COMMUNICATION DEVICE, COMMUNICATION METHOD AND COMMUNICATION SYSTEM

• Main Author: TANIZAWA YOSHIMICHI
• Format: Patent
• Language: English; Japanese
• Published: 08.03.2018
• Subjects: ELECTRIC COMMUNICATION TECHNIQUE; ELECTRICITY; TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHICCOMMUNICATION

PROBLEM TO BE SOLVED: To improve reliability of a communication system using a quantum key delivery technology.SOLUTION: A communication device comprises a plurality of quantum key delivery parts, a plurality of communication parts, a monitoring part and a switching part. A key delivery part has a quantum key delivery function to share a quantum key with an external delivery device. A communication part communicates with the external communication device by using a quantum key. The monitoring part monitors an operation state which is at least one among a light quantum transmission/receiving state in the quantum key delivery function, a quantum key generation state and a quantum key acquisition state. The switching part switches a control object which is either of a key delivery part or a communication part from a first control object to a second control object which is other than the first control object.SELECTED DRAWING: Figure 7 【課題】量子鍵配送技術を用いた通信システムの信頼性を向上させる。【解決手段】通信装置は、複数の鍵配送部と、複数の通信部と、監視部と、切替部と、を備える。鍵配送部は、外部配送装置との間で量子鍵を共有する量子鍵配送機能を有する。通信部は、量子鍵を用いて外部通信装置と通信する。監視部は、量子鍵配送機能における光子の送受信状況、量子鍵の生成状況、および、量子鍵の取得状況、の少なくとも１つである稼働状況を監視する。切替部は、稼働状況に応じて、鍵配送部および通信部のいずれかである制御対象を、第１制御対象から、第１制御対象以外の第２制御対象に切り替える。【選択図】図７