利用标志状态压缩模型提高非平衡相位编码BB84协议的密钥速率
Improving key rates of the unbalanced phase-encoded BB84 protocol using the flag-state squashing model
摘要：
实际上，所有相位编码BB84实现都具有幅度不平衡的信号状态。因此，最初的安全分析先验不适用于他们。以前的安全证明使用多光子脉冲的信号标记来恢复常规BB84的行为。这是过于保守的，因为对于不平衡的信号，光子数分裂攻击不会将全部信息泄露给Eve。在这项工作中，我们利用旗态挤压模型，以保持我们的分析中的多光子产生的私人信息的一部分。使用数值证明技术，与之前发表的低损耗机制结果相比，我们获得了显着更高的密钥速率。事实证明，不可信暗计数的通常情况在某些参数范围内遇到了概念上的困难。因此，我们在本文中也讨论了可信暗计数场景。我们还报告说，当已知总损失的一部分是由可信设备引起时，关键利率会有所提高。我们强调，所有这些关键速率的改善，可以实现不修改的实验设置。
英文摘要：
All phase-encoded BB84 implementations have signal states with unbalanced amplitudes in practice. Thus, the original security analyses a priori do not apply to them. Previous security proofs use signal tagging of multi-photon pulses to recover the behaviour of regular BB84. This is overly conservative, as for unbalanced signals, the photon-number splitting attack does not leak full information to Eve. In this work, we exploit the flag-state squashing model to preserve some parts of the multi-photon generated private information in our analysis. Using a numerical proof technique, we obtain significantly higher key rates compared with previously published results in the low-loss regime. It turns out that the usual scenario of untrusted dark counts runs into conceptual difficulties in some parameter regime. Thus, we discuss the trusted dark count scenario in this paper as well. We also report a gain in key rates when part of the total loss is known to be induced by a trusted device. We highlight that all these key rate improvements can be achieved without modification of the experimental setup.
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。
