2021/03/17 by Xiao-Yu Cao, Jie Gu, Yu-Shuo Lu +2
Computer Science · Physics and Astronomy · #Coherent states #Field (mathematics) #Key (lock) #Limit (mathematics) #Protocol (science) #Quantum #Quantum Computing Algorithms and Architecture #Quantum Information and Cryptography #Quantum Mechanics and Applications #Quantum error correction #Quantum information science #Quantum key distribution #Quantum network #cs.CR #quant-ph
paper · pdf · doi:10.1088/1367-2630/abef98
published as New J. Phys. 23, 043002 (2021) · 6 pages, 4 figures
openalex publication_date 2021/03/17 · openalex created_date 2021/04/13 · arxiv created 2021/09/06 · arxiv updated 2021/09/07 · openalex updated_date 2026/08/05
Abstract Quantum conference key agreement (CKA) enables key sharing among multiple trusted users with information-theoretic security. Currently, the key rates of most quantum CKA protocols suffer from the limit of the total efficiency among quantum channels. Inspired by the coherent one-way and twin-field quantum key distribution (QKD) protocols, we propose a quantum CKA protocol of three users. Exploiting coherent states with intensity 0 and μ to encode logic bits, our protocol can break the limit. Additionally, the requirements of phase randomization and multiple intensity modulation are removed in our protocol, making its experimental demonstration simple.