Fecha del artículo: 18th March 2019 https://www.idquantique.com/sk-telecom-continues-to-protect-its-5g-network-w...
"Moreover, SK Telecom plans to install QRNG to AuC of its LTE network in April 2019.
Next month, SK Telecom will also apply ID Quantique’s Quantum Key Distribution (QKD) technology to the Seoul-Daejeon section of its 5G and LTE networks, to strengthen the security of 5G and LTE data transmission and reception. This is the section of the network with the most data traffic concentration in Korea."
Esto es interesante: https://epjquantumtechnology.springeropen.com/articles/10.1140/epjqt/s40507-... El artículo de Nature está disponible en sci-hub ;-) Abstract: Quantum key distribution (QKD)1,2 has the potential to enable secure communication and information transfer3 . In the laboratory, the feasibility of point-to-point QKD is evident from the early proof-of-concept demonstration in the laboratory over 32 centimetres4 ; this distance was later extended to the 100-kilometre scale5,6 with decoy-state QKD and more recently to the 500-kilometre scale7–10 with measurementdevice-independent QKD. Several small-scale QKD networks have also been tested outside the laboratory11–14. However, a global QKD network requires a practically (not just theoretically) secure and reliable QKD network that can be used by a large number of users distributed over a wide area15. Quantum repeaters16,17 could in principle provide a viable option for such a global network, but they cannot be deployed using current technology18. Here we demonstrate an integrated space-to-ground quantum communication network that combines a large-scale fbre network of more than 700 fbre QKD links and two high-speed satellite-to-ground free-space QKD links. Using a trusted relay structure, the fbre network on the ground covers more than 2,000 kilometres, provides practical security against the imperfections of realistic devices, and maintains long-term reliability and stability. The satellite-to-ground QKD achieves an average secret-key rate of 47.8 kilobits per second for a typical satellite pass—more than 40 times higher than achieved previously. Moreover, its channel loss is comparable to that between a geostationary satellite and the ground, making the construction of more versatile and ultralong quantum links via geosynchronous satellites feasible. Finally, by integrating the fbre and free-space QKD links, the QKD network is extended to a remote node more than 2,600 kilometres away, enabling any user in the network to communicate with any other, up to a total distance of 4,600 kilometres. Conclusiones: Discussion and conclusion We have presented a practical large-scale quantum network that consists of four QMANs, a national-scale backbone and a satellite–ground network. This work shows that quantum technology is sufficiently mature for practical applications. A global quantum network can be realized by connecting more national quantum networks from different countries via ground connections or ground–satellite links. With developments in manipulating quantum signals between remote parties, future work could extend to new QKD schemes such as measurement-device-independent QKD38, twin-field QKD39 or generic quantum communication protocols. By combining measurement-device-independent QKD and well calibrated devices, practical QKD systems could provide sufficient security under realistic conditions3 . Our backbone network can be updated directly to adopt these new schemes. First, measurement-device-independent QKD is well suited for star-type quantum access metropolitan networks21,40. The star-type topology is the key structure in our four metropolitan networks (Fig. 1). Second, the decoy-state transmitters for measurement-device-independent QKD and BB84 are essentially the same38. Hence, the transmitter systems in the current fibre network can also be used to realize the measurement-device-independent QKD network. Finally, it will be interesting to investigate the experimental implementation of twin-field QKD in the backbone network for long-distance transmission. Furthermore, with the extension of the backbone, more sophisticated topology (including a complete loop) will be formed, enabling possibilities such as secure time-frequency transfer41, fundamental tests of quantum gravity42 and large-scale interferometry for metrology applications43,44. With the development of quantum memory18, it might also be possible to realize distributed quantum computing45 and quantum repeaters16,17 over large areas in the near future. (los números que aparecen en el texto son debidos a las referencias del texto original). -- Saludos, miguel Los agujeros negros son lugares donde dios dividió por cero. Black holes are places where god divided by zero. Steven Wright