Quantum Encryption
 

Cutting out the hype, they’ve demonstrated a method of using quantum entanglement encryption over existing FDDI commercial networks,to multiple users, using affordable equipment.

https://phys.org/news/2020-09-revolu...ves-safer.html

Revolutionary quantum breakthrough paves way for safer online communication

.......The team created a network for eight users using just eight receiver boxes, whereas the former method would need the number of users multiplied many times—in this case, amounting to 56 boxes. As the user numbers grow, the logistics become increasingly unviable—for instance 100 users would take 9,900 receiver boxes.

To demonstrate its functionality across distance, the receiver boxes were connected to optical fibres via different locations across Bristol and the ability to transmit messages via quantum communication was tested using the city's existing optical fibre network........