资源有效的量子密钥分发：帕多瓦市中心的现场试验
Resource-effective Quantum Key Distribution: a field-trial in Padua city center
摘要：
实地试验对于寻求商业化和广泛采用的新技术至关重要。量子密钥分发（QKD）当然也是如此，它允许远程方提取具有无条件安全性的秘密密钥。通常，城市基础设施上的QKD演示需要复杂的稳定和同步系统，以随时间保持低量子比特错误（QBER）和高密钥速率。在这里，我们提出了一个现场试验，利用低复杂度的自稳定硬件和一种新的同步技术，在光纤上进行量子密钥分配部署在意大利帕多瓦市中心。特别是，我们的研究小组最近推出的两种技术进行了评估，在现实世界的环境中：iPOGNAC偏振编码器用于准备的量子态，而时间同步使用Qubit4Sync算法进行。这里提出的结果表明，我们的资源有效的QKD系统的有效性和鲁棒性，可以轻松，快速地安装在现有的电信基础设施，从而代表了成熟，高效和低成本的QKD系统的重要一步。
英文摘要：
Field-trials are of key importance for novel technologies seeking commercialization and wide-spread adoption. This is certainly also the case for Quantum Key Distribution (QKD), which allows distant parties to distill a secret key with unconditional security. Typically, QKD demonstrations over urban infrastructures require complex stabilization and synchronization systems to maintain a low Quantum Bit Error (QBER) and high secret key rates over time. Here we present a field-trial which exploits a low-complexity self-stabilized hardware and a novel synchronization technique, to perform QKD over optical fibers deployed in the city center of Padua, Italy. In particular, two techniques recently introduced by our research group are evaluated in a real-world environment: the iPOGNAC polarization encoder was used for the preparation of the quantum states, while the temporal synchronization was performed using the Qubit4Sync algorithm. The results here presented demonstrate the validity and robustness of our resource-effective QKD system, that can be easily and rapidly installed in an existing telecommunication infrastructure, thus representing an important step towards mature, efficient and low-cost QKD systems.
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