论文标题
改进了两个几乎古典用户的半量子密钥分布
Improved Semi-Quantum Key Distribution with Two Almost-Classical Users
论文作者
论文摘要
半Quantum密钥分布（SQKD）协议试图在用户之间建立一个共享的秘密密钥，并确保不受计算无限的对手。与标准量子密钥分配协议不同，SQKD协议至少包含一个用户，这些用户的量子能力受到限制，并且本质上几乎是“经典”的。在本文中，我们重新审视了Massa等人在2019年引入的介导的半量子密钥分布协议，在该协议中，用户只需要检测量子或反射量子的能力。他们不需要执行任何其他基础测量；他们也不需要准备量子信号。用户需要可以由对手控制的量子服务器的服务。在本文中，我们展示了如何扩展该协议以提高其效率及其噪声耐受性。我们讨论一个扩展名，该扩展可以直接可用。我们分析了特定类攻击类别的渐近场景中此扩展的关键率，并与先前的工作进行了比较。最后，我们在各种有损和嘈杂的渠道中评估了该协议的性能。
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., in 2019, 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.
