A group of scientists from the Russian Quantum Center along with others from Russian cybersecurity startup QRate have announced two achievements that they contend will contribute to setting the world record for efficiency of classical post-processing algorithms for QKD. The first is a new protocol for the information reconciliation stage of quantum key distribution based on polar codes which makes them more resistant to environmental noise. The second is a method of reducing the portion of quantum-generated secret keys, that is consumed during the authentication procedure using a lightweight authentication protocol for QKD based on a ping-pong scheme for the QKD authenticity check. The group claims that this new method reduces the portion of quantum-generated secret keys consumed for the authentication purposes to below 1%. Together, the researchers say that these two developments will help provide the record efficiencies that they claim. Both developments have been published in the IEEE Xplore data base. You can find the paper on Blind Information Reconciliation With Polar Codes for Quantum Key Distribution here and the paper on Lightweight Authentication for Quantum Key Distribution here.
January 28, 2021