User-independent optical path length compensation scheme with sub-nanosecond timing resolution for a 1×N quantum key distribution network system
- User-independent optical path length compensation scheme with sub-nanosecond timing resolution for a 1×N quantum key distribution network system
- 문성욱; 한상욱; 김용수; 조영욱; 박병권; 우민기
- Issue Date
- Photonics Research
- VOL 8, NO 3-302
- Quantum key distribution (QKD) networks constitute promising solutions for secure communication. Beyond conventional point-to-point QKD, we developed 1 × 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 × 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 × 4 QKD network system using the fiber network of a metropolitan area.
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