2020/02/24 by Hua-Lei Yin, Hua‐Lei Yin, Zeng-Bing Chen +1
Computer Science · Mathematics · Physics and Astronomy · #BB84 #Basis (linear algebra) #Computer science #Computer security #Key (lock) #Mathematics #Physics #Protocol (science) #Quantum #Quantum Computing Algorithms and Architecture #Quantum Information and Cryptography #Quantum Mechanics and Applications #Quantum cryptography #Quantum information #Quantum key distribution #Quantum mechanics #Simple (philosophy) #Theoretical computer science #quant-ph
paper · pdf · doi:10.1364/ol.387877
published as Opt. Lett. 45, 1627 (2020) · This protocol cannot resist coherent attacks with the current phase error rate
openalex publication_date 2020/02/24 · openalex created_date 2020/03/06 · arxiv created 2020/06/18 · arxiv updated 2020/06/19 · openalex updated_date 2026/08/05
The BB84-based quantum key distribution system is limited in high-speed and chip integration due to the requirement of preparing and measuring four states. Recently, the simplified BB84 protocol with preparation and measurement of only three states has showed the approximate secret key rate with standard BB84. However, the security proof is valid only under the collective attack and requires the basis-independent detection efficiency condition. Here, we provide a security proof against the coherent attack, which simultaneously removes the basis-independent detection efficiency condition. Importantly, the phase error rate formula is quite simple through subtle observation. We expect that the simplified BB84 protocol with the decoy-state method can be implemented widely in reality.