2005/11/22 by Jérôme Lodewyck, Thierry Debuisschert, Rosa Tualle-Brouri +1 · 3 citations
Computer Science · Physics and Astronomy · #Quantum Information and Cryptography #Quantum Mechanics and Applications #Quantum optics and atomic interactions #quant-ph
paper · pdf · doi:10.1103/physreva.72.050303
published as PRA, 72, 050303(R) (2005) · 5 pages, 4 figures
openalex publication_date 2005/11/22 · arxiv created 2005/12/01 · arxiv updated 2009/12/01 · openalex created_date 2016/06/24 · openalex updated_date 2026/07/28
We describe a continuous-variable coherent-states quantum-key distribution system working at 1550\phantom\rule0.3em0exnm, and entirely made of standard fiber optics and telecommunications components, such as integrated-optics modulators, couplers and fast InGaAs photodiodes. The setup is composed of an emitter randomly modulating a coherent state in the complex plane with a doubly Gaussian distribution, and a receiver based on a shot-noise limited time-resolved homodyne detector. By using a reverse reconciliation protocol, the device can transfer a raw key rate up to 1\phantom\rule0.3em0exMbit∕s, with a proven security against Gaussian or non-Gaussian attacks. The dependence of the secret information rate of the present fiber setup is studied as a function of the line transmission and excess noise.