量子安全千兆光接入网
Quantum secured gigabit optical access networks
摘要：
光接入网络通过共享光纤基础设施将多个端点连接到公共网络节点。它们将在量子密钥分发（QKD）网络中起到重要的作用。然而，在常用的无源网络架构中功率分配器的存在使得弱量子信号的成功传输具有挑战性。如果QKD和数据信号在无源网络中复用，则尤其如此。分束器引入了量子信号和拉曼噪声之间的不平衡，这会完全阻止量子信号的恢复。在这里，我们介绍了一种方法来克服这一限制，并演示了多用户QKD和全功率数据流量从千兆无源光网络（GPON）的共存。双馈线实现与标准GPON架构兼容，最多可支持128个用户，这表明量子保护的GPON网络在未来可能会很常见。
英文摘要：
Optical access networks connect multiple endpoints to a common network node via shared fibre infrastructure. They will play a vital role to scale up the number of users in quantum key distribution (QKD) networks. However, the presence of power splitters in the commonly used passive network architecture makes successful transmission of weak quantum signals challenging. This is especially true if QKD and data signals are multiplexed in the passive network. The splitter introduces an imbalance between quantum signal and Raman noise, which can prevent the recovery of the quantum signal completely. Here we introduce a method to overcome this limitation and demonstrate coexistence of multi-user QKD and full power data traffic from a gigabit passive optical network (GPON). The dual feeder implementation is compatible with standard GPON architectures and can support up to 128 users, highlighting that quantum protected GPON networks could be commonplace in the future.
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