Park, Byung Kwon Woo, Min Ki Kim, Yong-Su Cho, Young-Wook Moon, Sung Han, Sang-Wook 2024-01-19T18:01:59Z 2024-01-19T18:01:59Z 2021-09-05 2020-03-01 2327-9125 https://pubs.kist.re.kr/handle/201004/118871 Quantum key distribution (QKD) networks constitute promising solutions for secure communication. Beyond conventional point-to-point QKD, we developed 1 x N QKD network systems with a sub-nanosecond resolution optical path length compensation scheme. With a practical plug-and-play QKD architecture and compact timing control modules based on a field-programmable gate array, we achieved long-term stable operation of a 1 x 64 QKD network system. Using this architecture, 64 users can simultaneously share secret keys with one server, without using complex software algorithms and expensive hardware. We demonstrated the workings of a 1 x 4 QKD network system using the fiber network of a metropolitan area. (C) 2020 Chinese Laser Press English OPTICAL SOC AMER FIELD-TEST CRYPTOGRAPHY PLUG User-independent optical path length compensation scheme with sub-nanosecond timing resolution for a 1 x N quantum key distribution network system Article 10.1364/PRJ.377101 1 PHOTONICS RESEARCH, v.8, no.3, pp.296 - 302 PHOTONICS RESEARCH 8 3 296 302 scie scopus 000518396900011 2-s2.0-85081113462 Optics Optics Article FIELD-TEST CRYPTOGRAPHY PLUG