As an essential ingredient of quantum networks, quantum conference key agreement (QCKA) provides unconditional secret keys among multiple parties, which enables only legitimate users to decrypt the encrypted message. Recently, some QCKA protocols employing twin-field was proposed to promote transmission distance. These protocols, however, suffer from relatively low conference key rate and short transmission distance over asymmetric channels, which demands a prompt solution in practice. Here, we consider a tripartite QCKA protocol utilizing the idea of sending-or-not-sending twin-field scheme and propose a high-efficiency QCKA over asymmetric channels by removing the symmetry parameters condition. Besides, we provide a composable finite-key analysis with rigorous security proof against general attacks by exploiting the entropic uncertainty relation for multiparty system. Our protocol greatly improves the feasibility to establish conference keys over asymmetric channels.

作为量子网络的重要组成部分，量子会议密钥协议（QCKA）在多方之间提供无条件的秘密密钥，只有合法用户才能解密加密消息。最近，一些采用双场的QCKA协议被提出来提高传输距离。然而，这些协议存在会议密钥速率较低、非对称信道传输距离短等问题，需要在实践中及时解决。在这里，我们考虑利用发送或不发送双场方案的思想的三方 QCKA 协议，并通过去除对称参数条件提出了一种在非对称信道上的高效 QCKA。除了，通过利用多方系统的熵不确定关系，我们提供了一个可组合的有限密钥分析，具有针对一般攻击的严格安全证明。我们的协议大大提高了在非对称信道上建立会议密钥的可行性。