Long-Range QKD without Trusted Nodes is Not Possible with Current Technology

Understand

A recently published patent (https://www.ipo.gov.uk/p-ipsum/Case/PublicationNumber/GB2590064) has claimed the development of a novel quantum key distribution protocol purporting to achieve long-range quantum security without trusted nodes and without use of quantum repeaters.

• Here we present a straightforward analysis of this claim, and reach the conclusion that it is largely unfounded.