在具有上转换模块的部署光纤上实现完全成熟的量子和经典通信
Towards fully-fledged quantum and classical communication over deployed fiber with up-conversion module
摘要：
量子密钥分发（QKD），即分发用于数据加密的量子安全密钥，预计将在未来几十年产生至关重要的影响。然而，尽管在过去的二十年中取得了显着的成就，但许多实际和严重的挑战限制了这种新型量子技术在当前电信基础设施中的全面部署。特别是，由于经典信号的高强度引起的固有噪声，量子信号和高速数据业务在同一光纤内的共同传播没有完全解决。因此，当前的共同传播方案限制了经典光功率的量，以便降低整体链路噪声。然而，这种自组织解决方案限制了大规模QKD部署的整体可能性范围。在这里，我们提出并证明了一种新的方法，基于上变频辅助接收器，共传播的经典光和量子密钥分配信号。此外，我们比较了该方案的性能与现成的量子接收器，配备了标准的InGaAs探测器，在不同长度的安装光纤链路。与标准接收机相比，我们的方案具有更高的噪声容忍度，从而使密钥的分配在4 dB以上的经典功率的条件下。
英文摘要：
Quantum key distribution (QKD), the distribution of quantum secured keys useful for data encryption, is expected to have a crucial impact in the next decades. However, although the notable achievements accomplished in the last twenty years, many practical and serious challenges are limiting the full deployment of this novel quantum technology in the current telecommunication infrastructures. In particular, the co-propagation of quantum signals and high-speed data traffic within the same optical fiber, is not completely resolved, due to the intrinsic noise caused by the high intensity of the classical signals. As a consequence, current co-propagation schemes limit the amount of classical optical power in order to reduce the overall link noise. However, this ad-hoc solution restrains the overall range of possibilities for a large-scale QKD deployment. Here, we propose and demonstrate a new method, based on up-conversion assisted receiver, for co-propagating classical light and QKD signals. In addition, we compare the performances of this scheme with an off-the-shelf quantum receiver, equipped with a standard InGaAs detector, over different lengths of an installed fiber link. Our proposal exhibits higher tolerance for noise in comparison to the standard receiver, thus enabling the distribution of secret keys in the condition of 4 dB-higher classical power.
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