The European Physical Journal Plus最新文献_第5页

Dynamics in the Yang–Baxter systems: Thermal quantum coherence and quantum correlations Yang-Baxter系统动力学：热量子相干性和量子相关性

IF 2.9 3区物理与天体物理

The European Physical Journal Plus Pub Date : 2025-09-27 DOI: 10.1140/epjp/s13360-025-06877-x

Durgun Duran, Adem Türkmen, Gökhan Çelebi, Beyza Dernek

引用次数: 0

Trapped ion quantum hardware demonstration of energy calculations using a multireference unitary coupled cluster ansatz: application to the BeH(_2) insertion problem 使用多参考单一耦合簇分析的捕获离子量子硬件能量计算演示：应用于BeH (_2)插入问题

IF 2.9 3区物理与天体物理

The European Physical Journal Plus Pub Date : 2025-09-27 DOI: 10.1140/epjp/s13360-025-06876-y

Palak Chawla, Disha Shetty, Peniel Bertrand Tsemo, Kenji Sugisaki, Jordi Riu, Jan Nogué, Debashis Mukherjee, V. S. Prasannaa

{"title":"Trapped ion quantum hardware demonstration of energy calculations using a multireference unitary coupled cluster ansatz: application to the BeH(_2) insertion problem","authors":"Palak Chawla, Disha Shetty, Peniel Bertrand Tsemo, Kenji Sugisaki, Jordi Riu, Jan Nogué, Debashis Mukherjee, V. S. Prasannaa","doi":"10.1140/epjp/s13360-025-06876-y","DOIUrl":"10.1140/epjp/s13360-025-06876-y","url":null,"abstract":"<div><p>In this study, we employ the variational quantum eigensolver algorithm with a multireference unitary coupled cluster ansatz to report the ground state energy of the BeH<span>(_2)</span> molecule in a geometry where strong correlation effects are significant. We consider the two most important determinants in the construction of the reference state for our ansatz. We remove redundancies in order to execute a redundancy-free calculation. In view of the currently available noisy quantum hardware, we carry out parameter optimization on a classical computer and measure the energy with optimized parameters on a quantum computer. Furthermore, in order to carry out our intended 12-qubit computation with error mitigation and post-selection on a noisy intermediate scale quantum era trapped ion hardware (the commercially available IonQ Forte-I), we perform a series of resource reduction techniques to a. decrease the number of two-qubit gates by <span>(99.84%)</span> (from 12243 to 20 two-qubit gates) relative to the unoptimized circuit, and b. reduce the number of measurements via the idea of supercliques, while losing <span>(2.69%)</span> in the obtained ground state energy relative to that computed classically for the same resource-optimized problem setting.</p></div>","PeriodicalId":792,"journal":{"name":"The European Physical Journal Plus","volume":"140 9","pages":""},"PeriodicalIF":2.9,"publicationDate":"2025-09-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145169890","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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

Noncommutative Landau problem in graphene: a gauge-invariant analysis with the Seiberg–Witten map 石墨烯中的非交换朗道问题：用Seiberg-Witten映射的量规不变分析

IF 2.9 3区物理与天体物理

The European Physical Journal Plus Pub Date : 2025-09-27 DOI: 10.1140/epjp/s13360-025-06842-8

Aslam Halder

引用次数: 0

Atomic data for six-times ionized krypton (Kr VII): energy levels, allowed and forbidden transitions 六次电离氪（Kr VII）的原子数据：能级，允许和禁止跃迁

IF 2.9 3区物理与天体物理

The European Physical Journal Plus Pub Date : 2025-09-26 DOI: 10.1140/epjp/s13360-025-06831-x

Selda Eser, Hurisel Basmacı

{"title":"Atomic data for six-times ionized krypton (Kr VII): energy levels, allowed and forbidden transitions","authors":"Selda Eser, Hurisel Basmacı","doi":"10.1140/epjp/s13360-025-06831-x","DOIUrl":"10.1140/epjp/s13360-025-06831-x","url":null,"abstract":"<div><p>Accurate atomic data for ionized noble gases are essential in various scientific and industrial fields, including astrophysics, plasma diagnostics, and fusion research. In this study, we investigate the atomic structure and radiative transition parameters of six-times ionized krypton (Kr VII), a Zn-like ion of astrophysical and technological importance. The energy levels of Kr VII were calculated using the fully relativistic multi-configuration Dirac–Fock (MCDF) method implemented in the GRASP code. The effects of quantum electrodynamics (QED) corrections and Breit interactions were also taken into account in the MCDF calculations to improve the accuracy of the computed energy levels. In addition, electric dipole (E1), electric quadrupole (E2), and magnetic dipole (M1) transition parameter including wavelengths (λ), transition probabilities (A<sub>ij</sub>), oscillator strengths (f<sub>ji</sub>), and line strengths (S<sub>ij</sub>) were systematically evaluated. The results were compared with available experimental and theoretical data in the literature. While existing studies provide partial data for some levels and E1 transitions, our work presents new results, especially for E2 and M1 transitions, which have not been previously reported. This study not only enhances the atomic dataset for Kr VII but also contributes original spectroscopic parameters to the current literature, supporting future astrophysical modeling and plasma diagnostics.</p><h3>Graphical abstract</h3>\u0000<div><figure><div><div><picture><source><img></source></picture></div></div></figure></div></div>","PeriodicalId":792,"journal":{"name":"The European Physical Journal Plus","volume":"140 9","pages":""},"PeriodicalIF":2.9,"publicationDate":"2025-09-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145169618","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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

Tunable control of birefringent sub-luminal to super-luminal propagation of structured light in a chiral medium 结构光在手性介质中亚光到超光双折射传播的可调控制

IF 2.9 3区物理与天体物理

The European Physical Journal Plus Pub Date : 2025-09-26 DOI: 10.1140/epjp/s13360-025-06854-4

Jamal Nasar Khan, Tanzeela Ibrahim, Sana Ullah, Kefayat Ullah

{"title":"Tunable control of birefringent sub-luminal to super-luminal propagation of structured light in a chiral medium","authors":"Jamal Nasar Khan, Tanzeela Ibrahim, Sana Ullah, Kefayat Ullah","doi":"10.1140/epjp/s13360-025-06854-4","DOIUrl":"10.1140/epjp/s13360-025-06854-4","url":null,"abstract":"<div><p>This work explores birefringent sub-luminal and super-luminal structured light propagation in a chiral atomic medium. The study investigates how structured light affects left circularly polarized (LCP) and right circularly polarized (RCP) probe beams through azimuthal quantum number-dependent control fields. Control fields carrying topological charges are used to manipulate the absorption, dispersion, and propagation speeds of LCP and RCP beams. The effects of varying topological charges on these optical properties are analyzed. Specifically, positive and negative group indices for RCP and LCP beams are examined within the range of <span>(-4times 10^{5}le n^{(R,L)}_gle 4times 10^{5})</span>. Variations in sub-luminal and super-luminal propagation are studied within the velocity range of <span>(-c/4times 10^{5}le v^{(R,L)}_gle c/4times 10^{5})</span>. For <span>(l=n, n)</span> distinct sub-luminal and super-luminal propagation regions are observed. Increasing the value of <i>l</i> enhances super-luminality, while decreasing <i>l</i> enhances sub-luminality. These variations significantly impact the control of light propagation in the medium. The findings provide insights into structured light control in a chiral atomic medium and have potential applications in information storage devices, imaging, and time-cloaking technology.</p></div>","PeriodicalId":792,"journal":{"name":"The European Physical Journal Plus","volume":"140 9","pages":""},"PeriodicalIF":2.9,"publicationDate":"2025-09-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145169221","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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

Coherent states of finite-level systems 有限级系统的相干态

IF 2.9 3区物理与天体物理

The European Physical Journal Plus Pub Date : 2025-09-25 DOI: 10.1140/epjp/s13360-025-06870-4

Alexander I. Breev, Dmitry M. Gitman

{"title":"Coherent states of finite-level systems","authors":"Alexander I. Breev, Dmitry M. Gitman","doi":"10.1140/epjp/s13360-025-06870-4","DOIUrl":"10.1140/epjp/s13360-025-06870-4","url":null,"abstract":"<div><p>A method for constructing coherent states (CS) of finite-level systems with a given angular momentum is proposed. To this end we generalize the known spin equation (SE) to an infinite-dimensional Fock space. The equation describes a special quadratic system in the latter space. Its projections on <i>d</i>-dimensional subspaces represent analogs of SE for <i>d</i>-dimensional systems in an external electromagnetic field which describe <i>d</i>-dimensional systems with a given angular moment. Using a modification of the Malkin-Manko method developed in our earlier work, we construct the corresponding CS for the total quadratic system. Projections of the later CS on finite-dimensional subspaces we call angular moment CS (AMCS) of finite-level systems. The AMCS have a clear physical meaning; they obey the Schrödinger equation for a <i>d</i>-dimensional system with a given angular moment <span>(j=left( d-1right) /2)</span> in an external electromagnetic field. Their possible exact solutions are constructed via exact solutions of the SE in 2-dimensional space. The latter solutions can be found analytically and are completely described in our earlier works. One subset of AMCS can be related to Perelomov spinning CS (PSCS). This reflects the fact that the set of possible AMCS is wider than the set of PSCS. AMCS states in a constant magnetic field are constructed.</p></div>","PeriodicalId":792,"journal":{"name":"The European Physical Journal Plus","volume":"140 9","pages":""},"PeriodicalIF":2.9,"publicationDate":"2025-09-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145168868","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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

Comparative analysis of radiation interaction properties of commonly used dental bracket alloys 常用牙托合金辐射相互作用性能对比分析

IF 2.9 3区物理与天体物理

The European Physical Journal Plus Pub Date : 2025-09-25 DOI: 10.1140/epjp/s13360-025-06867-z

N. Bayindir Durna, D. Durna, E. Kavaz Perişanoğlu

{"title":"Comparative analysis of radiation interaction properties of commonly used dental bracket alloys","authors":"N. Bayindir Durna, D. Durna, E. Kavaz Perişanoğlu","doi":"10.1140/epjp/s13360-025-06867-z","DOIUrl":"10.1140/epjp/s13360-025-06867-z","url":null,"abstract":"<div><p>In this study, we thoroughly examined the radiation interaction properties of four widely used dental bracket alloys: Unitek, Leone, Omniarch, and Legend. Through the use of Scanning Electron Microscopy (SEM) and Energy Dispersive X-ray (EDX) spectroscopy, we assessed the elemental compositions and surface morphologies of these brackets. Legend has the highest density and Unitek the lowest density. X-ray transmission measurements were conducted with a 10 mCi Am-241 test source to obtain spectra, from which we experimentally determined mass attenuation coefficients (MAC) within the energy range of 13.9–59.54 keV, comparing these values to theoretical predictions from EpiXS program. Additionally, we analyzed various photon interaction parameters, including the half-value layer (HVL) and effective atomic number (Z<sub>eff</sub>), to evaluate the photon attenuation capabilities of the brackets. The study revealed notable differences in build-up factors, specifically in energy absorption (EABF) and exposure build-up factors (EBF) across various penetration depths. These findings offer significant insights into the effectiveness of these materials for radiation attenuating in dental applications, with Legend demonstrating superior attenuation properties and Unitek exhibiting higher build-up factors throughout the studied energy spectrum. This research underscores the critical role of material selection in enhancing dental radiation protection.</p></div>","PeriodicalId":792,"journal":{"name":"The European Physical Journal Plus","volume":"140 9","pages":""},"PeriodicalIF":2.9,"publicationDate":"2025-09-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145168870","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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

Designing a two-stage acceleration lens for a 100 keV single-ion implantation system 用于100 keV单离子注入系统的两级加速透镜设计

IF 2.9 3区物理与天体物理

The European Physical Journal Plus Pub Date : 2025-09-25 DOI: 10.1140/epjp/s13360-025-06750-x

Yasuyuki Ishii, Yosuke Yuri, Nobumasa Miyawaki, Shinobu Onoda, Kazumasa Narumi, Yuichi Saitoh

{"title":"Designing a two-stage acceleration lens for a 100 keV single-ion implantation system","authors":"Yasuyuki Ishii, Yosuke Yuri, Nobumasa Miyawaki, Shinobu Onoda, Kazumasa Narumi, Yuichi Saitoh","doi":"10.1140/epjp/s13360-025-06750-x","DOIUrl":"10.1140/epjp/s13360-025-06750-x","url":null,"abstract":"<div><p>An array of color centers, each known as an NV center formed by a single-nitrogen atom and a vacancy, spaced at intervals of several tens of nanometers in a diamond exhibits quantum entanglement effects and indicates potential for quantum device applications. To fabricate such an array by implanting single-nitrogen ions into a diamond, a 100 keV single-ion implantation system (SIIS) has been developed by combining a linear Paul-trap laser-cooling ion source (LPTLC-IS) with a sympathetically cooled ion technique and a two-stage acceleration lens. So far, the LPTLC-IS and the two-stage acceleration lens have been refined as individual elemental technologies. However, for deterministic single-ion implantation, the SIIS must meet the following ion beam conditions: implantation with nanometer accuracy, a long working distance exceeding 100 mm to accommodate a quantum effect detector, and a penetration depth of approximately 100 nm in a diamond. These requirements necessitate the development of a two-stage acceleration lens capable of focusing the ion beam to a width of < 50 nm without a collimator when using a 100 keV ion beam. In this study, the two-stage acceleration lens, comprising 1st and 2nd acceleration lenses, was redesigned using numerical simulations to optimize lens parameters. Our primary redesign focus was the 2nd acceleration lens, which was redesigned based on the configuration of the previously developed lens. The resulting two-stage acceleration lens successfully met the target beam conditions for the SIIS.</p></div>","PeriodicalId":792,"journal":{"name":"The European Physical Journal Plus","volume":"140 9","pages":""},"PeriodicalIF":2.9,"publicationDate":"2025-09-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1140/epjp/s13360-025-06750-x.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145168882","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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

Synchronization of the memristor-coupled memristive complex-valued FHN neurons 忆阻耦合忆阻复合体值FHN神经元的同步

IF 2.9 3区物理与天体物理

The European Physical Journal Plus Pub Date : 2025-09-25 DOI: 10.1140/epjp/s13360-025-06849-1

Huaqing Nie, Jian Liu, Yanjun Shu, Kai Jiang, Qixu Guo

{"title":"Synchronization of the memristor-coupled memristive complex-valued FHN neurons","authors":"Huaqing Nie, Jian Liu, Yanjun Shu, Kai Jiang, Qixu Guo","doi":"10.1140/epjp/s13360-025-06849-1","DOIUrl":"10.1140/epjp/s13360-025-06849-1","url":null,"abstract":"<div><p>Complex-valued neurons can encode both amplitude and phase simultaneously, providing a biologically plausible way to model rich signal dynamics in real neural systems. Synaptic coupling is central to coordinating neuronal activity and transmitting information, and memristors—serving as synapse-like devices with internal memory—offer an effective mechanism for mediating its energy-based modulation. In this study, a sinusoidal flux-controlled memristor is used as a biological synapse to connect two memristive complex-valued FitzHugh-Nagumo (mCV-FHN) neurons, forming memristor-coupled mCV-FHN neurons (MC-mCV-FHNs), and their synchronization dynamics are investigated. The system has no equilibrium point and exhibits rich hidden dynamics, including hyperchaotic extreme multistability, multi-scroll attractors with scroll-growth, and pattern migration in firing activities. Based on Lyapunov stability theory in complex space, a rigorous and practical synchronization criterion is derived and numerically validated. The results show that complex synchronization transitions depend critically on both the memristor-coupling strength and the initial state of the memristive coupling channel. Additionally, the Hamilton energy of the mCV-FHN neuron is formulated using Helmholtz’s theorem, explaining the synchronization transition mechanism from an energy-balance perspective. This work establishes a foundation for scaling compact memristive neuron models to larger brain-inspired systems and offers a theoretical basis for future developments in neuromorphic computing and energy-efficient neural hardware.</p></div>","PeriodicalId":792,"journal":{"name":"The European Physical Journal Plus","volume":"140 9","pages":""},"PeriodicalIF":2.9,"publicationDate":"2025-09-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145168881","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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

Some interaction solutions on the periodic background in the (3 + 1)-dimensional Boiti–Leon–Manna–Pempinelli equation （3 + 1）维Boiti-Leon-Manna-Pempinelli方程周期背景下的相互作用解

IF 2.9 3区物理与天体物理

The European Physical Journal Plus Pub Date : 2025-09-25 DOI: 10.1140/epjp/s13360-025-06856-2

Qing-Jiang Feng, Guo-Qing Zhang

{"title":"Some interaction solutions on the periodic background in the (3 + 1)-dimensional Boiti–Leon–Manna–Pempinelli equation","authors":"Qing-Jiang Feng, Guo-Qing Zhang","doi":"10.1140/epjp/s13360-025-06856-2","DOIUrl":"10.1140/epjp/s13360-025-06856-2","url":null,"abstract":"<div><p>This study aims to discuss several types of inelastic collision phenomena between lump waves and kink waves on a periodic background. Based on the generalized bilinear method, a series of new interaction solutions for the (3 + 1) dimensional Boiti–Leon–Manna–Pempinelli equation are constructed by introducing several types of test functions. These interaction solutions can describe several novel nonlinear phenomena of lump wave and kink wave on a periodic wave background, including inelastic collisions of single lump wave and double kink wave, inelastic collisions of single lump wave and triple kink wave, evolution of double lump waves, fusion and fission of double lump waves and single kink wave, and inelastic collisions of double lump waves and a pair of kink waves. That is to say, the novelty of this article is that the obtained some new exact solutions can describe the interaction between lump waves, kink waves, and periodic waves. It can be seen that the test function method is an effective method for solving nonlinear evolution equations, and the research conclusions of this paper have potential application value for the study of nonlinear theory.</p></div>","PeriodicalId":792,"journal":{"name":"The European Physical Journal Plus","volume":"140 9","pages":""},"PeriodicalIF":2.9,"publicationDate":"2025-09-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145168872","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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