2017/06/21 by Masahiro Takeoka, Kaushik P. Seshadreesan, Mark M. Wilde · 26 citations
Computer Science · Mathematics · Physics and Astronomy · #Channel (broadcasting) #Communication source #Computer network #Computer science #Computer security #Entanglement distillation #Key (lock) #Mathematics #Physics #Quantum #Quantum Computing Algorithms and Architecture #Quantum Information and Cryptography #Quantum Mechanics and Applications #Quantum capacity #Quantum channel #Quantum entanglement #Quantum information science #Quantum key distribution #Quantum mechanics #Quantum network #Squashed entanglement #Topology (electrical circuits) #quant-ph
paper · pdf · doi:10.1103/physrevlett.119.150501
published in Physical Review Letters 119(15), 150501 (American Physical Society) · 9 pages, 5 figures
arxiv created 2017/06/21 · openalex publication_date 2017/10/13 · arxiv updated 2018/03/13 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/05
We consider quantum key distribution (QKD) and entanglement distribution using a single-sender multiple-receiver pure-loss bosonic broadcast channel. We determine the unconstrained capacity region for the distillation of bipartite entanglement and secret key between the sender and each receiver, whenever they are allowed arbitrary public classical communication. A practical implication of our result is that the capacity region demonstrated drastically improves upon rates achievable using a naive time-sharing strategy, which has been employed in previously demonstrated network QKD systems. We show a simple example of a broadcast QKD protocol overcoming the limit of the point-to-point strategy. Our result is thus an important step toward opening a new framework of network channel-based quantum communication technology.