Quantum cryptography keys for secure communication distributed 1,000 kilometers farther than previous attempts
Tuesday, June 16, 2020 - 08:20
in Physics & Chemistry
The exchange of a secret key for encrypting and decrypting messages over a distance of 1,120 kilometers is reported in Nature this week. This achievement is made using entanglement-based quantum key distribution, a theoretically secure communication technique. Previous attempts to directly distribute quantum keys between two ground users under real-world conditions have reached distances of only around 100 kilometers.