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Three-Mode Entangled States of the Field in the Process of Nondegenerate Parametric Decay in an Optical Resonator
IF 0.5 4区 物理与天体物理
Journal of Contemporary Physics (Armenian Academy of Sciences) Pub Date : 2025-03-16 DOI: 10.1134/S1068337225700112
S. T. Gevorgyan, M. S. Gevorgyan
{"title":"Three-Mode Entangled States of the Field in the Process of Nondegenerate Parametric Decay in an Optical Resonator","authors":"S. T. Gevorgyan,&nbsp;M. S. Gevorgyan","doi":"10.1134/S1068337225700112","DOIUrl":"10.1134/S1068337225700112","url":null,"abstract":"<p>For the process of non-degenerate parametric decay in an optical resonator, in which a quantum with energy <span>(hbar {{{{omega }}}_{3}})</span> decays into two quanta with energies <span>(hbar {{{{omega }}}_{2}})</span> and <span>(hbar {{{{omega }}}_{1}})</span>, where <span>(hbar {{{{omega }}}_{3}} = hbar {{{{omega }}}_{2}} + hbar {{{{omega }}}_{1}})</span> is the possibility of forming entangled states of the field by variables of the number of photons between interacting modes of the optical system is investigated. For this purpose, we investigated the dynamics of normalized correlation functions of fluctuations of the number of photons of interacting modes using a Monte–Carlo method. It is shown that in the stationary interaction limit, the value of these correlation functions strongly depends on the value of the coupling coefficient between the modes. It is shown that strong entanglement of the state of three interacting field modes is obtained in the case of weak coupling between the modes. In the case of extreme coupling between them, the value of the correlation function of fluctuations of the number of photons of the field modes tends to unity, because of which entanglement between the states of the modes disappears.</p>","PeriodicalId":623,"journal":{"name":"Journal of Contemporary Physics (Armenian Academy of Sciences)","volume":"59 4","pages":"391 - 395"},"PeriodicalIF":0.5,"publicationDate":"2025-03-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143632585","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Bremsstrahlung of Electrons in Water in Contact with Materials Containing Radioactive Impurities
IF 0.5 4区 物理与天体物理
Journal of Contemporary Physics (Armenian Academy of Sciences) Pub Date : 2025-03-16 DOI: 10.1134/S1068337225700100
R. N. Balasanyan, I. G. Grigoryan, P. H. Muzhikyan, R. B. Kostanyan
{"title":"Bremsstrahlung of Electrons in Water in Contact with Materials Containing Radioactive Impurities","authors":"R. N. Balasanyan,&nbsp;I. G. Grigoryan,&nbsp;P. H. Muzhikyan,&nbsp;R. B. Kostanyan","doi":"10.1134/S1068337225700100","DOIUrl":"10.1134/S1068337225700100","url":null,"abstract":"<p>Changes in the intensity of electron bremsstrahlung radiation when samples of metallic tungsten and optical glass containing radioactive impurities are immersed in water were experimentally studied. The bremsstrahlung intensity measurements were performed on a gamma-ray spectrometer. The results of experimental measurements performed on a pure tungsten sample are also presented for comparison. It has been shown that when materials with a radioactive impurity subject to β<sup>−</sup>-decay come into contact with water, X-ray radiation with an energy of 5.67 keV is generated. However, similar interactions involving materials with radioactive impurities undergoing α-decay do not generate bremsstrahlung radiation.</p>","PeriodicalId":623,"journal":{"name":"Journal of Contemporary Physics (Armenian Academy of Sciences)","volume":"59 4","pages":"366 - 370"},"PeriodicalIF":0.5,"publicationDate":"2025-03-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143632587","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Sectorial Ground-State Nondegeneracy in Majorana Chains with Interaction and Orthogonal Symmetry
IF 0.5 4区 物理与天体物理
Journal of Contemporary Physics (Armenian Academy of Sciences) Pub Date : 2025-03-16 DOI: 10.1134/S1068337225700136
T. S. Hakobyan
{"title":"Sectorial Ground-State Nondegeneracy in Majorana Chains with Interaction and Orthogonal Symmetry","authors":"T. S. Hakobyan","doi":"10.1134/S1068337225700136","DOIUrl":"10.1134/S1068337225700136","url":null,"abstract":"<p>Various quantum chains consisting of interacting Majorana fermions with flavors are constructed. These systems are invariant with respect to the rotations and reflections in the flavor space. The entire space of states splits into sectors characterized by a specific set of fermionic parities related to different flavors. All systems under consideration satisfy the Lieb-Mattis condition. As a result, the lowest-energy states within individual sectors are nondegenerate. The sectorial ground states are combined into antisymmetric (in flavor numbers) multiplets.</p>","PeriodicalId":623,"journal":{"name":"Journal of Contemporary Physics (Armenian Academy of Sciences)","volume":"59 4","pages":"437 - 444"},"PeriodicalIF":0.5,"publicationDate":"2025-03-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143632547","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
The Reconstruction of Long-Lived Particles in the CMS (LHC) Experiment
IF 0.5 4区 物理与天体物理
Journal of Contemporary Physics (Armenian Academy of Sciences) Pub Date : 2025-03-16 DOI: 10.1134/S1068337225700148
A. A. Hayrapetyan
{"title":"The Reconstruction of Long-Lived Particles in the CMS (LHC) Experiment","authors":"A. A. Hayrapetyan","doi":"10.1134/S1068337225700148","DOIUrl":"10.1134/S1068337225700148","url":null,"abstract":"<p>An algorithm has been developed for reconstructing long-lived particles (LLP) decaying in the barrel and endcap regions of the muon system of the CMS detector at the Large Hadron Collider. Calculations were done on the basis of Monte Carlo simulated data using CMSSW package, adapted to the conditions of CMS detector experimental setup of 2018. In considered process the hypothetical LLP particles are produced from decays of B mesons in proton–proton (p–p) collisions at a center-of-mass energy of 13 TeV. Decays of LLP particles in the muon system of the CMS detector are characterized by the presence of wide showers with a large multiplicity of hits from the muon chamber channels, which differs significantly from the hits of known particles, and is a good criterion for identifying LLP particles.</p>","PeriodicalId":623,"journal":{"name":"Journal of Contemporary Physics (Armenian Academy of Sciences)","volume":"59 4","pages":"353 - 358"},"PeriodicalIF":0.5,"publicationDate":"2025-03-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143632583","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Impurity States in a Quasi-Conical Quantum Dot
IF 0.5 4区 物理与天体物理
Journal of Contemporary Physics (Armenian Academy of Sciences) Pub Date : 2025-03-16 DOI: 10.1134/S1068337225700161
Kh. S. Khachatryan, M. A. Mkrtchyan
{"title":"Impurity States in a Quasi-Conical Quantum Dot","authors":"Kh. S. Khachatryan,&nbsp;M. A. Mkrtchyan","doi":"10.1134/S1068337225700161","DOIUrl":"10.1134/S1068337225700161","url":null,"abstract":"<p>Donor impurity states in a quasi-conical quantum dot are theoretically investigated. The confinement potential is considered within the framework of the model with infinite walls. The problem is considered because the impurity is located at the vertex of a quasi-conical quantum dot. Based on the hydrogen atom model, the impurity and the electron’s interaction potential is Coulomb potential. Because of the complexity, the problem is solved using the approximate finite element method (FEM). The FEM method is used to compute the energy states and wave functions of the system both in the presence and absence of the donor impurity. Based on the obtained results, the dependences of the impurity binding energy on the geometric parameters of the quasi-conical quantum dot and the probability density of the electron cloud distribution in the quantum dot are studied.</p>","PeriodicalId":623,"journal":{"name":"Journal of Contemporary Physics (Armenian Academy of Sciences)","volume":"59 4","pages":"396 - 400"},"PeriodicalIF":0.5,"publicationDate":"2025-03-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143632334","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
On the Output Vacuum Windows of Accelerator Facilities Used in the AANL (YerPhI) Experiments
IF 0.5 4区 物理与天体物理
Journal of Contemporary Physics (Armenian Academy of Sciences) Pub Date : 2025-03-16 DOI: 10.1134/S1068337225700239
L. R. Vahradyan, A. S. Hakobyan, L. A. Poghosyan, G. D. Movsesyan, H. H. Marukyan
{"title":"On the Output Vacuum Windows of Accelerator Facilities Used in the AANL (YerPhI) Experiments","authors":"L. R. Vahradyan,&nbsp;A. S. Hakobyan,&nbsp;L. A. Poghosyan,&nbsp;G. D. Movsesyan,&nbsp;H. H. Marukyan","doi":"10.1134/S1068337225700239","DOIUrl":"10.1134/S1068337225700239","url":null,"abstract":"<p>The energy losses of charged particles passing through the vacuum-tight exit windows of the operating accelerator facilities where experiments are carried out at the AANL (YerPhI), have been determined. Computation tables and graphs of the dependencies of the energy loss of the accelerated beam on its kinetic energy, the thickness of foils made of materials used in the separation windows, and the distances from the windows to the targets in the air are given.</p>","PeriodicalId":623,"journal":{"name":"Journal of Contemporary Physics (Armenian Academy of Sciences)","volume":"59 4","pages":"450 - 457"},"PeriodicalIF":0.5,"publicationDate":"2025-03-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143632544","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
On the Threshold of Mechanical Freedericksz Transition in the Liquid Crystalline Elastomer
IF 0.5 4区 物理与天体物理
Journal of Contemporary Physics (Armenian Academy of Sciences) Pub Date : 2025-03-16 DOI: 10.1134/S1068337225700240
M. R. Hakobyan, R. S. Hakobyan
{"title":"On the Threshold of Mechanical Freedericksz Transition in the Liquid Crystalline Elastomer","authors":"M. R. Hakobyan,&nbsp;R. S. Hakobyan","doi":"10.1134/S1068337225700240","DOIUrl":"10.1134/S1068337225700240","url":null,"abstract":"<p>The study of the threshold mechanical transition of Freedericksz is presented for the first time, taking into account the nonlinearity of the interaction of orientational and mechanical anisotropy, using weakly crosslinked nematic elastomers with side chains as an example. The reorientation of the director of the liquid crystal elastomer has a threshold character in cases where the mechanical stress is applied perpendicular to the initial orientation of the liquid crystal director. The threshold of reorientation of the liquid crystal molecules is analytically calculated. The experimental implementation of the proposed approach will allow us to determine one of the coefficients of nonlinear interaction.</p>","PeriodicalId":623,"journal":{"name":"Journal of Contemporary Physics (Armenian Academy of Sciences)","volume":"59 4","pages":"445 - 449"},"PeriodicalIF":0.5,"publicationDate":"2025-03-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143632545","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Features of Selective Reflection of High-Intensity Laser Radiation Using Rubidium Nanocell 利用铷纳米电池选择性反射高强度激光辐射的特性
IF 0.5 4区 物理与天体物理
Journal of Contemporary Physics (Armenian Academy of Sciences) Pub Date : 2025-01-15 DOI: 10.1134/S1068337224700464
A. D. Sargsyan, D. H. Sarkisyan
{"title":"Features of Selective Reflection of High-Intensity Laser Radiation Using Rubidium Nanocell","authors":"A. D. Sargsyan,&nbsp;D. H. Sarkisyan","doi":"10.1134/S1068337224700464","DOIUrl":"10.1134/S1068337224700464","url":null,"abstract":"<p>The effect of selective reflection (SR) of laser radiation from the boundary of <sup>87</sup>Rb D<sub>2</sub>-line atomic vapors and a dielectric window was studied using a nanocell (NC) with a vapor column thickness of ~300 nm. The formation of an SR with a spectral width of 25 MHz, located on atomic transitions, is demonstrated. This is a record narrowing of the 670 MHz Doppler width by a factor of 27 using single-pass geometry. The SR signal reaches several percent of the intensity of its forming radiation, and the SR amplitude’s linear dependence is maintained up to 100 mW/cm<sup>2</sup>, which is almost two orders of magnitude greater than the saturation intensity of optical processes when using centimeter-long cells with atomic vapors. Such a high saturation intensity value is achieved by using the nanocell.</p>","PeriodicalId":623,"journal":{"name":"Journal of Contemporary Physics (Armenian Academy of Sciences)","volume":"59 3","pages":"233 - 237"},"PeriodicalIF":0.5,"publicationDate":"2025-01-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1134/S1068337224700464.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142994664","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Second Harmonic Generation of High Power Cosh-Gaussian Beam in Thermal Quantum Plasma: Effect of Relativistic and Ponderomotive Nonlinearity 高功率cosh -高斯光束在热量子等离子体中的二次谐波产生：相对论和质心非线性的影响
IF 0.5 4区 物理与天体物理
Journal of Contemporary Physics (Armenian Academy of Sciences) Pub Date : 2025-01-15 DOI: 10.1134/S1068337224700488
K. Singh, K. Walia
{"title":"Second Harmonic Generation of High Power Cosh-Gaussian Beam in Thermal Quantum Plasma: Effect of Relativistic and Ponderomotive Nonlinearity","authors":"K. Singh,&nbsp;K. Walia","doi":"10.1134/S1068337224700488","DOIUrl":"10.1134/S1068337224700488","url":null,"abstract":"<p>Second harmonic generation (SHG) of high power Cosh-Gaussian (ChG) beam in thermal quantum plasma (TQP) is explored in current investigation. Relativistic and ponderomotive nonlinearities are taken together in present investigation. Combination of relativistic-ponderomotive nonlinearities causes modification in electron mass, thereby producing density gradients inside plasma. This further produces self-focusing of main beam. The well-known WKB and paraxial approaches are used for solving main beam’s wave equation and to obtain 2nd order ordinary differential equation (ODE). There is generation of electron plasma wave (EPW) due to these density gradients. Excited EPW interacts with main beam to generate 2nd harmonics in plasma. Effects of combined relativistic-ponderomotive nonlinearities and established laser–plasma parameters on beam’s waist and SHG yield are studied in present study.</p>","PeriodicalId":623,"journal":{"name":"Journal of Contemporary Physics (Armenian Academy of Sciences)","volume":"59 3","pages":"244 - 253"},"PeriodicalIF":0.5,"publicationDate":"2025-01-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142994663","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Impact of High-Power Cosh-Gaussian Beam on Second Harmonic Generation in Collisionless Magnetoplasma 高功率cosh -高斯光束对无碰撞磁等离子体二次谐波产生的影响
IF 0.5 4区 物理与天体物理
Journal of Contemporary Physics (Armenian Academy of Sciences) Pub Date : 2025-01-15 DOI: 10.1134/S106833722470049X
T. Singh, K. Walia
{"title":"Impact of High-Power Cosh-Gaussian Beam on Second Harmonic Generation in Collisionless Magnetoplasma","authors":"T. Singh,&nbsp;K. Walia","doi":"10.1134/S106833722470049X","DOIUrl":"10.1134/S106833722470049X","url":null,"abstract":"<p>The impact of high power Cosh-Gaussian (ChG) beam on Second harmonic generation (SHG) in Collisionless magnetoplasma is explored in present work. Whenever the input beam propagates along external magnetic magnetic field direction, then there are two propagation modes viz. extraordinary mode and ordinary mode. The modification in magnetic field strength causes redistribution of carriers. The density gradients get established in plasma in a normal direction to input wave due to ponderomotive force. Further, there is production of electron plasma wave (EPW) at input wave frequency due to density gradients. EPW nonlinearly interacts with pump wave causing generation of 2nd harmonics. The 2nd order differential equation (ODE) for beam width of and efficiency of 2nd harmonics are derived through well-known paraxial theory approach. RK4 method is employed for carrying out numerical calculation of nonlinear ODE along with efficiency of 2nd harmonics. Impact of change in selective laser-plasma parameters and externally applied magnetic field on beam waist of input wave and efficiency of SHG are also explored.</p>","PeriodicalId":623,"journal":{"name":"Journal of Contemporary Physics (Armenian Academy of Sciences)","volume":"59 3","pages":"254 - 264"},"PeriodicalIF":0.5,"publicationDate":"2025-01-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142994716","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","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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