Finite-key Analysis for Quantum Conference Key Agreement with Asymmetric Channels

• URL: http://arxiv.org/abs/2109.11163v1
• Date: Thu, 23 Sep 2021 06:36:31 GMT
• Title: Finite-key Analysis for Quantum Conference Key Agreement with Asymmetric Channels
• Authors: Zhao Li, Xiao-Yu Cao, Chen-Long Li, Chen-Xun Weng, Jie Gu, Hua-Lei Yin, Zeng-Bing Chen
• Abstract summary: Quantum conference key agreement (QCKA) provides unconditional secret keys among multiple parties. Some QCKA protocols employing twin-field was proposed to promote transmission distance. Here, we consider a tripartite QCKA protocol utilizing the idea of sending-or-not-sending twin-field scheme.
• Score: 12.576252829963096
• License: http://creativecommons.org/licenses/by/4.0/
• Abstract: 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.

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