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arXiv 2024年

作者： Cochran, Tyler A. Jobst, Bernhard Rosenberg, Eliotte Lensky, Yuri D. Gyawali, Gaurav Eassa, Norhan Will, Melissa Abanin, Dmitry Acharya, Rajeev Beni, Laleh Aghababaie Andersen, Trond I. Ansmann, Markus Arute, Frank Arya, Kunal Asfaw, Abraham Atalaya, Juan Babbush, Ryan Ballard, Brian Bardin, Joseph C. Bengtsson, Andreas Bilmes, Alexander Bourassa, Alexandre Bovaird, Jenna Broughton, Michael Browne, David A. Buchea, Brett Buckley, Bob B. Burger, Tim Burkett, Brian Bushnell, Nicholas Cabrera, Anthony Campero, Juan Chang, Hung-Shen Chen, Zijun Chiaro, Ben Claes, Jahan Cleland, Agnetta Y. Cogan, Josh Collins, Roberto Conner, Paul Courtney, William Crook, Alexander L. Curtin, Ben Das, Sayan Demura, Sean De Lorenzo, Laura Di Paolo, Agustin Donohoe, Paul Drozdov, Ilya Dunsworth, Andrew Eickbusch, Alec Elbag, Aviv Moshe Elzouka, Mahmoud Erickson, Catherine Ferreira, Vinicius S. Burgos, Leslie Flores Forati, Ebrahim Fowler, Austin G. Foxen, Brooks Ganjam, Suhas Gasca, Robert Genois, Élie Giang, William Gilboa, Dar Gosula, Raja Dau, Alejandro Grajales Graumann, Dietrich Greene, Alex Gross, Jonathan A. Habegger, Steve Hansen, Monica Harrigan, Matthew P. Harrington, Sean D. Heu, Paula Higgott, Oscar Hilton, Jeremy Huang, Hsin-Yuan Huff, Ashley Huggins, William Jeffrey, Evan Jiang, Zhang Jones, Cody Joshi, Chaitali Juhas, Pavol Kafri, Dvir Kang, Hui Karamlou, Amir H. Kechedzhi, Kostyantyn Khaire, Trupti Khattar, Tanuj Khezri, Mostafa Kim, Seon Klimov, Paul Kobrin, Bryce Korotkov, Alexander Kostritsa, Fedor Kreikebaum, John Mark Kurilovich, Vladislav Landhuis, David Lange-Dei, Tiano Langley, B. Lau, K.-M. Ledford, J. Lee, K. Lester, B. Le Guevel, L. Li, W. Lill, A.T. Livingston, W. Locharla, A. Lundahl, D. Lunt, A. Madhuk, S. Maloney, A. Mandrà, S. Martin, L. Martin, O. Maxfield, C. McClean, J. McEwen, M. Meeks, S. Megrant, A. Miao, K. Molavi, R. Molina, S. Montazeri, S. Movassagh, R. Neill, C. Newman, M. Nguyen, A. Nguyen, M. Ni, C.-H. Ottosson, K. Pizzuto, A. Potter, R. Pritchard, O. Quintana, C. Ramachandran, G. Reagor, M. Google Research Mountain ViewCA United States Department of Physics Princeton University PrincetonNJ United States Technical University of Munich TUM School of Natural Sciences Physics Department Garching85748 Germany Schellingstr. 4 München80799 Germany Department of Physics Cornell University IthacaNY United States Laboratory of Solid State and Atomic Physics Cornell University IthacaNY United States Department of Physics and Astronomy Purdue University West LafayetteIN47906 United States Department of Electrical and Computer Engineering University of Massachusetts AmherstMA United States Department of Physics University of Connecticut StorrsCT United States Department of Electrical and Computer Engineering University of California RiversideCA United States School of Physics and Astronomy University of Nottingham NottinghamNG7 2RD United Kingdom Centre for the Mathematics and Theoretical Physics of Quantum Non-Equilibrium Systems University of Nottingham NottinghamNG7 2RD United Kingdom

Lattice gauge theories (LGTs) [1–4] can be employed to understand a wide range of phenomena, from elementary particle scattering in high-energy physics to effective descriptions of many-body interactions in materials [5–7]. Studying dynamical properties of emergent phases can be challenging as it requires solving many-body problems that are generally beyond perturbative limits [8–10]. We investigate the dynamics of local excitations in a Z2 LGT using a two-dimensional lattice of superconducting qubits. We first construct a simple variational circuit which prepares low-energy states that have a large overlap with the ground state;then we create particles with local gates and simulate their quantum dynamics via a discretized time evolution. As the effective magnetic field is increased, our measurements show signatures of transitioning from deconfined to confined dynamics. For confined excitations, the magnetic field induces a tension in the string connecting them. Our method allows us to experimentally image string dynamics in a (2+1)D LGT from which we uncover two distinct regimes inside the confining phase: for weak confinement the string fluctuates strongly in the transverse direction, while for strong confinement transverse fluctuations are effectively frozen [11, 12]. In addition, we demonstrate a resonance condition at which dynamical string breaking is facilitated. Our LGT implementation on a quantum processor presents a novel set of techniques for investigating emergent particle and string dynamics. © 2024, CC BY.

关键词： Ground state

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Maximizing the Accuracy of Microcomb-Based Microwave Photonic Transversal Signal Processors

Maximizing the Accuracy of Microcomb-Based Microwave Photoni...

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Conference on Lasers and Electro-Optics (CLEO)

作者： Yang Sun Jiayang Wu Yang Li Guanghui Ren Mengxi Tan Xingyuan Xu Bill Corcoran Sai Tak Chu Brent E. Little Roberto Morandotti Arnan Mitchell David J. Moss Optical Sciences Centre Swinburne University of Technology Hawthorn Victoria Australia Integrated Photonics and Applications Centre School of Engineering RMIT University Melbourne Victoria Australia School of Electronic and Information Engineering Beihang University Beijing China State Key Laboratory of Information Photonics and Optical Communications Beijing University of Posts and Telecommunications Beijing China Dept. Electrical and Computer Systems Engineering Photonic Communications Laboratory Monash University Clayton VIC Australia Department of Physics City University of Hong Kong Hong Kong QXP Technology Inc. Xi'an China INRS - Énergie Matériaux et Télécommunications Varennes QC Canada

We experimentally implement microcomb-based microwave photonic transversal signal processors and test their accuracy for differentiation, integration, and Hilbert transform. A global picture quantifying the impact of ... 详细信息

ISBN: (纸本)9798350369311

关键词： Program processors Accuracy Masers Transforms Microwave photonics Electro-optical waveguides

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Feedback control in RF photonic transversal filter systems based on optical microcombs

Feedback control in RF photonic transversal filter systems b...

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Conference on Lasers and Electro-Optics (CLEO)

作者： Yang Li Jiayang Wu Yang Sun Guanghui Ren Mengxi Tan Xingyuan Xu Bill Corcoran Sai Tak Chu Brent E. Little Roberto Morandotti Arnan Mitchell David J. Moss Optical Sciences Centre Swinburne University of Technology Hawthorn Victoria Australia Integrated Photonics and Applications Centre School of Engineering RMIT University Melbourne Victoria Australia School of Electronic and Information Engineering Beihang University Beijing China State Key Laboratory of Information Photonics and Optical Communications Beijing University of Posts and Telecommunications Beijing China Dept. Electrical and Computer Systems Engineering Photonic Communications Laboratory Monash University Clayton VIC Australia Department of Physics City University of Hong Kong Hong Kong QXP Technology Inc. Xi'an China INRS -Énergie Matériaux et Télécommunications Varennes QC Canada

We propose and experimentally demonstrate four different feedback control methods employed in microcomb-based RF photonic transversal filter systems to enhance their accuracy and stability. Detailed characterizations ... 详细信息

ISBN: (纸本)9798350369311

关键词： Optical filters Integrated optics Radio frequency Optical feedback Laser feedback Laser stability Transversal filters Feedback control Nonlinear optics Photonics

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Reference-Plane Invariant Free Space Dielectric Material Characterization up to 330 GHz

Reference-Plane Invariant Free Space Dielectric Material Cha...

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URSI Atlantic Radio Science Conference (URSI AT-RASC)

作者： Salvador Moreno-Rodríguez Mario Pérez-Escribano Sergio Ortiz-Ruiz Antonio Alex-Amor Borja Plaza-Gallardo Francisco G. Ruiz Carlos Molero Department of Signal Theory Telematics and Communications Research Centre for Information and Communication Technologies (CITIC-UGR) University of Granada Granada Spain Telecommunication Research Institute (TELMA) Universidad de Málaga E.T.S. Ingeniería de Telecomunicación Málaga Spain Department of Electronics and Computer Science Pervasive Electronics Advanced Research Laboratory (PEARL) University of Granada Granada Spain Department of Electrical and Systems Engineering University of Pennsylvania Philadelphia Pennsylvania United States Radiofrequency Area National Institute for Aerospace Technology (INTA) Madrid Spain

ISBN: (数字)9789463968102

ISBN: (纸本)9798350360257

This paper describes the process followed to implement a system to characterize the complex permittivity of materials in the 10-330 GHz frequency band. Firstly, the method used and the system’s calibration process are shown, consisting of a double calibration TRL (Thru-Reflect-Line) and GRL (Gated-Reflect-Line). Subsequently, a smoothing technique is used to improve the accuracy of the results. Finally, a test is performed on quartz and glass fiber samples, showing that the results are quite reliable over the entire measured bandwidth.

关键词： Accuracy Smoothing methods Permittivity measurement Glass Bandwidth Position measurement Reflection

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Low-Velocity-Favored Transition Radiation

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Physical Review Letters 2023年第11期131卷 113002-113002页

作者： Jialin Chen Ruoxi Chen Fuyang Tay Zheng Gong Hao Hu Yi Yang Xinyan Zhang Chan Wang Ido Kaminer Hongsheng Chen Baile Zhang Xiao Lin Interdisciplinary Center for Quantum Information State Key Laboratory of Extreme Photonics and Instrumentation ZJU-Hangzhou Global Scientific and Technological Innovation Center College of Information Science & Electronic Engineering Zhejiang University Hangzhou 310027 China International Joint Innovation Center the Electromagnetics Academy at Zhejiang University Zhejiang University Haining 314400 China Department of Electrical and Computer Engineering Technion-Israel Institute of Technology Haifa 32000 Israel Department of Electrical and Computer Engineering Rice University Houston Texas 77005 USA Applied Physics Graduate Program Smalley-Curl Institute Rice University Houston Texas 77005 USA School of Electrical and Electronic Engineering Nanyang Technological University Singapore 639798 Singapore Department of Physics University of Hong Kong Hong Kong 999077 China Key Lab of Advanced Micro/Nano Electronic Devices & Smart Systems of Zhejiang Jinhua Institute of Zhejiang University Zhejiang University Jinhua 321099 China Shaoxing Institute of Zhejiang University Zhejiang University Shaoxing 312000 China Division of Physics and Applied Physics School of Physical and Mathematical Sciences Nanyang Technological University Singapore 637371 Singapore Centre for Disruptive Photonic Technologies Nanyang Technological University Singapore 637371 Singapore

When a charged particle penetrates through an optical interface, photon emissions emerge—a phenomenon known as transition radiation. Being paramount to fundamental physics, transition radiation has enabled many applications from high-energy particle identification to novel light sources. A rule of thumb in transition radiation is that the radiation intensity generally decreases with the decrease of particle velocity v; as a result, low-energy particles are not favored in practice. Here, we find that there exist situations where transition radiation from particles with extremely low velocities (e.g., v/c<10−3) exhibits comparable intensity as that from high-energy particles (e.g., v/c=0.999), where c is the light speed in free space. The comparable radiation intensity implies an extremely high photon extraction efficiency from low-energy particles, up to 8 orders of magnitude larger than that from high-energy particles. This exotic phenomenon of low-velocity-favored transition radiation originates from the interference of the excited Ferrell-Berreman modes in an ultrathin epsilon-near-zero slab. Our findings may provide a promising route toward the design of integrated light sources based on low-energy electrons and specialized detectors for beyond-standard-model particles.

关键词： Atom or molecule scattering from surfaces Atomic & molecular collisions Cherenkov radiation Crystal optics Electron beams & optics Light-matter interaction Optical sources & detectors Optical transient phenomena Plasmonics

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A Lightweight Flexible Semi-Cylindrical Valve for Seamless Integration in Soft Robots Based on the Giant Electrorheological Fluid

SSRN

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SSRN 2022年

作者： Huang, Tiantian Xu, Denan Zhang, Hang Bai, Ou Aravelli, Aparna Zhou, Xiaoxiao Han, Bin School of Mechanical Science and Engineering Huazhong University of Science and Technology Wuhan430070 China Human Cyber-Physical Systems Laboratory The Department of Electrical and Computer Engineering Florida International University Florida33174 United States Applied Research Center Florida International University Florida33174 United States Guangdong Intelligent Robotics Institute Dongguan523808 China

Complete compliance of soft robots is a trending research topic. One significant aspect is the control element. In the current work, a flexible electro-rheological (ER) valve development is chosen due to the advantage of its dynamic power density, convenient electronic control mode and no mechanical moving parts. These properties enable the ER valve to be miniaturized and easily integrated into a fluid-driven soft robot. However, the integration effect of the existing flexible ER valve configuration in soft robots is not ideal. In this study, a novel concentric semi-cylindrical flexible giant ER (GER) valve with a dual flowing direction is proposed for a soft robot to enable a larger deformation bending motion with multiple motion modes. The resulting valve has an overall volume of 50 mm 3 , a mass of 0.88 g, and a maximum controlling pressure of 84 kPa with a pressure change rate of 13.9, which is suitable for most soft robot applications. The pressure difference calculation method for the concentric semi-cylindrical GER valve is discussed. The effects of size, voltages, and flow rates on the valve’s static and dynamic performances, as well as the characteristics of the two pressure regulation modes, are investigated through simulations and experiments. The seamless integration and flexibility of the proposed valve are demonstrated by controlling a typical network actuator with six motion modes. Finally, a soft robot composed of two actuators is fabricated and realized the grasping of multiple everyday objects using different motion modes. © 2022, The Authors. All rights reserved.

关键词： Nanofluidics

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Phase-space function recovery for moving target imaging in SAR by convex optimization

arXiv

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arXiv 2021年

作者： Thammakhoune, Sean Yonel, Bariscan Mason, Eric Yazici, Birsen Eldar, Yonina C. Department of Electrical Computer and Systems Engineering Rensselaer Polytechnic Institute TroyNY12180 United States United States Naval Research Laboratory 4555 Overlook Ave SW WashingtonDC20375 United States Department of Mathematics and Computer Science Weizmann Institute of Science Rehovot7610001 Israel

In this paper, we present an approach for ground moving target imaging (GMTI) and velocity recovery using synthetic aperture radar. We formulate the GMTI problem as the recovery of a phase-space reflectivity (PSR) function which represents the strengths and velocities of the scatterers in a scene of interest. We show that the discretized PSR matrix can be decomposed into a rank-one, and a highly sparse component corresponding to the stationary and moving scatterers, respectively. We then recover the two distinct components by solving a constrained optimization problem that admits computationally efficient convex solvers within the proximal gradient descent and alternating direction method of multipliers frameworks. Using the structural properties of the PSR matrix, we alleviate the computationally expensive steps associated with rank-constraints, such as singular value thresholding. Our optimization-based approach has several advantages over state-of-the-art GMTI methods, including computational efficiency, applicability to dense target environments, and arbitrary imaging configurations. We present extensive simulations to assess the robustness of our approach to both additive noise and clutter, with increasing number of moving targets. We show that both solvers perform well in dense moving target environments, and low-signal-to-clutter ratios without the need for additional clutter suppression techniques. Copyright © 2021, The Authors. All rights reserved.

关键词： Computational efficiency

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Mechanical resonant sensing of spin texture dynamics in a two-dimensional antiferromagnet

arXiv

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arXiv 2025年

作者： Yousuf, S.M. Enamul Hoque Wang, Yunong Ramachandran, Shreyas Koptur-Palenchar, John Tarantini, Chiara Xiang, Li McGill, Stephen Smirnov, Dmitry Santos, Elton J.G. Feng, Philip X.-L. Zhang, Xiao-Xiao Department of Electrical & Computer Engineering University of Florida GainesvilleFL32611 United States Institute for Condensed Matter Physics and Complex Systems School of Physics and Astronomy The University of Edinburgh EdinburghEH9 3FD United Kingdom Department of Physics University of Florida GainesvilleFL32611 United States National High Magnetic Field Laboratory TallahasseeFL32312 United States Donostia-San Sebastian20018 Spain Higgs Centre for Theoretical Physics The University of Edinburgh EH9 3FD United Kingdom

The coupling between the spin degrees of freedom and macroscopic mechanical motions, including striction[1], shearing[2], and rotation[3-4], has attracted wide interest with applications in actuation, transduction, and information processing[5-7]. Experiments so far have established the mechanical responses to the long-range ordered[1, 5] or isolated single spin states[8]. However, it remains elusive whether mechanical motions can couple to a different type of magnetic structure, the non-collinear spin textures, which exhibit nanoscale spatial variations of spin (domain walls, skyrmions, etc.) and are promising candidates to realize high-speed computing devices[9-12]. Here, we report the detection of collective spin texture dynamics with nanoelectromechanical resonators made of two-dimensional antiferromagnetic (AFM) MnPS3 with 10-9 strain sensitivity. By examining radio frequency mechanical oscillations under magnetic fields, new magnetic transitions were identified with sharp dips in resonant frequency. They are attributed to the collective AFM domain wall motions as supported by the analytical modeling of magnetostriction and large-scale spin-dynamics simulations. Additionally, an abnormally large modulation in the mechanical nonlinearity at the transition field infers a fluid-like response due to the ultrafast domain motion. Our work establishes a strong coupling between spin texture and mechanical dynamics, laying the foundation for electromechanical manipulation of spin texture and developing quantum hybrid devices. © 2025, CC BY.

关键词： Degrees of freedom (mechanics)

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The Dynamics and Control of the Fractional Forms of Some Rational Chaotic Maps

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Journal of systems Science & Complexity 2020年第3期33卷 584-603页

作者： OUANNAS Adel KHENNAOUI Amina-Aicha BENDOUKHA Samir WANG Zhen PHAM Viet-Thanh Laboratory of Mathematics Informatics and Systems(LAMIS)University of Larbi TebessiTebessa 12002Algeria Department of Mathematics and Computer Sciences University of Larbi Ben M'hidiOum El BouaghiAlgeria Department of Electrical Engineering College of EngineeringYanbuTaibah UniversitySaudi Arabia Shaanxi Engineering Research Center of Controllable Neutron Source School of ScienceXijing UniversityXi'an 710123China Faculty of Electrical and Electronic Engineering Phenikaa Institute for Advanced Study(PIAS)Phenikaa UniversityYen NghiaHa Dong districtHanoi 100000Vietnam Phenikaa Research and Technology Institute(PRATI) A&A Green Phoenix Group167 Hoang NganHanoi 100000Vietnam

This paper proposes three fractional discrete chaotic systems based on the Rulkov,Chang,and Zeraoulia–Sprott rational *** dynamics of the proposed maps are investigated by means of phase plots and bifurcations *** stabilization schemes are proposed for each of the three maps and the convergence of the states is established by using the Lyapunov ***,a combination synchronization scheme is proposed whereby a combination of the fractional Rulkov and Chang maps is synchronized to the fractional Zeraoulia-Sprott *** results are used to confirm the findings of the paper.

关键词： Fractional discrete chaos fractional rational maps stabilization synchronization

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Performance evaluation of faults in a photovoltaic array based on V-I and V-P characteristic curve 12

Performance evaluation of faults in a photovoltaic array bas...

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12th International Conference on Measuring Technology and Mechatronics Automation, ICMTMA 2020

作者： Lodhi, Ehtisham Lina, Wang Pu, Yang Javed, M. Yaqoob Lodhi, Zeeshan Zhijie, Jiao Javed, Usman School of Automation Science and Electrical Engineering Beihang University Beijing100191 China State Key Laboratory for Management and Control of Complex Systems Institute of Automation Chinese Academy of Sciences Beijing 100190 China Department of Electrical and Computer Engineering COMSATS University Islamabad Lahore54000 Pakistan Department of Electrical and Computer Engineering COMSATS University Islamabad Abbottabad22060 Pakistan Guo China-US Photonics Lab Changchun Institute of Optics Fine Mechanics and Physics Chinese Academy of Sciences Changchun130033 China

ISBN: (纸本)9781728170817

The prediction and forecasting of faults occurring in photovoltaic (PV) system is one of the important aspect to escalate the reliability, output power generation, proficiency, lifetime and effectiveness of overall system. In this article, the behavior of PV array is studied under various faulty circumstances and new approach has offered for the better performance assessment of PV array. This approach is established on the analysis of peculiarities displayed by voltage power (V-P) and voltage-current (V-I) characteristics curves of PV array under different faulty conditions. The proposed technique can be used to identify and classify the five common faults in PV system. These progressive faults (includes open circuit, line-to-line, partial shading, degradation and bridging faults) have been occurred at the basic components of PV cell and at the connection point between PV modules. The characteristic curves under normal and faulty conditions have been compared by utilizing Matlab/Simulink environment. Hence, the suggested method can be utilized to determine the important fact about the health PV array. © 2020 IEEE.

关键词： Solar panels

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