QKD Over Long Distance; Crucial to Data Security. Quantum Key Distribution, QKD, utilizes photon entanglement to distribute encryption keys with near-total security. Research conducted at the University of Geneva has taken QKD to new lengths, literally. Though only a small gain in distance has been achieved over the 404KM record, the 421KM distance attained showed improvements elsewhere. Namely, in encryption key-rate throughput – a much needed aspect to enabling QKD in the high-speed communication networks today. Security, distance, and key rate must all be considered. These studies are sorting out each of these aspects for the optimal QKD system.
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Reference is found here at APS physics…