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Quantum key distribution (QKD) provides information-theoretic security in communications based on the laws of quantum physics. In this work, we report an implementation of quantumsecured data transmission in the infrastructure of Sberbank of Russia in standard communication lines in Moscow The experiment is realized on the basis of the already deployed urban fibre-optic communication channels with significant losses. We realize the decoy-state BB84 QKD protocol using the one-way scheme with polarization encoding for generating keys. Quantum-generated keys are then used for continuous key renewal in the hardware devices for establishing a quantum-secured VPN Tunnel between two offices of Sberbank. The used hybrid approach offers possibilities for longterm protection of the transmitted data, and it is promising for integrating into the already existing information security infrastructure.

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