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Researchers at NTT and The University of Tokyo have analytically demonstrated that incorporating multiple preprocessing steps into tripartite GHZ state protocols can push the tolerable error threshold for quantum conference key agreement past 20 percent. This advancement significantly enhances protocol resilience against noise, overcoming previous limits around 11 to 15 percent by leveraging two-way classical communication without requiring complex iterative optimizations. The results provide a scalable pathway for deploying secure QCKA in practical future quantum networks where signal degradation is inevitable.

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Researchers Push Quantum Conference Key Agreement (QCKA) Past 20 per cent.

Quantum ZeitgeistJuly 19, 20266 min read

Security of Quantum Conference Key Agreement with Two-Way Classical Communication AUTHORS AND AFFILIATIONS: Shun Kawakami 1,2 , Mori Watanabe 3 , Takuya Ikuta 4 , Koichi Takasugi 1 1 Network Innovation Laboratories, NTT Inc., 1-1 Hikari-no-oka, Yokosuka, Kanagawa, 239-0847, Japan 2 NTT Research Center for Theoretical Quantum Information, NTT Inc., 3-1 Morinosato Wakamiya, Atsugi, Kanagawa, 243-0198, Japan 3 Department of Advanced Materials Science, Graduate School of Frontier Sciences, The University of Tokyo, 5-1-5 Kashiwanoha, Kashiwa, Chiba, 277-0882, Japan 4 Basic Research Laboratories, NTT Inc., 3-1 Morinosato Wakamiya, Atsugi, Kanagawa, 243-0198, Japan License: arXiv.org perpetual non-exclusive license [quant-ph] 05 Jul 2026 Security of Quantum Conference Key Agreement with Two-Way Classical Communication Quantum 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.

Researchers at NTT Inc. and The University of Tokyo have demonstrated a method to exceed a long-standing limitation in quantum communication, pushing the tolerable error threshold for quantum conference key agreement (QCKA) past 20 percent. The work details how incorporating “multiple B-steps and P-steps”, preprocessing procedures initially designed for bipartite quantum key distribution, into a tripartite GHZ state QCKA setup dramatically improves resilience against noise. This analytical derivation of a secure key rate reveals that iterative B-steps can elevate the tolerable error threshold beyond the approximately 11 percent limit previously achievable with standard QCKA, and beyond the approximately 15 percent threshold obtained with only a single…

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