Improved semi-quantum key distribution with two almost-classical users
Improved semi-quantum key distribution with two almost-classical users
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DOI：
10.1007/s11128-022-03663-x
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发表时间：
2022-03
影响因子：
2.5
通讯作者：
Saachi Mutreja;Walter O. Krawec
中科院分区：
文献类型：
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作者：
Saachi Mutreja;Walter O. Krawec
半量子密钥分发(SQKD)协议试图在用户之间建立共享密钥，以防止计算上的无限攻击。与标准量子密钥分发协议不同，SQKD协议至少包含一个用户，该用户的量子能力是有限的，并且本质上几乎是经典的。本文回顾了Massa等人提出的一种中介半量子密钥分配协议。(2019年经典用户的量子密码学实验。Arxiv预印本arxiv：1908.01780)，其中用户只需要检测量子比特或反射量子比特的能力；他们不需要执行任何其他基本测量；也不需要准备量子信号。用户需要量子服务器的服务，该服务器可能由对手控制。在本文中，我们展示了如何对该协议进行扩展以提高其效率和抗噪能力。我们讨论了一种允许更多通信轮次直接使用的扩展；我们分析了该扩展在一类特定攻击的渐近场景下的密钥率，并与以前的工作进行了比较。最后，我们对该协议在各种有损和噪声信道中的性能进行了评估。
Semi-quantum key distribution (SQKD) protocols attempt to establish a shared secret key between users, secure against computationally unbounded adversaries. Unlike standard quantum key distribution protocols, SQKD protocols contain at least one user who is limited in their quantum abilities and is almost “classical” in nature. In this paper, we revisit a mediated semi-quantum key distribution protocol, introduced by Massa et al. (Experimental quantum cryptography with classical users, 2019. arXiv preprint arXiv:1908.01780), where users need only the ability to detect a qubit, or reflect a qubit; they do not need to perform any other basis measurement; nor do they need to prepare quantum signals. Users require the services of a quantum server which may be controlled by the adversary. In this paper, we show how this protocol may be extended to improve its efficiency and also its noise tolerance. We discuss an extension which allows more communication rounds to be directly usable; we analyze the key-rate of this extension in the asymptotic scenario for a particular class of attacks and compare with prior work. Finally, we evaluate the protocol’s performance in a variety of lossy and noisy channels.