TL;DR: Toshiba is a leading commercial QKD vendor, offering both discrete-variable (BB84) and continuous-variable QKD systems. Their systems have been deployed in financial institutions, government networks,
Toshiba is a leading commercial QKD vendor, offering both discrete-variable (BB84) and continuous-variable QKD systems. Their systems have been deployed in financial institutions, government networks, and critical infrastructure. Toshiba has demonstrated record-breaking QKD transmission rates and is working on network management software for multi-user QKD networks.
Protocol
BB84 with decoy states; continuous-variable QKD
Status
Commercially available; deployed in multiple countries