Article

Article title SECURITY OF SYNCHRONIZATION MODE OF QUANTUM KEYS DISTRIBUTION SYSTEM
Authors K.Y. Rumyantsev, A.P. Pljonkin
Section SECTION IV. SECURITY OF TELECOMMUNICATION SYSTEMS
Month, Year 05, 2015 @en
Index UDC 621.396.624
DOI
Abstract Investigations related to the two-pass аutocompensation quantum key distribution system (QKDS) of phase-encoded states of photons in the connecting mode. The synchronization signals are of a periodic sequence of optical pulses. Using photonic pulses and single-photon photodetectors provides enhanced protected from unauthorized access synchronization mode. Length of photon pulse and repetition period are assumed to be known. The time frame (period of following the optical pulses) are division to the many periods (a time windows). Each window is queried several times, determining sample size. Each time window survey fixed number of received photoelectrons and / or dark counts. The window in which recorded the maximum number of photoelectrons and dark counts is taken as a signal window. When analyzing the synchronization algorithm it is considered that the time of occurrence of the photon pulse is random. Taken into account that the photon pulse can simultaneously belong to two neighboring windows. Random processes in noise and signal time windows described by the Poisson law. Simulation of the synchronization process defined the limits of applicability of analytical expressions to calculate the probability of detecting the signal of the time window in sync QKDS for the two extreme cases, the appearance of the photon momentum: the photon momentum is completely within the analyzed time window or distributed between two adjacent windows. The estimation of the impact of the number of time windows and the relationship of the duration of the pulse to width of the time window on the detection probability in view of the appearance of a random photon pulse. It is shown that in order to reduce the time of uncertainty the duration of the time window should be 4 times the length of the photon momentum in the photon pulse duration of 1 ns, the repetition period of 1024 ns, the frequency of occurrence of dark counts pulses of 400 Hz, the average number of photoelectrons per photon pulse duration of 0.01 and a volume sample counts of registered pulses in each time window 200.

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Keywords Quantum key distribution systems; the photon pulse synchronization.
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