International banking consortia are expanding live trials of quantum key distribution (QKD) across fiber-optic networks. The deployments aim to establish post-quantum security measures for high-value financial transaction routing before commercial quantum computers arrive.
Infrastructure Constraints and Hybrid Protocols
Current QKD implementations are limited by signal attenuation in optical fibers over long distances without trusted nodes. Financial institutions are testing hybrid models combining hardware-level quantum key exchange with post-quantum cryptographic software algorithms.