论文标题
易耐损耗的量子键分布
Loss-tolerant quantum key distribution with a twist
论文作者
论文摘要
测量设备无关的量子键分布（MDI QKD）的安全性取决于对一个人的光源输出的彻底表征，尤其是状态准备过程中的任何噪声。在这里，我们提供了容忍损失方案的扩展[Phys。 Rev. A 90，052314（2014）]，一种用于分析QKD安全性的主要证明技术，用于采用混合信号状态的MDI QKD协议。我们首先重新构架了证明技术的核心，并指出其概括以处理$ d $二维信号编码。专注于量子信号状态案例，我们发现混合状态可以解释为为爱丽丝和鲍勃提供他们可以采用的虚拟屏蔽系统，以减少夏娃对秘密密钥的了解。然后，我们引入了一种简单的半决赛编程方法，以优化它们可以在屏蔽系统上执行的虚拟操作，以产生更高的关键速率，并在随机极化调制误差的情况下计算基本可实现的关键率。
The security of measurement device-independent quantum key distribution (MDI QKD) relies on a thorough characterization of one's optical source output, especially any noise in the state preparation process. Here, we provide an extension of the loss-tolerant protocol [Phys. Rev. A 90, 052314 (2014)], a leading proof technique for analyzing the security of QKD, to MDI QKD protocols that employ mixed signal states. We first reframe the core of the proof technique, noting its generalization to treat $d$-dimensional signal encodings. Concentrating on the qubit signal state case, we find that the mixed states can be interpreted as providing Alice and Bob with a virtual shield system they can employ to reduce Eve's knowledge of the secret key. We then introduce a simple semidefinite programming method for optimizing the virtual operations they can perform on the shield system to yield a higher key rate, along with an example calculation of fundamentally achievable key rates in the case of random polarization modulation error.
