The European Physical Journal D最新文献

{"title":"From certainty to chance: probabilistic insights into quantum control","authors":"Randa Herzallah,&nbsp;Abdessamad Belfakir","doi":"10.1140/epjd/s10053-024-00848-0","DOIUrl":"10.1140/epjd/s10053-024-00848-0","url":null,"abstract":"<p>This study introduces an innovative control methodology designed specifically for quantum physical systems. It bridges a critical gap by accounting for the full spectrum of uncertainties and noise that could affect the time evolution of these systems. In contrast to conventional methods, our pioneering approach utilizes probability density functions (pdfs) to characterize quantum dynamics, providing a more detailed and accurate description of their temporal behavior. We propose a strategy that seeks to minimize the discrepancy between the actual pdf, which encapsulates the combined dynamics of the quantum system and an external electric field, and a desired pdf that aligns with the system’s intended outcomes. This strategy marks a significant shift from traditional quantum control techniques. Initially, we present a solution for controlling quantum systems defined by general pdfs. This solution is then demonstrated on quantum systems described by Gaussian pdfs, with an in-depth account of the resulting optimized controller’s structure. The study culminates with practical demonstrations, showcasing the approach’s efficacy and practicality, thus endorsing its potential as a formidable instrument in quantum control.</p>","PeriodicalId":789,"journal":{"name":"The European Physical Journal D","volume":"78 5","pages":""},"PeriodicalIF":1.5,"publicationDate":"2024-05-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1140/epjd/s10053-024-00848-0.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141138389","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}

{"title":"Electron-driven processes for perfluoronitriles","authors":"Nirav Thakkar,&nbsp;Dhaval Chauhan,&nbsp;Smruti Parikh,&nbsp;Chetan Limbachiya","doi":"10.1140/epjd/s10053-024-00858-y","DOIUrl":"10.1140/epjd/s10053-024-00858-y","url":null,"abstract":"<div><p>We report the results of the study on electron-driven molecular processes for the perfluoronitriles, C₃F₅N and C₄F₇N for a wide energy range, from the ionisation potential to 5000 eV. These compounds have been shown to have extremely low global warming potential, suggesting they could be useful in gas discharges and plasma reactors. Calculations of ionisation cross sections (<i>Q</i>_ion) are made using the complex scattering potential-ionisation contribution (CSP-ic) method and are shown to be in good agreement with the available data. Elastic (<i>Q</i>_el), inelastic (<i>Q</i>_inel) and total (<i>Q</i>_T) cross sections are computed through spherical complex optical potential formalism. We have recently developed two-parameter semi-empirical method (2p-SEM) for large molecules with 55 &lt; Z &lt; 95 to report <i>Q</i>_el and <i>Q</i>_T. This work is a maiden report of <i>Q</i>_el and <i>Q</i>_T for C₃F₅N and C₄F₇N. We present various correlation studies between the cross sections and target parameters, leading to a prediction of polarizability. We have derived dielectric constant using number density and molar mass and have correlated <i>Q</i>_ion (max) with dielectric constant.</p><h3>Graphical abstract</h3><div><figure><div><div><picture><source><img></source></picture></div></div></figure></div></div>","PeriodicalId":789,"journal":{"name":"The European Physical Journal D","volume":"78 5","pages":""},"PeriodicalIF":1.5,"publicationDate":"2024-05-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141134411","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}

{"title":"Quantum information-theoretical analysis on the two-photon transitions in hydrogen isoelectronic ions under plasma confinement","authors":"S. Mondal,&nbsp;S. K. Chaudhuri,&nbsp;J. K. Saha,&nbsp;P. K. Mukherjee,&nbsp;B. Fricke","doi":"10.1140/epjd/s10053-024-00840-8","DOIUrl":"10.1140/epjd/s10053-024-00840-8","url":null,"abstract":"<p>Quantum information-theoretical measure in terms of Shannon and Fisher entropy in conjugate position and momentum spaces provides important information about the localization/delocalization patterns of the inter-atomic charge density under arbitrary confining environments. In this article, we have attempted to employ such measures to the ground, excited, and the virtual states arising out of two-photon transitions (<span>(1srightarrow nl)</span>; <span>(n=2-4)</span>, <span>(l=0,2)</span>) of weakly coupled classical plasma embedded H iso-electronic ions (nuclear charge, <span>(Z = 2 - 5)</span>). The wavefunction for the said states is essentially a linear combination of the Slater-type orbitals, the coefficients of which are generated from a fourth-order time-dependent perturbation theory within the variational framework. A complementary nature has been noted in the Shannon and Fisher measures versus the plasma screening parameter plot in the conjugate spaces. A novel scaling law has been proposed to replicate the variation of the Shannon and Fisher entropy <i>w.r.t.</i> <i>Z</i> for the virtual as well as real 2<i>p</i> states of free and plasma confined ions.</p>","PeriodicalId":789,"journal":{"name":"The European Physical Journal D","volume":"78 5","pages":""},"PeriodicalIF":1.5,"publicationDate":"2024-05-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141140131","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}

{"title":"Refractive index for the mechanical refraction of a relativistic particle","authors":"Bikram Keshari Behera,&nbsp;Surendra Kumar Gour,&nbsp;Shyamal Biswas","doi":"10.1140/epjd/s10053-024-00849-z","DOIUrl":"10.1140/epjd/s10053-024-00849-z","url":null,"abstract":"<p>We have analytically determined the refractive index for the mechanical refraction of a relativistic particle for its all possible speeds. We have critically analysed the importance of Descartes’ metaphysical theory and extended it in this regard. We have considered the conservation of the tangential component of the relativistic momentum and the relativistic energy of the particle in the process of the mechanical refraction within the optical-mechanical analogy. Our result for the mechanical refractive index exactly matches with the forms of both the Fermat’s result on Snell’s law of optical refraction at the ultra-relativistic limit and the Descartes’ metaphysical result on the pseudo-Snell law of optical refraction at the non-relativistic limit.</p><p>Mechanical refraction from medium-1 to medium-2 for <span>(U2&gt;U1)</span></p>","PeriodicalId":789,"journal":{"name":"The European Physical Journal D","volume":"78 5","pages":""},"PeriodicalIF":1.5,"publicationDate":"2024-05-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141054063","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}

{"title":"Radiative recombination of an electron on two protons: oscillator strengths","authors":"Tamaz Kereselidze,&nbsp;Irakli Noselidze,&nbsp;Zaal Machavariani","doi":"10.1140/epjd/s10053-024-00847-1","DOIUrl":"10.1140/epjd/s10053-024-00847-1","url":null,"abstract":"<p>The hydrogen molecular ion, <span>(H_2^+)</span>, is considered in the fixed nuclei approximation. The oscillator strengths relevant to free-bound transitions in <span>(H_2^+)</span> are presented as asymptotic expansions in an inverse power of the internuclear separation, which is assumed to be large. The asymptotic technique leads to an algebraic representation of the oscillator strengths, contrasting with numerical tables.</p>","PeriodicalId":789,"journal":{"name":"The European Physical Journal D","volume":"78 5","pages":""},"PeriodicalIF":1.5,"publicationDate":"2024-05-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141054038","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}

{"title":"Calculations of positron scattering from small molecules","authors":"N. A. Mori,&nbsp;I. Bray,&nbsp;D. V. Fursa","doi":"10.1140/epjd/s10053-024-00853-3","DOIUrl":"10.1140/epjd/s10053-024-00853-3","url":null,"abstract":"<p>Recently, convergent close-coupling calculations have been completed for positron scattering from the carbon and oxygen atomic targets. These, together with previously completed calculations for atomic hydrogen, are utilized to perform positron scattering calculations for molecular hydrogen (<span>(hbox {H}_2)</span>), molecular oxygen (<span>(hbox {O}_2)</span>), diatomic carbon (<span>(hbox {C}_2)</span>), carbon monoxide (CO), carbon dioxide (<span>(hbox {CO}_2)</span>), ozone (<span>(hbox {O}_3)</span>), water (<span>(hbox {H}_2hbox {O})</span>), and methane (<span>(hbox {CH}_4)</span>) through a modified independent atom approach. For these molecules, positronium-formation, direct ionization, electron-loss, elastic, total electronic excitation, total inelastic, and total cross sections are obtained for energies between 0.1 and 5000 eV. There is, in general, good agreement between the current results and past experiments for most transitions, particularly at high energies where this approach is expected to be most accurate.</p>","PeriodicalId":789,"journal":{"name":"The European Physical Journal D","volume":"78 5","pages":""},"PeriodicalIF":1.5,"publicationDate":"2024-05-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1140/epjd/s10053-024-00853-3.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141045761","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}

{"title":"Enhanced 1D photonic crystal biosensor for blood components and blood infection detection","authors":"Donia M. Nasr,&nbsp;Samia I. Mostafa,&nbsp;Mona A. El Naggar","doi":"10.1140/epjd/s10053-024-00838-2","DOIUrl":"10.1140/epjd/s10053-024-00838-2","url":null,"abstract":"<div><p>The present work proposes a unidimensional asymmetric photonic crystal (1D PhC) sensor suitable for detecting blood components for both healthy and infected conditions. The proposed design is an enhanced efficient biosensor that distinguishes <i>five</i> blood components, namely; platelets, plasma, haemoglobin, RBCs and WBCs. The present work biosensor is designed as N binary nanostructured layers of SiO₂ and PbS, with a defect layer, <i>D</i>, to form an asymmetric (<i>P</i>|<i>Q</i>)^<i>N</i>/2<i>D</i> (<i>P</i>|<i>Q</i>)^<i>N</i>/2 model. Infrared radiation is directed on the PhC in two cases: (i) normal incidence and (ii) oblique incidence with transverse electric mode (TEM) and transverse magnetic mode (TMM). The EMW propagation through the PhC layers is simulated using the well-established transfer matrix that is implemented using MATLAB software. The present work PhC design produces output transmission pulse peaks for all samples under investigation, both healthy and infected. The sensitivity, <i>S</i>, FoM, FWHM and <i>Q</i>_f are calculated to assess the proposed biosensor performance. The presented biosensor exhibits better sensitivity (<i>S</i>), in the case of oblique incidence (TEM) than the normal incidence. Moreover, the performance of the proposed biosensor is validated by calculating another type of sensitivity (<i>S</i>′) for the five infected blood-component samples when related to their corresponding healthy ones. Furthermore, the variation of sensitivity with the angle of incidence is investigated showing a significant rise in the sensitivity with the increase in the incident angle. The proposed biosensor exhibits maximum sensitivity; <i>S</i>_max = 625.0 nm/RIU for infected plasma in the case of normal incidence, while <i>S</i>_max = 1025.4 nm/RIU for infected Hb (TEM) and <i>S</i>_max = 675.0 nm/RIU for infected WBCs (TMM). The proposed PhC biosensor is capable of early detection of some diseases such as leukaemia, dengue virus and malaria. The proposed biosensor performance is compared to recent literature exhibiting higher sensitivity, thus presenting an accurate method of further blood disease detection.</p><h3>Graphical abstract</h3>\u0000<div><figure><div><div><picture><source><img></source></picture></div></div></figure></div></div>","PeriodicalId":789,"journal":{"name":"The European Physical Journal D","volume":"78 5","pages":""},"PeriodicalIF":1.5,"publicationDate":"2024-05-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141025557","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}

{"title":"BEB-based models for ionisation cross sections of electron and positron impact with diatomic molecules","authors":"V. Graves","doi":"10.1140/epjd/s10053-024-00852-4","DOIUrl":"10.1140/epjd/s10053-024-00852-4","url":null,"abstract":"<p>The ionising interactions of high-energy particles with molecules have applications in many areas. Despite this, some areas, including positron scattering, lack experimental data due to difficulties in performing experiments. Here, quick and simple methods for computing direct electron and positron impact ionisation cross sections are presented. These calculations, performed using the open-source software RAPID-CS, can provide a complete data set as a first approximation for when experimental, or more detailed computational work is not available. The cross-sectional data set includes the total, partial/fragment-specific, single-differential, average secondary electron energy and stopping power cross sections. The molecules N<span>(_2)</span>, O<span>(_2)</span> and CO were chosen to study due to the availability of positron scattering data. An overall good agreement with experimental and other computational results is presented.</p><p>Direct electron (left) and positron right) impact partial ionisation cross sections for N2. Total cross section: red, <span>(N^{+}_{2})</span> partial cross section: blue, N<span>(^{+})</span> partial cross section: green.electron: solid lines: BEB, experimental measurements by Lindsay and Mangan [36]:Ürosses, Straub et al. [37]: stars, Opel et al. [39]: squares. Positron: solid lines: BEB0, Dashed lines: BEBA, Marler and Surko [23]: red crosses, Bluhme et al. [24]: stars</p>","PeriodicalId":789,"journal":{"name":"The European Physical Journal D","volume":"78 5","pages":""},"PeriodicalIF":1.5,"publicationDate":"2024-05-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1140/epjd/s10053-024-00852-4.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140941746","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}

{"title":"Graphene-based magnetically tunable multi-band terahertz absorber with switchable frequency","authors":"Zhenyan Wei,&nbsp;Yannan Jiang","doi":"10.1140/epjd/s10053-024-00845-3","DOIUrl":"10.1140/epjd/s10053-024-00845-3","url":null,"abstract":"<p>A magnetically tunable multi-band switchable frequency terahertz (THz) absorber based on graphene is proposed, and its absorption performance is analyzed using the <span>(4 times 4)</span> transfer matrix method. The results indicate that the proposed absorber achieves absorption amplitude tuning across multiple switchable THz frequencies by adjusting the static bias magnetic field. Moreover, both absorption and modulation depths exceed 90% for the left-handed circularly polarized wave. This performance can be attributed to the unequal Landau levels distribution of graphene in the quantum domain and the properties of photonic crystals, which include photonic bandgaps and optical localization. This study may have significant potential in various frequency-switchable components, such as circular polarization sensors, circular polarizers, and magnetic circular dichroism optical detectors.</p>","PeriodicalId":789,"journal":{"name":"The European Physical Journal D","volume":"78 5","pages":""},"PeriodicalIF":1.5,"publicationDate":"2024-05-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140941212","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}

{"title":"Resonant generation of electromagnetic modes in nonlinear electrodynamics: quantum perturbative approach","authors":"Ilia Kopchinskii,&nbsp;Petr Satunin","doi":"10.1140/epjd/s10053-024-00850-6","DOIUrl":"10.1140/epjd/s10053-024-00850-6","url":null,"abstract":"<p>The paper studies resonant generation of higher-order harmonics in a closed cavity in Euler-Heisenberg electrodynamics from the point of view of pure quantum field theory. We consider quantum states of the electromagnetic field in a rectangular cavity with conducting boundary conditions and calculate the cross section for the merging of three quanta of cavity modes into a single one (<span>(3 rightarrow 1)</span> process) as well as the scattering of two cavity mode quanta (<span>(2 rightarrow 2)</span> process). We show that the amplitude of the merging process vanishes for a cavity with an arbitrary aspect ratio and provide an explanation based on plane wave decomposition for cavity modes. Contrary, the scattering amplitude is nonzero for specific cavity aspect ratio. This <span>(2 rightarrow 2)</span> scattering is a crucial elementary process for the generation of a quantum of a high-order harmonics with frequency <span>(2omega _1 - omega _2)</span> in an interaction of two coherent states of cavity modes with frequencies <span>(omega _1)</span> and <span>(omega _2)</span>. For this process, we calculate the mean number of quanta in the final state in a model with dissipation, which supports the previous result of resonant higher-order harmonics generation in an effective field theory approach (Kopchinskii and Satunin in Phys Rev A 105:013508, 2022).</p>","PeriodicalId":789,"journal":{"name":"The European Physical Journal D","volume":"78 5","pages":""},"PeriodicalIF":1.5,"publicationDate":"2024-05-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140941411","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}