In 2023, in preparation for a post-quantum world, we will see a macrotrend emerge with adoption of QKD in datacenters, IoT, autonomous systems, and 6G,” Centoni wrote.

Source: https://www.networkworld.com/article/3684772/former-vmware-exec-gillis-resurfaces-to-run-cisco-security-business-again.html

Instead, quantum networks today are largely used for quantum key distribution (QKD), which uses quantum mechanics to secure the transmission of symmetric encryption keys.

Source: https://www.networkworld.com/article/3691296/commercial-quantum-networks-inch-closer-to-primetime.html

QKD systems use a transmitter to send the encoded photons and a to detect them.

Source: https://phys.org/news/2023-05-chip-based-quantum-key-higher-transmission.html