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Quantum key distribution (QKD) provides theoretic information security incommunications based on the laws of quantum physics. In this work, we report animplementation of quantum-secured data transmission in the infrastructure ofSberbank of Russia in standard communication lines in Moscow. The experiment isrealized on the basis of already deployed urban fiber-optics communicationchannels with significant losses. We realize the decoy-state BB84 QKD protocolusing the one-way scheme with polarization encoding for generating keys.Quantum-generated keys are then used for continuous key renewal in the hardwaredevices for establishing a quantum-secured VPN Tunnel between two offices ofSberbank. The hybrid approach used offers possibilities for long-termprotection of the transmitted data; it is promising for integrating into thealready existing information security infrastructure.

Quantum-secured data transmission in urban fibre-optic communication lines