QKD Over Long Distance; Crucial to Data Security


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. 

“Sketch of the scheme used by Boaron et al. to demonstrate QKD over a record distance of 421 km. The setup uses an ultralow-loss (ULL) optical fiber, an electro-optical system with a high repetition rate (2.5 GHz), and a low-noise detection unit based on superconducting nanowire single-photon detectors (SNSPDs).” (Image Credit: APS/Alan Stonebraker)

Reference is found here at APS physics…


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