2006/10/31 by Yoritoshi Adachi, Takashi Yamamoto, Masato Koashi +1 · 8 citations
Computer Science · Mathematics · Physics and Astronomy · #Algorithm #Computer science #Computer security #Cryptography #Detector #Key (lock) #Key generation #Mathematics #Optics #Parametric statistics #Photon #Physics #Protocol (science) #Quantum #Quantum Computing Algorithms and Architecture #Quantum Information and Cryptography #Quantum Mechanics and Applications #Quantum cryptography #Quantum entanglement #Quantum information #Quantum key distribution #Quantum mechanics #Simple (philosophy) #Spontaneous parametric down-conversion #Statistical physics #Statistics #Telecommunications #Topology (electrical circuits) #quant-ph
paper · pdf · doi:10.1103/physrevlett.99.180503
published as Phys. Rev. Lett. 99, 180503 (2007) · 5 pages, 2 figures; published version in Phys. Rev. Lett
openalex publication_date 2007/11/02 · arxiv created 2007/11/06 · arxiv updated 2009/12/01 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/05
We propose an efficient quantum key distribution protocol based on the photon-pair generation from parametric down-conversion (PDC). It uses the same experimental setup as the conventional protocol, but a refined data analysis enables detection of photon-number splitting attacks by utilizing information from a built-in decoy state. Assuming the use of practical detectors, we analyze the unconditional security of the new scheme and show that it improves the secure key generation rate by several orders of magnitude at long distances, using a high intensity PDC source.