2103.02639quant-ph
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Bell非局域性不足以保证标准的设备无关量子密钥分发协议的安全性

Bell nonlocality is not sufficient for the security of standard device-independent quantum key distribution protocols

Máté Farkas, Maria Balanzó-Juandó, Karol Łukanowski, Jan Kołodyński, Antonio Acín

摘要:

设备无关的量子密钥分发是一种安全的量子密码学范式,它允许两个诚实的用户建立一个秘密密钥,同时对他们的设备施加最小的信任。大多数现有的协议具有以下结构:首先,一个二分的非局部量子态之间的诚实用户,谁执行本地测量,建立非局部相关分布。然后,他们宣布实施的测量,并通过后处理他们的测量结果来提取安全密钥。我们表明,没有这种形式的协议允许建立一个秘密密钥时,通过测量本地投影测量某些纠缠非本地状态,即在一系列纠缠两量子位维尔纳状态的任何相关性。为了证明这一结果,我们介绍了一种技术的上界设备无关的量子密钥分发协议的渐近密钥速率,基于一个简单的窃听攻击。我们的研究结果意味着,无论是不同的和解技术需要设备无关的量子密钥分发在大噪声制度,或贝尔非局域性是不足以完成这项任务。

英文摘要:

Device-independent quantum key distribution is a secure quantum cryptographic paradigm that allows two honest users to establish a secret key, while putting minimal trust in their devices. Most of the existing protocols have the following structure: first, a bipartite nonlocal quantum state is distributed between the honest users, who perform local measurements to establish nonlocal correlations. Then, they announce the implemented measurements and extract a secure key by post-processing their measurement outcomes. We show that no protocol of this form allows for establishing a secret key when implemented on any correlation obtained by measuring local projective measurements on certain entangled nonlocal states, namely on a range of entangled two-qubit Werner states. To prove this result, we introduce a technique for upper-bounding the asymptotic key rate of device-independent quantum key distribution protocols, based on a simple eavesdropping attack. Our results imply that either different reconciliation techniques are needed for device-independent quantum key distribution in the large-noise regime, or Bell nonlocality is not sufficient for this task.

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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