In the description of quantum key distribution systems, much attention is paid to operation cryptography protocols. The main problem insufficient study synchronization process systems. This paper contains a general principles. A two-line fiber-optic system with phase coding photon states in transceiver and station mode was examined. built on basis scheme automatic compensation polarization distortions. Single-photon avalanche diodes were used as optical radiation detecting devices. It...

The synchronization a two pass self-compensation quantum key distribution system (QKDS) with phase-encoded photon states are reviewed. A modified algorithm for synchronizing QKDS was proposed. first is the emphasis on implementation in single-photon mode which improves security. second peculiarity that case number of accumulated impulses adjacent time windows equal, it decided to receive impulse by any these windows, if exceeds measured dark current pulses (DCP) rest windows. In known such...

A two-pass auto-compensation fiber-optic quantum key distribution system (QKDS) with phase-encoded photon states in synchronization mode has been investigated. Preliminary stage sync initialization algorithm of QKDS that requires impulse-repetition period division into time windows as well signal window detection proposed. The peculiarity the being investigated is it implemented single-photon which improves security. second case number accumulated impulses two adjacent equal, decided to...

The two pass auto compensation quantum key distribution system (QKDS) with phase-encoded states of photons in synchronization mode are studied. algorithm QKDS, presupposing the division repetition period optical pulses on time windows and detection signal window offered. peculiarity is that it implemented single-photon mode, increasing security mode. second feature when equal numbers accumulated adjacent windows, a decision for admission photon pulse any if number exceeds detected other...

In this paper, offered a new method of synchronization the transmitting/receiving and coding stations autocompensation two-pass quantum key distribution system with phase states photons. This is based on use photonic pulses, which can improve security level process systems. sync does not include division time frames at windows has high operating speed. paper were synthesized formulas for calculating probability characteristics parameters process.

This paper describes trends in the field of encryption, based on principles quantum cryptography. Here is a description commercial self-compensation key distribution system (QKDS). A quantum-cryptographic network stand, integrated QKDS Clavis2 from idQuantique (Switzerland), also proposed. Research integration into telecommunication data transmission encryption protocol offered. Capabilities stand are formulated.

In this article, authors proposed feature detection algorithm, which stable to the change in conditions of observation. Upon signal element with unknown intensity level, another set background elements used as additional samples information on noise (background) process. Equations for calculation false alarm rate, correct probability and threshold constants were developed. Simulation proved stability decision rule detect a point discrete space varying mean standard deviation radiation...

Continuous-variable quantum key distribution (CV-QKD) with a real local oscillator (LO) experiences phase attack security challenge due to the reference pulses transmitted along signals over an unsecure channel. In this paper, on of CV-QKD LO is investigated. The performance discrete-modulated (DM) under analyzed analytically and by simulation, compared Gaussian-modulated (GM) CV-QKD. It found that such eavesdropper's, significantly reduce transmission distance for GM based CV-QKD, whereas,...

The time and probability parameters of the two-stage synchronization algorithm for autocompensation quantum key distribution (QKD) systems analogous algorithm, implying division frame into windows, are investigated. A comparative analysis algorithms is carried out recommendations their application short long fiber-optic communication lines presented. work also shows methods calculating mean QKD stations according to above algorithms.

The parameters of the two-stage synchronization algorithm for auto-compensation quantum key distribution (QKD) systems are investigated. does not provide splitting a frame equal to period optical clock time windows. equipment operates in search mode receiving photon. goes into test when reception photon is possible only during action strobe pulse. rest channel react photons and dark current impulses (DCI). provides sequential testing frames with stop at registration first makes decision...

The paper discusses design and investigation of a new approach to chirp generation for the aim frequency deviation increasing. structure device that implements based on self-phase modulation in optical fibers is given. Self-phase an effect nonlinear optics causes spectrum broadening high-power light impulse during its propagation over fiber. In some cases, pulse transforms into what can be used radio signal processing. Analytical expressions assess main parameters result signals are verified...

The paper presents a robust algorithm for detecting of features, the effectiveness detector bright and dark features analyzed in processing natural scene images. Images computer vision systems are often exposed to noise, such action causes performance degradation increases rate false alarms. Research shows that detection weakly dependent on mathematical moments image determined alarm. level alarm test does not depend priori unknown mean standard deviation background process.

The object of this study is a two-pass fiber-optic quantum key distribution system (QKDS) with phase coding states photons in synchronisation mode. QKDS based on scheme automatic compensation polarisation distortions. We use single-photon avalanche photodiodes (SPAD) as optical radiation detection devices. also evaluate the impact parameters used detectors probabilistic and time characteristics detected interval weak pulse sync. In paper, we describe methodology design process to detect an...

A comparative analysis of 3×3 pixel robust detector and Harris in terms stability performance detection case viewing conditions change caused by the collection conversion image cameras presented. The efficiency detectors was evaluated repeatability feature on a different pair images when observation, camera parameters (focal length, aperture size lens), position relative to observed scene, scene illumination changes. Simulation results show that used under these provides greater number...

Authors proved existence of uniformly most powerful invariant algorithm based on the t-test. Conducted study allowed to synthesize decision rule for detection image features 3×3 pixel patch was found. Simulation stability proposed feature point change mean value and standard deviation background pixels' intensity. Versatility determined only by set pixels in signal sample. Uniqueness detected formation support analyzed samples. obtained equations that allow assess effectiveness robust detector.

Effective detection of the feature points in images requires usage detectors that produces similar results variable observation conditions. Authors present a detector which is based on uniformly most powerful invariant algorithm uses t-test. The authors obtained equations allow evaluating effectiveness robust detector. Simulation proved robustness (constant rate false alarms) proposed point to changes mean value and standard deviation background pixels' intensity. study invariance...

The method of adaptive control the parameters onboard vision system an autonomous mobile robot operating on unknown stage is considered. camera orientation and focal length lens are subject to control. carried out in normal mode operation by comparing test fragment image with reference one. fragments contain constructive elements platform robot. obtained calibration procedure stored memory system. If there discrepancies between image, type mismatch determined, their magnitude measured,...

The efficiency of the detector point features to a stationary uncorrelated noise digital television image analysis is produced. Two methods improve reliability isolation characteristics scene on images in are presented. requirements ensure necessary level signal/noise ratio for effective computer spot given. research results will effectiveness TV picture autonomous local navigation and positioning complexes based vision systems noise.

Handling vast amounts of data is crucial in today's world. The growth high-performance computing has created a need for parallelization, particularly the area machine learning algorithms such as ANN (Approximate Nearest Neighbors). To improve speed these algorithms, it important to optimize them specific processor architectures. RISC-V (Reduced Instruction Set Computer Five) one modern architectures, which features vector instruction set called RVV (RISC-V Vector Extension). In extensions...