Figure3

Figure 3. The quantum (red arrow), service (blue arrow) and KMS (green arrow) channels of the QKD systems are connected via optical fibres. The connections established between each QKD system and the IT equipment are made by RJ45 (brown arrow). Within the server, various software containers are deployed, including the QMS, as well as the Web API container, which is managed by the management link (orange arrows). The QKD keys are pushed out of the QKD devices into the server using the ETSI GS QKD 014 REST API via the key delivery link (black arrow). KMS: Key management system; QKD: quantum key distribution; IT: information technology; QMS: Quantum Management System; API: application programming interface; STT GDC: Singapore Technologies Telemedia Global Data Centres.