2012/11/20 by Kanak Patel, K. A. Patel, J. F. Dynes +8 · 5 citations
Computer Science · Engineering · Physics and Astronomy · #Computer network #Computer science #Electronic engineering #Engineering #Noise (video) #Optical fiber #Optics #Photon #Physics #Quantum #Quantum Information and Cryptography #Quantum Mechanics and Applications #Quantum cryptography #Quantum information #Quantum key distribution #Quantum optics and atomic interactions #Telecommunications #quant-ph
paper · pdf · doi:10.1103/physrevx.2.041010
published as Physical Review X 2, 041010 (2012) · 7 pages, 5 figures
openalex publication_date 2012/11/20 · arxiv created 2012/11/30 · arxiv updated 2012/12/04 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/05
Quantum key distribution (QKD) uniquely allows the distribution of cryptographic keys with security verified by quantum mechanical limits. Both protocol execution and subsequent applications require the assistance of classical data communication channels. While using separate fibers is one option, it is economically more viable if data and quantum signals are simultaneously transmitted through a single fiber. However, noise-photon contamination arising from the intense data signal has severely restricted both the QKD distances and secure key rates. Here, we exploit a novel temporal-filtering effect for noisephoton rejection. This allows high-bit-rate QKD over fibers up to 90 km in length and populated with error-free bidirectional Gb=s data communications. With a high-bit rate and range sufficient for important information infrastructures, such as smart cities and 10-Gbit Ethernet, QKD is a significant step closer toward wide-scale deployment in fiber networks.