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<p>In this work, we prove security of a quantum conference key agreement (QCKA) protocol augmented with a classical advantage distillation (CAD) protocol. We derive a proof of security, in the finite key setting, that is able to bound the secure key rate for any general, coherent, attack. We evaluate the performance of the system, showing our result can improve the noise tolerance of the protocol in some, but not all, scenarios. Specifically, our work can improve key rates in network scenarios where users are not located at equal distances, and where there are asymmetries in the error rate between parties.</p>

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Quantum conference key agreement with classical advantage distillation

  • 期刊论文

  • 出版模式：

    开放获取

  • 发表日期：

    2025年10月5日

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  • Walter O. Krawec

摘要

In this work, we prove security of a quantum conference key agreement (QCKA) protocol augmented with a classical advantage distillation (CAD) protocol. We derive a proof of security, in the finite key setting, that is able to bound the secure key rate for any general, coherent, attack. We evaluate the performance of the system, showing our result can improve the noise tolerance of the protocol in some, but not all, scenarios. Specifically, our work can improve key rates in network scenarios where users are not located at equal distances, and where there are asymmetries in the error rate between parties.