Article
Optics
Zhuang Wang, Zheng Yuan, Yuan Gao, Wenxiang Yan, Chunjuan Liang, Zhi-Cheng Ren, Xi-Lin Wang, Jianping Ding, Hui-Tian Wang
Summary: This study introduces a novel curvilinear optical vortex beam called twin curvilinear vortex beams (TCVBs), with specific intensity and phase distribution, and demonstrates its potential applications in optical tweezers through simulation and experiment.
Article
Multidisciplinary Sciences
Gaurav Nirala, Siva T. Pradyumna, Ashok Kumar, Alberto M. Marino
Summary: The ability to encode and transmit information using the temporal and spatial degrees of freedom of quantum states of light is crucial for an efficient quantum network. However, there is still a lack of control required to fully utilize the high dimensionality of the spatial degree of freedom. In this study, we encode information in the spatial correlations of entangled twin beams, taking advantage of their dependence on the angular spectrum of the pump for four-wave mixing. We demonstrate that the encoded information can only be extracted through joint spatial measurements of the twin beams, without modifying the temporal quantum correlations.
Article
Optics
Miller Eaton, Rajveer Nehra, Aye Win, Olivier Pfister
Summary: The proposed Heisenberg-limited quantum interferometer uses twin optical beams with indistinguishably subtracted photons to achieve Heisenberg-limited performance and direct fringe reading. A feasible experimental realization using photon-number correlated sources, such as nondegenerate parametric down-conversion, was proposed for performance analysis in the presence of loss and detector inefficiency.
Article
Construction & Building Technology
Jiacheng Yang, Jeung-Hwan Doh, Kai Yan, Xin Zhang
Summary: This study investigated the shear behavior of UHPC beams and found that the shear span to depth ratio is inversely proportional to the shear bearing capacity. A comparative study was conducted to evaluate the existing shear capacity prediction formulas and a new modified formula was proposed.
CASE STUDIES IN CONSTRUCTION MATERIALS
(2022)
Article
Physics, Multidisciplinary
K. Laiho, T. Dirmeier, G. Shafiee, Ch Marquardt
Summary: The authors investigate the temporal characteristics of heralded states from narrowband parametric down-conversion sources and consider the effects of multiphoton contributions, unbalanced beam splitter ratio, and optical losses. The study provides a useful tool for optimizing the choice of parameters for parametric down-conversion sources and offers insights for driving quantum optical applications.
NEW JOURNAL OF PHYSICS
(2023)
Article
Engineering, Multidisciplinary
Qiaoyu Ma, Mario Solis, Jose Daniel Rodriguez-Mariscal, Pedro Galvin
Summary: This paper presents a damage identification method for beam-type structures based on wavelet analysis, utilizing Damage Locating Index (DLI) and Damage Severity Index (DSI) to determine the location and severity of damage. The method is applicable with relatively few measurement points and can use reference values from static analysis for damage evaluation.
Article
Engineering, Civil
Hosein Naderpour, Farzad Ghasemi-Meydansar, Mohammad Haji
Summary: Many experimental studies have investigated the adverse effects of localized corrosion of bars on the behavior of reinforced concrete structures. The reduction in steel bar cross-sectional area due to corrosion diminishes the bearing capacity and weakens the interaction characteristics between bar and concrete, resulting in reduced performance of reinforced concrete as a composite material. This study investigated the effect of artificially localized corrosion of reinforcement on the structural behavior of reinforced concrete beams, with parameters including the length and location of the localized corroded section.
Article
Physics, Multidisciplinary
Diego Guzman-Silva, Gabriel Caceres-Aravena, Rodrigo A. Vicencio
Summary: In this study, interorbital coupling is experimentally demonstrated using femtosecond laser writing technique, showing that fundamental and excited orbital states can be coupled at different spatial positions. A solution for a spatial mode converter device is proposed, and a trimer configuration is suggested as a phase beam splitter for multiplexing and interference-based photonic concatenated operations.
PHYSICAL REVIEW LETTERS
(2021)
Article
Engineering, Marine
Yin Zhang, Jun Guo, Tiantian Jia, Haoyue Cheng
Summary: This paper proposes a frequency-based method for ship damage identification using neural networks. Experimental results show that the proposed method can accurately identify the damage location, with the quantification error decreasing as the damage extent increases.
Article
Engineering, Civil
Jiacheng Yang, Kai Yan, Jeung-Hwan Doh, Xin Zhang
Summary: This study investigates the under-fire performance of shear-dominant UHPC beams. It is found that the shear failure modes of beams exposed to fire are different from those observed at ambient temperatures. Additionally, the fire resistance increases significantly with the decrease of load ratio and shear span to effective depth ratio.
ENGINEERING STRUCTURES
(2023)
Article
Optics
Hailong Wang, Zhongxing Fu, Jun Chen, Yan Shi, Shangzhong Jin, Chunliu Zhao
Summary: In this study, a quantum-enhanced fiber optic sensor combining single-few-single (SFS) mode fiber structure and two-mode squeezed state light source is proposed. The sandwiched structure is prepared using the fusion way without offset, ensuring stability of the transmission process and mode. The sensor is tested for curvature and temperature sensing, achieving enhanced signal-noise ratio (SNR) and sensing sensitivity compared to a double-channel light source.
OPTICS AND LASER TECHNOLOGY
(2023)
Article
Construction & Building Technology
Jin Wu, Duo Liu, Xudong Chen, Jiandong Zhang
Summary: This study proposes a large key-tooth shear key to solve the problems of low shear bearing capacity and complex collocation of conventional concrete shear keys. Through experimental testing and finite element analysis, the shear capacity and damage modes of the large key-tooth shear key were studied. Multiple linear regression equations were established to evaluate the load-carrying capacity of concrete shear keys with large key teeth.
JOURNAL OF BUILDING ENGINEERING
(2023)
Article
Engineering, Civil
M. Corrado, G. Ventura, A. Carpinteri
Summary: This study reports on a series of experimental bending tests conducted on reinforced concrete members without transverse reinforcement, aiming to investigate the flexural to shear to crushing failure mode transition. The effects of various longitudinal reinforcement amounts, beam depths, and beam slendernesses were examined. The experimental data analysis encompasses the identification of the overall mechanical response, assessment of ultimate load, and detection of critical cracks. The results provide an effective and synthetic prediction of the failure mode transition based on dimensionless numbers and highlight weaknesses in current codes regarding the shear capacity assessment.
ENGINEERING STRUCTURES
(2022)
Article
Engineering, Civil
Kai Wu, Shiqi Lin, Xiaoyi Liu, Fanshen Mao, Chengwei Tan
Summary: The study confirmed the influence of shear span ratio and damage form on the load bearing capacity of prefabricated partially encased composite beams. It proposed methods for calculating shear capacity and predicting bending capacity, as well as introduced reduction factors to consider asymmetric damage and weakened bending capacity of specimens without threaded rods. The calculated results matched well with experimental ones, providing a reliable reference for engineering design purposes.
INTERNATIONAL JOURNAL OF STRUCTURAL STABILITY AND DYNAMICS
(2021)
Article
Construction & Building Technology
C. Lejouad, B. Richard, P. Mongabure, S. Capdevielle, F. Ragueneau
Summary: This study aims to characterize the dissipation capacity and damping capacity of corroded RC beams using both quasi-static and dynamic tests. The experimental results show that the corrosion rate has an influence on the dissipation capacity of RC structures, and there is consistency between quasi-static and dynamic results.
MATERIALS AND STRUCTURES
(2022)
Article
Physics, Applied
M. Drong, T. Fordos, H. Y. Jaffres, J. Perina, K. Postava, P. Ciompa, J. Pistora, H-J Drouhin
Summary: This study presents a semiclassical model for spin-injected vertical-cavity surface-emitting lasers with local optical anisotropies, focusing on highly anisotropic spin lasers. A generalized matrix formalism for extracting laser modes and a coupled-mode theory for studying time dependence of laser modes are introduced. The theory, based on circularly polarized optical modes, demonstrates advantages in designing and optimizing spin-VCSEL structures with high-contrast gratings for applications in terahertz range polarization modulation and compact terahertz sources.
PHYSICAL REVIEW APPLIED
(2021)
Article
Optics
Jan Perina, Vaclav Michalek, Radek Machulka, Ondrj Haderka
Summary: Selective post-selection of one beam out of a system of three correlated beams with bi-partite photon-number correlations leads to joint photon-number distributions with checkered patterns. The experimental and theoretical analysis shows nonclassical properties of these states as they vary with the ratio of correlated and anti-correlated contributions, confirmed by 2D histograms reconstructed by maximum-likelihood approach. The investigations suggest potential applications in two-photon excitations of atoms and molecules as well as two-photon spectroscopy.
Article
Physics, Multidisciplinary
Joanna K. Kalaga, Wieslaw Leonski, Radoslaw Szczesniak, Jan Perina
Summary: We investigate the relationship between the states of three-qubit systems and linear entropy, as well as measures of coherence such as degree of coherence, first- and second-order correlation functions. We demonstrate that qubit-qubit states exhibit strong entanglement when the linear entropy falls within a certain range of values. Additionally, we derive the conditions for the boundary values of linear entropy, which are parameterized by measures of coherence.
Article
Engineering, Electrical & Electronic
Mariusz Drong, Maciej Dems, Jan Perina, Tibor Fordos, Henri-Yves Jaffres, Kamil Postava, Henri-Jean Drouhin
Summary: This study presents a theoretical framework that combines the laser rate equations and cavity perturbation theory for micro-cavity lasers with optical anisotropies. By deriving polarization-resolved coupled-mode equations, the method offers physical insights and accuracy comparable to finite-difference time-domain methods, saving time and suitable for semi-analytic studies.
JOURNAL OF LIGHTWAVE TECHNOLOGY
(2022)
Article
Multidisciplinary Sciences
Shilan Abo, Grzegorz Chimczak, Anna Kowalewska-Kudlaszyk, Jan Perina, Ravindra Chhajlany, Adam Miranowicz
Summary: We describe a novel type of blockade, called hybrid photon-phonon blockade, generated by linear coupling of photonic and phononic modes. By mixing the photonic and phononic modes, which do not exhibit blockade individually, we are able to generate the hybrid photon-phonon blockade.
SCIENTIFIC REPORTS
(2022)
Article
Physics, Multidisciplinary
Artur Barasinski, Jan Perina Jr, Antonin Cernoch
Summary: Identification and quantification of quantum correlations are crucial for understanding and manipulating quantum devices and processes. We have developed and implemented a general method to quantify different forms of quantum correlations using experimental intensity moments up to the fourth order. These moments allow for the precise determination of global and marginal impurities of two-beam Gaussian fields, enabling the assessment of steering, tight lower and upper bounds for negativity, and the use of Kullback-Leibler divergence as a quantifier for nonseparability. The method has been successfully demonstrated on experimental twin beams and squeezed super-Gaussian beams. It can be readily applied to characterize quantum correlations in multibeam Gaussian fields.
PHYSICAL REVIEW LETTERS
(2023)
Article
Quantum Science & Technology
Jan Perina, Adam Miranowicz, Grzegorz Chimczak, Anna Kowalewska-Kudtaszyk
Summary: This paper discusses equivalent approaches to determine the eigenfrequencies of the Liouvillians of open quantum systems using the solution of the Heisenberg-Langevin equations and the corresponding equations for operator moments. The equivalence of both approaches is demonstrated by analyzing a simple damped two-level atom. The presented approach via the Heisenberg-Langevin equations reveals the structure and eigenfrequencies of quantum exceptional and diabolical points.
Article
Optics
Mariusz Drong, Jan Perina, Tibor Fordos, Henri Y. Jaffres, Kamil Postava, Henri-Jean Drouhin
Summary: It is found that spin-injected vertical-cavity surface-emitting lasers (spin-VCSELs) exhibit interesting functionalities when considering the linear gain anisotropy. Using the extended spin-flip model (SFM), exceptional points (EPs) are predicted in spin-VCSELs along with two interesting phenomena: polarization switching and frequency comb generation. These effects have great technological potential and are not limited to spin-VCSEL technology. The concept of anisotropy-engineered non-Hermitian microlasers and their polarization dynamics near EPs are discussed.
Proceedings Paper
Optics
Kishore Thapliyal, Jan Perina
Summary: This article systematically analyzes the generation of Stokes-anti-Stokes photon pairs in Raman scattering and provides suitable conditions for photon pair generation. In addition to the Raman active material properties and pump power, non-zero mean phonon number and losses in the phonon mode are also relevant parameters. Raman active materials with stronger anti-Stokes coupling are suitable for photon pair generation, even for non-zero thermal phonons as long as phonon losses are negligible.
22ND POLISH-SLOVAK-CZECH OPTICAL CONFERENCE ON WAVE AND QUANTUM ASPECTS OF CONTEMPORARY OPTICS
(2022)
Proceedings Paper
Engineering, Electrical & Electronic
Mariusz Drong, Jan Perina, Maciej Dems, Tomasz G. Czyszanowski, Tibor Fordos, Henri Jaffres, Kamil Postava, Henri-Jean M. Drouhin
Summary: We present a nonlinear coupled-mode theory for anisotropic microcavity lasers, particularly for birefringent spin-lasers. The model can be used to investigate the effects of spin modulation and grating parameters on the performance of realistic grating-based spin-lasers.
QUANTUM SENSING AND NANO ELECTRONICS AND PHOTONICS XVIII
(2022)
Article
Optics
Jan Perina, Pavel Pavlicek, Vaclav Michalek, Radek Machulka, Ondrej Haderka
Summary: This study derives nonclassicality criteria for general N-dimensional optical fields, which involve intensity moments, photon-number distribution probabilities, or combinations of both. The Hillery criteria for sums of even or odd photon numbers are generalized to N-dimensional fields. These criteria are then applied to an experimental three-mode optical field containing two types of photon-pair contributions, and the accompanying nonclassicality depths are used for performance comparison.
Article
Physics, Multidisciplinary
Fabrizio Minganti, Ievgen I. Arkhipov, Adam Miranowicz, Franco Nori
Summary: Research has found that the laser threshold is a second-order phase transition associated with U(1) spontaneous symmetry breaking, but the fundamental transition of SLLM is actually a different phenomenon called Liouvillian spectral collapse. Furthermore, by considering additional dephasing, a second-order phase transition has been observed, despite the absence of symmetry breaking.
PHYSICAL REVIEW RESEARCH
(2021)
Article
Optics
Jan Perina, Vaclav Michalek, Radek Machulka, Ondrej Haderka
Summary: The research shows that the twin beams exhibit anticorrelations in photon-number fluctuations in the signal and idler beams under specific conditions, with sub-Poissonian photon-number statistics. The postselected fields are reconstructed from experimental data using the maximum likelihood method, and their nonclassical properties are analyzed and quantified using appropriate criteria. Comparisons are made between the postselected fields obtained with actual and ideal photon-number-resolved detectors.
Article
Optics
Ievgen I. Arkhipov, Fabrizio Minganti, Adam Miranowicz, Franco Nori
Summary: Intense research has been conducted on constructing high-order exceptional points in dissipative systems. Previous methods mainly focused on spatial networks of coupled modes or utilization of synthetic dimensions. A recent simple and effective method has been introduced for engineering non-Hermitian Hamiltonians with high-order quantum EPs.
Article
Optics
Kishore Thapliyal, Jan Perina
Summary: The quantum model of the Raman process examines nonclassical correlations between photons in the Stokes and anti-Stokes fields, analyzing the impact of various parameters on these correlations. The study also reveals conditions for the Stokes and anti-Stokes fields to be composed of only photon pairs, allowing for nonzero mean thermal phonon numbers.
