Authors K.Yu. Rumyantsev, A.P. Pljonkin
Month, Year 09, 2016 @en
Index UDC 621.396.624
DOI 10.18522/2311-3103-2016-9-415
Abstract The synchronization mode of quantum key distribution system (QKDS) with phase coding states of photons on the basis of single-photon avalanche photodiodes (SPAD) is investigated. Shown is the effect of the probability of detection and temporal characteristics of the signal duration of the time window in the single-photon synchronization. The purpose of research is to evaluate the influence of SPAD parameters on probabilistic and temporal characteristics of the signal detector time window in single-photon regime QKDS synchronization. Proven is the possibility of the use of previously obtained analytical expressions for the calculation of the probability of correct detection of the signal in the time window during synchronization when used as avalanche photodetectors. A new synchronization algorithm is proposed, it takes into account in the process of detection of the optical pulse time to restore the operating state of a photon SPAD after registration. Given is the technique of designing an optical pulse detection process during synchronization with the account of features of application SPAD as registrars of single photons. Proposed is a search algorithm signal time window, suggesting the division of the repetition period of the optical pulses in the time windows. The peculiarity of the test synchronization algorithm is that it is implemented in a single-photon regime with the registration of photons, increasing the safety synchronization mode. Given is the analysis of the parameters used in the distribution systems, quantum optical key APD and their impact on the detection signal of the time window in the sync process.

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Keywords Quantum key distribution system; single-photon avalanche photodiode; the synchronization algorithm; time synchronization; the probability of detection of the signal time window.
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