论文标题
克服量子会议关键协议的基本界限
Overcoming fundamental bounds on quantum conference key agreement
论文作者
论文摘要
双场量子钥匙分布（TF-QKD）使两个遥远的各方通过干扰中级测量站中的弱相干脉冲（WCP）来建立共享的秘密钥匙。这使TF-QKD比传统的QKD方案达到更大的距离，并使其成为唯一能够击败双方私人容量无关的计划。在这里，我们将TF-QKD推广到多部分方案。具体来说，我们提出了一个仅使用WCP和线性光学的实用会议密钥协议（CKA）协议，并通过多方诱饵状态方法证明其安全性。我们的协议允许任意数量的当事方通过单光量干扰建立秘密会议密钥，从而使其能够克服最新的界限，以在没有中继器的情况下在量子网络中建立会议密钥的速率。
Twin-Field Quantum Key Distribution (TF-QKD) enables two distant parties to establish a shared secret key, by interfering weak coherent pulses (WCPs) in an intermediate measuring station. This allows TF-QKD to reach greater distances than traditional QKD schemes and makes it the only scheme capable of beating the repeaterless bound on the bipartite private capacity. Here, we generalize TF-QKD to the multipartite scenario. Specifically, we propose a practical conference key agreement (CKA) protocol that only uses WCPs and linear optics and prove its security with a multiparty decoy-state method. Our protocol allows an arbitrary number of parties to establish a secret conference key by single-photon interference, enabling it to overcome recent bounds on the rate at which conference keys can be established in quantum networks without a repeater.
