物理与天体物理最新文献_第3页

New Method for TiO2 Particle Detection in Plastic

IF 0.6 4区物理与天体物理

Bulletin of the Lebedev Physics Institute Pub Date : 2025-04-03 DOI: 10.3103/S1068335624602383

D. F. Aminev, E. E. Onishchenko, S. I. Chentsov

引用次数: 0

Turbulent Power: A Discriminator Between Sheaths and CMEs

IF 2.7 3区物理与天体物理

Solar Physics Pub Date : 2025-04-03 DOI: 10.1007/s11207-025-02457-5

Deep Ghuge, Debesh Bhattacharjee, Prasad Subramanian

引用次数: 0

A Laplacian-based quantum graph neural networks for quantum semi-supervised learning

IF 2.2 3区物理与天体物理

Quantum Information Processing Pub Date : 2025-04-03 DOI: 10.1007/s11128-025-04725-6

Hamed Gholipour, Farid Bozorgnia, Kailash Hambarde, Hamzeh Mohammadigheymasi, Javier Mancilla, Andre Sequeira, João Neves, Hugo Proença, Moharram Challenger

{"title":"A Laplacian-based quantum graph neural networks for quantum semi-supervised learning","authors":"Hamed Gholipour, Farid Bozorgnia, Kailash Hambarde, Hamzeh Mohammadigheymasi, Javier Mancilla, Andre Sequeira, João Neves, Hugo Proença, Moharram Challenger","doi":"10.1007/s11128-025-04725-6","DOIUrl":"10.1007/s11128-025-04725-6","url":null,"abstract":"<div><p>The Laplacian learning method has proven effective in classical graph-based semi-supervised learning, yet its quantum counterpart remains underexplored. This study systematically evaluates the Laplacian-based quantum semi-supervised learning (QSSL) approach across four benchmark datasets—Iris, Wine, Breast Cancer Wisconsin, and Heart Disease. By experimenting with varying qubit counts and entangling layers, we demonstrate that increased quantum resources do not necessarily lead to improved performance. Our findings reveal that the effectiveness of the method is highly sensitive to dataset characteristics, as well as the number of entangling layers. Optimal configurations, generally featuring moderate entanglement, strike a balance between model complexity and generalization. These results emphasize the importance of dataset-specific hyperparameter tuning in quantum semi-supervised learning frameworks.</p></div>","PeriodicalId":746,"journal":{"name":"Quantum Information Processing","volume":"24 4","pages":""},"PeriodicalIF":2.2,"publicationDate":"2025-04-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1007/s11128-025-04725-6.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143761777","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

Multiplexing technique using photodetector arrays for quasi-distributed intensity variation optical fiber sensors system

IF 4.6 2区物理与天体物理

Optics and Laser Technology Pub Date : 2025-04-03 DOI: 10.1016/j.optlastec.2025.112883

Rafael Menegardo , Arnaldo Leal-Junior

{"title":"Multiplexing technique using photodetector arrays for quasi-distributed intensity variation optical fiber sensors system","authors":"Rafael Menegardo , Arnaldo Leal-Junior","doi":"10.1016/j.optlastec.2025.112883","DOIUrl":"10.1016/j.optlastec.2025.112883","url":null,"abstract":"<div><div>This paper presents the development and characterization of a multiplexing technique for quasi-distributed optical fiber sensors based on the intensity variation detection. The technique is based on an array of photodetectors coupled to the optical fiber, where each lateral section of the optical fiber is analyzed as a sensor along the optical fiber cable. In this case, the polymer optical fiber (POF) is used due to its higher diameter and higher flexibility, which leads not only to easier coupling between the photodetector and the fiber, but also higher sensitivity for mechanical parameters detection. The proposed technique is tested under two configurations. In the first one, two sensors are developed in a single POF cable for curvature detection along the optical fiber, where the results indicated the feasibility of using such sensors to detect the curvature position at 4 different regions along the POF with a root mean squared error (RMSE) as small as 0.49 cm. Then, a 4 sensor array is developed for simultaneous force and position detection along the optical fiber, where the results indicated relative errors below 5 % on the force amplitude and position detection. Therefore, the quasi-distributed intensity variation sensors can be readily used in shape reconstruction applications, which can be integrated not only in different flexible structure, but also in textiles for wearable sensors for health monitoring and biomechanics assessment.</div></div>","PeriodicalId":19511,"journal":{"name":"Optics and Laser Technology","volume":"188 ","pages":"Article 112883"},"PeriodicalIF":4.6,"publicationDate":"2025-04-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143759986","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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

A hybrid metallic waveguide with meta-holes for long-distance terahertz field enhancement

IF 4.6 2区物理与天体物理

Optics and Laser Technology Pub Date : 2025-04-03 DOI: 10.1016/j.optlastec.2025.112917

Wei Chen , Yuanzhi Liu , Jiejun Peng , Min Zhang , Hong Su , Zhengfang Qian , Shuting Fan , Huawei Liang

{"title":"A hybrid metallic waveguide with meta-holes for long-distance terahertz field enhancement","authors":"Wei Chen , Yuanzhi Liu , Jiejun Peng , Min Zhang , Hong Su , Zhengfang Qian , Shuting Fan , Huawei Liang","doi":"10.1016/j.optlastec.2025.112917","DOIUrl":"10.1016/j.optlastec.2025.112917","url":null,"abstract":"<div><div>High-intensity terahertz (THz) field is crucial for various practical applications. Several structures have been used to achieve THz field enhancement, but the propagation distances of the high-intensity field can only be maintained at the wavelength or sub-wavelength scale. Here, a hybrid metallic waveguide with <em>meta</em>-holes (HMWMH) based on the combination of waveguide technologies and wavefront control methods is proposed to achieve THz field enhancement over a much longer propagation distance. By the phase modulation of <em>meta</em>-holes, THz waves incident on the waveguide can be converted into a guided mode and further focused at the center. To achieve the second field enhancement, the enhanced THz field at the focus is coupled into a triangular single ridge waveguide, which supports surface plasmon polaritons (SPPs) with deep-subwavelength mode widths and ultra-low loss. When the radius of the ridge tip and the gap between the tip and metallic plate are 15 and 100 μm, respectively, a hot spot area of 19.2 × 3.3 μm<sup>2</sup> (1.38 × 10<sup>-5</sup> <em>λ</em><sup>2</sup>) and a field enhancement of 689 times are achieved simultaneously in the simulation. Theoretically the high-intensity THz field can propagate over a distance of 1.8 m due to the ultra-low loss of the SPPs, which is several orders of magnitude larger than the wavelength. According to the design, an HMWMH prototype is fabricated, and the simulated and measured results are consistent with each other. By realizing long-distance THz field enhancement, the HMWMH can greatly enhance light-matter interactions, which can promote the development of integrated THz photonic devices, THz biophotonics, and THz nonlinear photonics.</div></div>","PeriodicalId":19511,"journal":{"name":"Optics and Laser Technology","volume":"188 ","pages":"Article 112917"},"PeriodicalIF":4.6,"publicationDate":"2025-04-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143759989","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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

Destructive Quantum Interference in Bicyclic Conjugated Hydrocarbons

IF 0.6 4区物理与天体物理

Bulletin of the Lebedev Physics Institute Pub Date : 2025-04-03 DOI: 10.3103/S1068335624602322

N. M. Shubin, A. A. Gorbatsevich

引用次数: 0

Investigating Solar Wind Outflows from Open–Closed Magnetic Field Structures Using Coordinated Solar Orbiter and Hinode Observations

IF 2.7 3区物理与天体物理

Solar Physics Pub Date : 2025-04-03 DOI: 10.1007/s11207-025-02438-8

Nawin Ngampoopun, Roberto Susino, David H. Brooks, Roberto Lionello, Lucia Abbo, Daniele Spadaro, Deborah Baker, Lucie M. Green, David M. Long, Stephanie L. Yardley, Alexander W. James, Marco Romoli, Silvio M. Giordano, Aleksandr Burtovoi, Federico Landini, Giuliana Russano

{"title":"Investigating Solar Wind Outflows from Open–Closed Magnetic Field Structures Using Coordinated Solar Orbiter and Hinode Observations","authors":"Nawin Ngampoopun, Roberto Susino, David H. Brooks, Roberto Lionello, Lucia Abbo, Daniele Spadaro, Deborah Baker, Lucie M. Green, David M. Long, Stephanie L. Yardley, Alexander W. James, Marco Romoli, Silvio M. Giordano, Aleksandr Burtovoi, Federico Landini, Giuliana Russano","doi":"10.1007/s11207-025-02438-8","DOIUrl":"10.1007/s11207-025-02438-8","url":null,"abstract":"<div><p>ESA/NASA’s Solar Orbiter (SO) enables us to study the solar corona at closer distances and from different perspectives, which helps us to gain significant insights into the origin of the solar wind. In this work, we present the analysis of solar wind outflows from two locations: a narrow open-field corridor and a small, mid-latitude coronal hole. These outflows were observed off-limb by the Metis coronagraph onboard SO and on-disk by the Extreme Ultraviolet Imaging Spectrometer (EIS) onboard Hinode. Magnetic field extrapolations suggest that the upflow regions seen in EIS were the sources of the outflowing solar wind observed with Metis. We find that the plasma associated with the narrow open-field corridor has higher electron densities and lower outflow velocities compared to the coronal hole plasma in the middle corona, even though the plasma properties of the two source regions in the low corona are found to be relatively similar. The speed of the solar wind from the open-field corridor also shows no correlation with the magnetic field expansion factor, unlike the coronal hole. These pronounced differences at higher altitudes may arise from the dynamic nature of the low-middle corona, in which reconnection can readily occur and may play an important role in driving solar wind variability.</p></div>","PeriodicalId":777,"journal":{"name":"Solar Physics","volume":"300 4","pages":""},"PeriodicalIF":2.7,"publicationDate":"2025-04-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1007/s11207-025-02438-8.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143761708","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

Exploring the effects of substitution site selectivity on structural transition and magnetocaloric effect in MnCoGe alloy

IF 2.3 3区物理与天体物理

Physics Letters A Pub Date : 2025-04-03 DOI: 10.1016/j.physleta.2025.130503

Hao Zhang, Lifu Bao, Xudong Zhang, Yongzhuo Sang, Yunzhe Ding, Jilong Gao, Danan Zhao, Hongwei Zhang, Ming Tian, Yuting Bai, Zhijie Li

{"title":"Exploring the effects of substitution site selectivity on structural transition and magnetocaloric effect in MnCoGe alloy","authors":"Hao Zhang, Lifu Bao, Xudong Zhang, Yongzhuo Sang, Yunzhe Ding, Jilong Gao, Danan Zhao, Hongwei Zhang, Ming Tian, Yuting Bai, Zhijie Li","doi":"10.1016/j.physleta.2025.130503","DOIUrl":"10.1016/j.physleta.2025.130503","url":null,"abstract":"<div><div>This study investigates the effects of Ga substitution at three distinct lattice sites (Mn, Co, Ge) in MnCoGe alloys to elucidate the relationship between substitution sites and phase transition regulation. The results demonstrate site-dependent efficiency in phase transition control: Ga substitution at Mn sites effectively lowers structural transition temperatures while enabling coupled magneto-structural transitions, causing the large magnetocaloric effects; substitution at Co sites exhibits the unusual capability to only tune the structural transition of cooling process into the Curie temperature window; conversely, substitution at Ge sites shows negligible phase transition modulation. These findings systematically map substitution site efficacy to transition tuning capabilities and their resultant MCE magnitudes, providing critical guidance for strategic site selection targeting enhanced magnetocaloric performance in solid-state refrigeration systems.</div></div>","PeriodicalId":20172,"journal":{"name":"Physics Letters A","volume":"545 ","pages":"Article 130503"},"PeriodicalIF":2.3,"publicationDate":"2025-04-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143759972","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

An adaptive moiré sensor for spectro-polarimetric hyperimaging

IF 35 1区物理与天体物理

Nature Photonics Pub Date : 2025-04-03 DOI: 10.1038/s41566-025-01650-z

Haoning Tang, Beicheng Lou, Fan Du, Guangqi Gao, Mingjie Zhang, Xueqi Ni, Evelyn Hu, Amir Yacoby, Yuan Cao, Shanhui Fan, Eric Mazur

{"title":"An adaptive moiré sensor for spectro-polarimetric hyperimaging","authors":"Haoning Tang, Beicheng Lou, Fan Du, Guangqi Gao, Mingjie Zhang, Xueqi Ni, Evelyn Hu, Amir Yacoby, Yuan Cao, Shanhui Fan, Eric Mazur","doi":"10.1038/s41566-025-01650-z","DOIUrl":"https://doi.org/10.1038/s41566-025-01650-z","url":null,"abstract":"<p>Moiré photonic structures permit the engineering of optical band structures and light–matter interactions, offering new opportunities in photonics and optoelectronics, paving the way for new nanophotonic applications such as ultra-low threshold lasing, and versatile nonlinear and quantum light sources; however, the lack of in situ tunability has limited the potential of these structures until now. For example, the lack of control of the twist angle is an obstacle to high-resolution material spectroscopy and the development of new applications that require moiré optical properties. Here we present a microelectromechanical system (MEMS)-integrated twisted moiré photonic crystal sensor with a tunable interlayer distance and twist angle. The MEMS actuators modulate the wavelength and polarization resonances of the photonic crystal sensor via a twist- and gap-tuned moiré scattering effect. Using a reconstruction algorithm, this chip-based sensor can be used to simultaneously resolve the spectrum and polarization state of a wide-band signal in the telecommunications range and the full Poincaré sphere. We also demonstrate hyperspectral and hyperpolarimetric imaging using this single sensor. Our research illustrates some of the remarkable applications of multidimensional control of degrees of freedom in twisted moiré photonic platforms and establishes a scalable pathway towards creating comprehensive flat-optics devices suitable for versatile light manipulation and information processing.</p>","PeriodicalId":18926,"journal":{"name":"Nature Photonics","volume":"32 1","pages":""},"PeriodicalIF":35.0,"publicationDate":"2025-04-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143766453","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"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

Free fermions under adaptive quantum dynamics

IF 6.4 2区物理与天体物理

Quantum Pub Date : 2025-04-03 DOI: 10.22331/q-2025-04-03-1685

Vikram Ravindranath, Zhi-Cheng Yang, Xiao Chen

{"title":"Free fermions under adaptive quantum dynamics","authors":"Vikram Ravindranath, Zhi-Cheng Yang, Xiao Chen","doi":"10.22331/q-2025-04-03-1685","DOIUrl":"https://doi.org/10.22331/q-2025-04-03-1685","url":null,"abstract":"We study free fermion systems under adaptive quantum dynamics consisting of unitary gates and projective measurements followed by corrective unitary operations. We further introduce a classical flag for each site, allowing for an active or inactive status which determines whether or not the unitary gates are allowed to apply. In this dynamics, the individual quantum trajectories exhibit a measurement-induced entanglement transition from critical to area-law scaling above a critical measurement rate, similar to previously studied models of free fermions under continuous monitoring. Furthermore, we find that the corrective unitary operations can steer the system into a state characterized by charge-density-wave order. Consequently, an additional phase transition occurs, which can be observed at both the level of the quantum trajectory and the quantum channel. We establish that the entanglement transition and the steering transition are fundamentally distinct. The latter transition belongs to the parity-conserving (PC) universality class, arising from the interplay between the inherent fermionic parity and classical labelling. We demonstrate both the entanglement and the steering transitions via efficient numerical simulations of free fermion systems, which confirm the PC universality class of the latter.","PeriodicalId":20807,"journal":{"name":"Quantum","volume":"73 1","pages":""},"PeriodicalIF":6.4,"publicationDate":"2025-04-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143766731","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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