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On the Change in the Duration of a Narrow-Band Signal in a Dispersive Medium with Increasing Path Length (Within the Framework of the Method of Moments)
IF 0.8 4区 地球科学
Radiophysics and Quantum Electronics Pub Date : 2025-02-06 DOI: 10.1007/s11141-025-10363-w
N. S. Bukhman
{"title":"On the Change in the Duration of a Narrow-Band Signal in a Dispersive Medium with Increasing Path Length (Within the Framework of the Method of Moments)","authors":"N. S. Bukhman","doi":"10.1007/s11141-025-10363-w","DOIUrl":"10.1007/s11141-025-10363-w","url":null,"abstract":"<p>We consider the one-dimensional problem of propagation of a narrow-band signal in a homogeneous dispersive medium. Within the framework of the method of moments, simple relations are obtained which permit one to use integration of smooth (non-oscillatory) functions to find the midpoint and r.m. s. duration of an arbitrary signal at an arbitrary point on the path without any additional approximations. It is shown that if the absorption dispersion is negligible, the square of the r.m. s. duration of the signal depends on the path length according to the parabolic law, i.e., it has a single minimum (“focus” of the signal). The possibility of reducing the duration (and the corresponding power increase) of linear frequency-modulated (LFM) signals during propagation in a dispersive medium is considered. For a space-limited dispersive medium, using the example of a weakly colliding plasma, estimates are obtained for the maximum possible (for a given path length) reduction of the signal duration and increase in its power, as well as for the initial signal parameters at which these capabilities are realized.</p>","PeriodicalId":748,"journal":{"name":"Radiophysics and Quantum Electronics","volume":"67 2","pages":"166 - 180"},"PeriodicalIF":0.8,"publicationDate":"2025-02-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143379774","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Quantitative Characteristics of Causality in a Classical Problem of the Theory of Oscillations
IF 0.8 4区 地球科学
Radiophysics and Quantum Electronics Pub Date : 2025-02-06 DOI: 10.1007/s11141-025-10364-9
D. A. Smirnov
{"title":"Quantitative Characteristics of Causality in a Classical Problem of the Theory of Oscillations","authors":"D. A. Smirnov","doi":"10.1007/s11141-025-10364-9","DOIUrl":"10.1007/s11141-025-10364-9","url":null,"abstract":"<p>Within the formalism of dynamic effects of directional coupling, or dynamic causal effects (DCEs), the relations between modern quantifiers of coupling between oscillatory systems (transfer entropy, Granger–Geweke causality spectrum, spectral DCEs, etc.) and the classical notions of the oscillation theory—namely, the concepts of “coupling” and “coupledness” by Mandelstam—are studied for an exemplary system of two linear dissipative stochastic oscillators. It is shown that the “coupledness” has two different meanings, which are expressed via different DCEs. A whole set of DCEs appears to be a detailed expression of the coupledness concept and provides a more accurate description of the different dynamic aspects of coupling.</p>","PeriodicalId":748,"journal":{"name":"Radiophysics and Quantum Electronics","volume":"67 2","pages":"181 - 197"},"PeriodicalIF":0.8,"publicationDate":"2025-02-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143379773","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Matched Spatiotemporal Filtering of Broadband Signals in the Presence of Active Interference in Systems with Digital Antenna Arrays
IF 0.8 4区 地球科学
Radiophysics and Quantum Electronics Pub Date : 2025-02-04 DOI: 10.1007/s11141-025-10362-x
D. N. Mukhranova, A. A. Murasev, D. O. Sokolova, A. A. Spektor
{"title":"Matched Spatiotemporal Filtering of Broadband Signals in the Presence of Active Interference in Systems with Digital Antenna Arrays","authors":"D. N. Mukhranova,&nbsp;A. A. Murasev,&nbsp;D. O. Sokolova,&nbsp;A. A. Spektor","doi":"10.1007/s11141-025-10362-x","DOIUrl":"10.1007/s11141-025-10362-x","url":null,"abstract":"<p>We consider a mathematical description of signals and interference in broadband radio systems with digital linear and planar antenna arrays. The use of the models of spatiotemporal signals is discussed. The similarity of mathematical models of signals and external active noise interference, which have been filtered in the input amplifiers of receiving devices, is studied. Multidimensional Fourier transforms leading to multidimensional spatiotemporal spectra are considered. Their localization at certain frequencies, depending on the angular direction to the radiation source is shown. With allowance for the above said, to suppress active interference, it is proposed to use multidimensional spatiotemporal matched filtering. An example of the matched filtering of an impulse signal with linear frequency modulation at a plane antenna array is proposed.</p>","PeriodicalId":748,"journal":{"name":"Radiophysics and Quantum Electronics","volume":"67 2","pages":"157 - 165"},"PeriodicalIF":0.8,"publicationDate":"2025-02-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143379760","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Using A Posteriori Moments for Estimating Orientations of Antennas of Radio Engineering Systems
IF 0.8 4区 地球科学
Radiophysics and Quantum Electronics Pub Date : 2025-02-04 DOI: 10.1007/s11141-025-10361-y
E. G. Chub, V. A. Pogorelov
{"title":"Using A Posteriori Moments for Estimating Orientations of Antennas of Radio Engineering Systems","authors":"E. G. Chub,&nbsp;V. A. Pogorelov","doi":"10.1007/s11141-025-10361-y","DOIUrl":"10.1007/s11141-025-10361-y","url":null,"abstract":"<p>Based on the approximation of the <i>a posteriori</i> probability density of a multidimensional Markov process by a system of <i>a posteriori</i> moments, an algorithm for nonlinear stochastic filtering of the antenna state vector of a radio-engineering system has been developed. The proposed suboptimal filter makes it possible to estimate the angles of head, roll, and pitch according to the indications of a global satellite navigation system using three spaced antennas. The advantage of using the proposed method compared with the widely used Kalman filter is shown in the case of non-Gaussian presentation of the state vector.</p>","PeriodicalId":748,"journal":{"name":"Radiophysics and Quantum Electronics","volume":"67 2","pages":"139 - 156"},"PeriodicalIF":0.8,"publicationDate":"2025-02-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143379759","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Analysis of the Center-End-Fed Dipole Antenna Excited by a Rectangular Waveguide
IF 0.8 4区 地球科学
Radiophysics and Quantum Electronics Pub Date : 2025-02-04 DOI: 10.1007/s11141-025-10360-z
A. P. Gorbachev, A. A. Kolesnikov
{"title":"Analysis of the Center-End-Fed Dipole Antenna Excited by a Rectangular Waveguide","authors":"A. P. Gorbachev,&nbsp;A. A. Kolesnikov","doi":"10.1007/s11141-025-10360-z","DOIUrl":"10.1007/s11141-025-10360-z","url":null,"abstract":"<p>We present an analysis of a dipole antenna fed by a rectangular waveguide. The antenna is based on a recently proposed center-end-fed dipole radiator protected by the corresponding patent of the Russian Federation. The radiation resistance and the complex input impedance of such an antenna are determined by using the mirror image theory and the induced electromotive force method. The principles of choosing the optimal antenna-wire radii and the size of the waveguide wide wall are discussed. The experimental results confirm that the proposed approach is correct.</p>","PeriodicalId":748,"journal":{"name":"Radiophysics and Quantum Electronics","volume":"67 2","pages":"126 - 138"},"PeriodicalIF":0.8,"publicationDate":"2025-02-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143379758","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Influence of the Method of Preparation of the Atomic Frequency Comb on the Quantum Memory Efficiency
IF 0.8 4区 地球科学
Radiophysics and Quantum Electronics Pub Date : 2025-02-03 DOI: 10.1007/s11141-025-10359-6
R. A. Akhmedzhanov, L. A. Gushchin, I. V. Zelensky, V. A. Nizov, N. A. Nizov, D. A. Sobgaida
{"title":"Influence of the Method of Preparation of the Atomic Frequency Comb on the Quantum Memory Efficiency","authors":"R. A. Akhmedzhanov,&nbsp;L. A. Gushchin,&nbsp;I. V. Zelensky,&nbsp;V. A. Nizov,&nbsp;N. A. Nizov,&nbsp;D. A. Sobgaida","doi":"10.1007/s11141-025-10359-6","DOIUrl":"10.1007/s11141-025-10359-6","url":null,"abstract":"<p>We demonstrate an implementation of the quantum memory based on the atomic frequency comb protocol in a YLiF<sub>4</sub> crystal doped with Nd ions. Two methods are used for creating the comb: one employs long pulses at different frequencies and the other involves a train of short monochromatic pulses. These methods are compared for two different samples and different numbers of radiation passes through the samples.</p>","PeriodicalId":748,"journal":{"name":"Radiophysics and Quantum Electronics","volume":"67 2","pages":"121 - 125"},"PeriodicalIF":0.8,"publicationDate":"2025-02-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143379757","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Quantum Key Distribution Protocol Using Axially Symmetric Polarization Beams in an Atmospheric Channel 大气信道中轴对称偏振光束的量子密钥分配协议
IF 0.8 4区 地球科学
Radiophysics and Quantum Electronics Pub Date : 2025-01-07 DOI: 10.1007/s11141-025-10352-z
D. D. Reshetnikov, A. L. Sokolov, E. A. Vashukevich, V. M. Petrov, T. Yu. Golubeva
{"title":"Quantum Key Distribution Protocol Using Axially Symmetric Polarization Beams in an Atmospheric Channel","authors":"D. D. Reshetnikov,&nbsp;A. L. Sokolov,&nbsp;E. A. Vashukevich,&nbsp;V. M. Petrov,&nbsp;T. Yu. Golubeva","doi":"10.1007/s11141-025-10352-z","DOIUrl":"10.1007/s11141-025-10352-z","url":null,"abstract":"<p>We propose a quantum key distribution protocol using axially symmetric polarization beams invariant to rotation of the radial coordinate in a plane that is normal to the beam propagation axis. A description and a method for generating vector beams with an axially symmetric polarization structure, which are formed by a vector superposition of the Hermite–Gaussian modes with indices 10 and 01 are given. It is shown that axial polarization symmetry renders such beams insensitive to rotations relative to the optical axis, which makes it possible to use them for transmitting information in cryptographic protocols in space communication systems. The mechanism of mode formation using radial polarizers and cube corner reflectors is shown in detail. Although a classical communication channel can be organized using radial polarizers, the inclusion of non-unitary elements in a quantum communication channel destroys its cryptographic strength. Therefore, we consider the procedure for detecting phase shifts in the configuration of the Mach–Zehnder interferometer whose elements are cube corner reflectors.</p>","PeriodicalId":748,"journal":{"name":"Radiophysics and Quantum Electronics","volume":"67 1","pages":"51 - 63"},"PeriodicalIF":0.8,"publicationDate":"2025-01-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142976551","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Multiresonator Quantum Memory with Multicycle Information Storage 具有多周期信息存储的多谐振腔量子存储器
IF 0.8 4区 地球科学
Radiophysics and Quantum Electronics Pub Date : 2025-01-06 DOI: 10.1007/s11141-025-10358-7
N. S. Perminov, S. A. Moiseev
{"title":"Multiresonator Quantum Memory with Multicycle Information Storage","authors":"N. S. Perminov,&nbsp;S. A. Moiseev","doi":"10.1007/s11141-025-10358-7","DOIUrl":"10.1007/s11141-025-10358-7","url":null,"abstract":"<p>We propose a multiresonator quantum memory consisting of four mini-resonators coupled with a common resonator, which is connected with an external waveguide via a switch. Using the optimization methods, it is possible to effectively transmit a signal from the waveguide to the memory and its long-term multi-cycle storage when the switch is turned off. The advantages of the proposed memory and its potential and implementation range are discussed.</p>","PeriodicalId":748,"journal":{"name":"Radiophysics and Quantum Electronics","volume":"67 1","pages":"113 - 119"},"PeriodicalIF":0.8,"publicationDate":"2025-01-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142976487","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Injection Locking for Spectral Filtering of the Addressing Laser for Optical Qubits in 171Yb+ Ions 171Yb+离子中光学量子比特寻址激光器光谱滤波的注入锁定
IF 0.8 4区 地球科学
Radiophysics and Quantum Electronics Pub Date : 2025-01-06 DOI: 10.1007/s11141-025-10349-8
K. P. Galstyan, I. V. Zalivako, D. S. Kryuchkov, N. N. Kolachevsky
{"title":"Injection Locking for Spectral Filtering of the Addressing Laser for Optical Qubits in 171Yb+ Ions","authors":"K. P. Galstyan,&nbsp;I. V. Zalivako,&nbsp;D. S. Kryuchkov,&nbsp;N. N. Kolachevsky","doi":"10.1007/s11141-025-10349-8","DOIUrl":"10.1007/s11141-025-10349-8","url":null,"abstract":"<p>We demonstrate the implementation of a diode laser with high frequency stability at averaging times of 0.1 s to 100 s and low high-frequency phase noise (up to 5 MHz) to control the quantum state of optical qubits based on <sup>171</sup>Yb<sup>+</sup> ions. A high-finesse ULE glass optical cavity is used as an external reference to stabilize the laser frequency and as a spectral filter for high-frequency noise. The calculated suppression of laser phase noise by the cavity at a frequency of 1.2 MHz (where the laser noise density before the filtering reaches its maximum) is 49 dB. Injection locking makes it possible to amplify spectrally pure laser light and use it to control the quantum state of qubits. The spectral purity of the slave laser diode emission is studied by measuring the beat signal of the amplified emission relative to the light transmitted through the cavity. It is shown that the phase noise introduced by injection locking does not exceed -70 dBc in a bandwidth of up to 5 MHz, while an output power of up to 30 mW was achieved.</p>","PeriodicalId":748,"journal":{"name":"Radiophysics and Quantum Electronics","volume":"67 1","pages":"13 - 22"},"PeriodicalIF":0.8,"publicationDate":"2025-01-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142976488","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Single-Photon Source for the Red Spectral Range Based on a Nanoantenna with InAs/AlGaAs Quantum Dots 基于InAs/AlGaAs量子点纳米天线的红光谱单光子源
IF 0.8 4区 地球科学
Radiophysics and Quantum Electronics Pub Date : 2025-01-06 DOI: 10.1007/s11141-025-10354-x
A. I. Veretennikov, M. V. Rakhlin, A. I. Galimov, D. R. Kazanov, G. V. Klimko, I. V. Sedova, M. M. Kulagina, Yu. M. Zadiranov, Yu. A. Guseva, A. A. Toropov
{"title":"Single-Photon Source for the Red Spectral Range Based on a Nanoantenna with InAs/AlGaAs Quantum Dots","authors":"A. I. Veretennikov,&nbsp;M. V. Rakhlin,&nbsp;A. I. Galimov,&nbsp;D. R. Kazanov,&nbsp;G. V. Klimko,&nbsp;I. V. Sedova,&nbsp;M. M. Kulagina,&nbsp;Yu. M. Zadiranov,&nbsp;Yu. A. Guseva,&nbsp;A. A. Toropov","doi":"10.1007/s11141-025-10354-x","DOIUrl":"10.1007/s11141-025-10354-x","url":null,"abstract":"<p>We optimize the geometric parameters of the single-photon source operated in the red spectral range, which is based on a photonic nanoantenna with InAs/AlGaAs quantum dots. This made it possible to determine the range of the transverse dimensions of the cylindrical nanoantenna, within which the maximum efficiency of radiation extraction into the numerical aperture NA = 0.42 is achieved. An increase in the extraction efficiency as compared to a planar structure was demonstrated for the optimized nanostructure. The statistics of single photon correlations under optical pumping with participation of acoustic phonons is studied. The value of the zero-delay second-order correlation function <i>g</i><sup>(2)</sup>(0) was 0.065.</p>","PeriodicalId":748,"journal":{"name":"Radiophysics and Quantum Electronics","volume":"67 1","pages":"72 - 79"},"PeriodicalIF":0.8,"publicationDate":"2025-01-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142976492","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
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