论文标题
实验量子会议关键协议
Experimental quantum conference key agreement
论文作者
论文摘要
量子网络将在长距离上提供多节点纠缠，以在全球范围内实现安全的通信。传统的量子通信协议消耗了配对纠缠，这是涉及两个以上用户的分布式任务的次优。在这里，我们演示了量子会议密钥协议，这是一种量子通信协议，该协议利用多目标纠缠，以有效地在受约束网络中具有最高N-1速率优势的N用户之间创建相同的密钥。我们分发了由高光泽度，电信光子对来源产生的四个光子格林伯格 - 泽林格（GHz）状态，遍布高达50 km的光纤，从而在产生的原始钥匙上实现多用户误差校正和隐私放大。在有限键的分析下，我们建立了$ 1.15 \ times10^6 $位的安全密钥，这些密钥用于加密和安全地在会议传输中的四个用户之间共享图像。我们已经展示了一种针对多节点网络量身定制的新协议，该协议利用了GHz状态的低噪声，长距离传输，该协议将为将来的多党量子信息处理应用程序铺平道路。
Quantum networks will provide multi-node entanglement over long distances to enable secure communication on a global scale. Traditional quantum communication protocols consume pair-wise entanglement, which is sub-optimal for distributed tasks involving more than two users. Here we demonstrate quantum conference key agreement, a quantum communication protocol that exploits multi-partite entanglement to efficiently create identical keys between N users with up to N-1 rate advantage in constrained networks. We distribute four-photon Greenberger-Horne-Zeilinger (GHZ) states generated by high-brightness, telecom photon-pair sources across up to 50 km of fibre, implementing multi-user error correction and privacy amplification on resulting raw keys. Under finite-key analysis, we establish $1.15\times10^6$ bits of secure key, which are used to encrypt and securely share an image between the four users in a conference transmission. We have demonstrated a new protocol tailored for multi-node networks leveraging low-noise, long-distance transmission of GHZ states that will pave the way forward for future multiparty quantum information processing applications.
