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Synchronization system for quantum key distribution devices
Russian version
N.V. Rudavin1,2, V.Y. Iashchuk1, A.A. Feimov1,3, R.V. Ozhegov 3,2, R.A. Shakhovoy1,3
1QRate, Skolkovo, Russia
2National Research University Higher School of Economics, Moscow, Russia
3NTI Center for Quantum Communications, National University of Science and Technology MISiS, Moscow, Russia
Email: n.rudavin@goqrate.com
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In commercial quantum key distribution (QKD) systems, high synchronization accuracy between the reference oscillators of the transmitter and receiver plays a key role in ensuring proper operation. An implementation of a frequency difference correction system for a QKD device is proposed. The paper describes in detail an optical synchronization scheme, two-stage frequency correction method and noise-resistant method for automatic determination of the quantum state reception and transmission start time on the receiver and transmitter. To validate the proposed technical solutions, a series of experiments was carried out using a real QKD device implementing the BB84 protocol. As a result, stable operation of all components of the proposed frequency difference correction system was demonstrated. Stabilization accuracy provides reliable distribution of secret keys between remote nodes. Keywords: reference oscillator stability, frequency synthesizer, time and wavelength division multiplexing, metastability, phase error, M sequence, synchronization, quantum key distribution.
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