Title: Demonstration of a quantum key distribution network in urban fibre-optic communication lines,
Abstract: We report the results of the implementation of a quantum key distribution
(QKD) network using standard fibre communication lines in Moscow. The developed
QKD network is based on the paradigm of trusted repeaters and allows a common
secret key to be generated between users via an intermediate trusted node. The
main feature of the network is the integration of the setups using two types of
encoding, i.e. polarisation encoding and phase encoding. One of the possible
applications of the developed QKD network is the continuous key renewal in
existing symmetric encryption devices with a key refresh time of up to 14 s.