Recommendation ITU-T Y.3818 specifies functional architecture models for quantum key distribution network interworking (QKDNi), i.e., functional architectures with gateway and interworking nodes. In order to realize these two models, Recommendation ITU-T Y.3818 specifies detailed functional elements, basic operational procedures and architectural configurations for QKDNi. Corrigendum 1 corrects the following editorial errors. To add Qqc to Quantum layer in Figure 3 - 8.

Type of work item was changed at the SG13 plenary, 28 October 2025, from Revision to Corrigendum.