2026-01-28 株式会社東芝
図1： 衛星QKDと光ファイバーQKDによる大陸横断量子ネットワーク
＜関連情報＞
- https://www.global.toshiba/jp/technology/corporate/rdc/rd/topics/26/2601-02.html
- https://www.science.org/doi/10.1126/sciadv.adj5873
模擬衛星高架橋内でのリアルタイムギガヘルツ自由空間量子鍵配布 Real-time gigahertz free-space quantum key distribution within an emulated satellite overpass
Thomas Roger, Ravinder Singh, Chithrabhanu Perumangatt, Davide G. Marangon, […] , and Andrew J. Shields
Science Advances Published:1 Dec 2023
DOI:https://doi.org/10.1126/sciadv.adj5873
Abstract
Satellite quantum key distribution (SatQKD) intermediated by a trusted satellite in a low-Earth orbit to ground stations along the satellite’s path allows remote users to connect securely. To establish a secure connection, a SatQKD session must be conducted to each user over a dynamically changing free-space link, all within just a few hundred seconds. Because of the short time and large losses under which the QKD protocol will be implemented, it has not yet been possible to form a complete key by transmitting all the relevant information required within a single overpass of the satellite. Here, we demonstrate a real-time QKD system that is capable of forming a 4.58-megabit secure key between two nodes within an emulated satellite overpass. We anticipate that our system will set the stage for practical implementations of intercontinental quantum secure communications that can operate over large networks of nodes and enable the secure transmission of data globally.
