Two-Way Classical Communication Boosts Error Tolerance in Quantum Conference Key Agreement
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[Submitted on 5 Jul 2026]
Summary
This paper analyzes the security of Quantum Conference Key Agreement (QCKA) using two-way classical communication with tripartite GHZ states and two measurement bases. It builds on Gottesman and Lo's preprocessing procedures (B-step and P-step) originally developed for bipartite QKD. The authors derive secure key rates analytically and demonstrate that iterative B-steps can increase the tolerable error threshold beyond 20%, significantly improving upon the ~11% threshold without two-way classical communication and the ~15% threshold with a single B-step. The findings show that two-way classical communication substantially enhances the robustness of practical QCKA protocols for multi-user quantum networks.
Source
bskyTwo-Way Classical Communication Boosts Error Tolerance in Quantum Conference Key Agreementarxiv.orgKey quotes
Ā· 3 pulledQuantum conference key agreement (QCKA) enables multiple users to establish a common secret key with information-theoretic security and is regarded as a key primitive for secure communication in future quantum networks.
We derive the corresponding secure key rate analytically and demonstrate that iterative B-steps can increase the tolerable error threshold beyond 20%, significantly improving upon the approximately 11% threshold achievable without two-way classical communication.
Our results show that two-way classical communication can substantially enhance the robustness of practical QCKA protocols.
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