Anonymous quantum conference key agreement (AQCKA) allows a group of users within a network to establish a shared cryptographic key without revealing their participation. Although this can be achieved using bipartite primitives alone, it is costly in the number of network rounds required. By allowing the use of multi-partite entanglement, there is a substantial efficiency improvement. We experimentally implement the AQCKA task in a six-user quantum network using Greenberger–Horne–Zeilinger (GHZ)-state entanglement and obtain a significant resource cost reduction in line with theory when compared to a bipartite-only approach. We also demonstrate that the protocol retains an advantage in a four-user scenario with finite key effects taken into account.

中文翻译：

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实验性匿名量子会议


匿名量子会议密钥协议（AQCKA）允许网络内的一组用户建立共享密钥，而无需透露他们的参与情况。尽管这可以单独使用二分原语来实现，但所需的网络轮数成本很高。通过允许使用多部分纠缠，可以显着提高效率。我们使用 Greenberger-Horne-Zeilinger (GHZ) 态纠缠在六用户量子网络中实验性地实现了 AQCKA 任务，并且与仅二分方法相比，根据理论获得了显着的资源成本降低。我们还证明了该协议在考虑有限关键效应的四用户场景中保留了优势。