Synchronization in Quantum Key Distribution Systems

TL;DR

This paper investigates the synchronization process in quantum key distribution systems, proposing a new synchronization algorithm, analyzing detector parameters, and simulating system performance to enhance secure quantum communication.

Contribution

It introduces a novel synchronization algorithm for QKD systems that accounts for detector recovery time and provides a detailed analysis of system parameters affecting synchronization.

Findings

Synchronization algorithm effectively restores detector operation after photon detection.

Detector parameters significantly influence synchronization accuracy.

Simulation results validate the proposed synchronization method's effectiveness.

Abstract

In the description of quantum key distribution systems, much attention is paid to the operation of quantum cryptography protocols. The main problem is the insufficient study of the synchronization process of quantum key distribution systems. This paper contains a general description of quantum cryptography principles. A two-line fiber-optic quantum key distribution system with phase coding of photon states in transceiver and coding station synchronization mode was examined. A quantum key distribution system was built on the basis of the scheme with automatic compensation of polarization mode distortions. Single-photon avalanche diodes were used as optical radiation detecting devices. It was estimated how the parameters used in quantum key distribution systems of optical detectors affect the detection of the time frame with attenuated optical pulse in synchronization mode with respect to its probabilistic and time-domain characteristics. A design method was given for the process that detects the time frame that includes an optical pulse during synchronization. This paper describes the main quantum communication channel attack methods by removing a portion of optical emission. This paper describes the developed synchronization algorithm that takes into account the time required to restore the photodetectors operation state after the photon has been registered during synchronization. The computer simulation results of the developed synchronization algorithm were analyzed...