论文标题
相匹配量子密码会议
Phase-Matching Quantum Cryptographic Conferencing
论文作者
论文摘要
量子加密会议（QCC）有望在长距离内在多个用户中分发信息理论安全键。受Greenberger-Horne-Zeilinger（GHz）状态的脆弱性的限制，QCC网络基于直接分配GHz状态的长距离仍面临巨大挑战。另一种潜在的方法是测量设备独立的QCC和会议密钥协议与单光子干扰，这是基于GHz状态后选择后和W状态的选择后提出的。但是，以前协议的实现仍然受到光通道的传输速率$η$的严重限制，以及用于选择后GHz状态的设置的复杂性。同时，后一种协议不能被施加到测量设备独立的准备和测量方案中。结合了选择后的GHz状态和最近提出的双场量子键分布协议的想法，我们报告了基于弱相干状态干扰物的QCC协议，名为相匹配的量子加密会议，这对所有检测器侧通道攻击都不受欢迎。与测量设备独立的QCC协议相比，提出的协议可以将关键生成率从$ \ mathrm {o}（η^n）$提高到$ \ mathrm {o}（η^{n-1}）$。同时，由于其简单的设置，它可以轻松地扩展到多方。
Quantum cryptographic conferencing (QCC) holds promise for distributing information-theoretic secure keys among multiple users over long distance. Limited by the fragility of Greenberger-Horne-Zeilinger (GHZ) state, QCC networks based on directly distributing GHZ states at long distance still face big challenge. Another two potential approaches are measurement device independent QCC and conference key agreement with single-photon interference, which was proposed based on the post-selection of GHZ states and the post-selection of W state, respectively. However, implementations of the former protocol are still heavily constrained by the transmission rate $η$ of optical channels and the complexity of the setups for post-selecting GHZ states. Meanwhile, the latter protocol cannot be cast to a measurement device independent prepare-and-measure scheme. Combining the idea of post-selecting GHZ state and recently proposed twin-field quantum key distribution protocols, we report a QCC protocol based on weak coherent state interferences named phase-matching quantum cryptographic conferencing, which is immune to all detector side-channel attacks. The proposed protocol can improve the key generation rate from $\mathrm{O}(η^N)$ to $\mathrm{O}(η^{N-1})$ compared with the measurement device independent QCC protocols. Meanwhile, it can be easily scaled up to multiple parties due to its simple setup.
