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Laminar and transiently disordered dynamics of magnetic-skyrmion pipe flow

Physical Review B 2023年第14期108卷 144428-144428页

作者： Xichao Zhang Jing Xia Oleg A. Tretiakov Motohiko Ezawa Guoping Zhao Yan Zhou Xiaoxi Liu Masahito Mochizuki Department of Applied Physics Waseda University Okubo Shinjuku-ku Tokyo 169-8555 Japan Department of Electrical and Computer Engineering Shinshu University 4-17-1 Wakasato Nagano 380-8553 Japan School of Physics The University of New South Wales Sydney New South Wales 2052 Australia Department of Applied Physics The University of Tokyo 7-3-1 Hongo Tokyo 113-8656 Japan College of Physics and Electronic Engineering Sichuan Normal University Chengdu 610068 China School of Science and Engineering The Chinese University of Hong Kong Shenzhen Guangdong 518172 China

The world is full of fluids that flow. The fluid nature of flowing skyrmionic quasiparticles is of fundamental physical interest and plays an essential role in the transport of many skyrmions. Here, we report the laminar and transiently disordered dynamic behaviors of many magnetic skyrmions flowing in a pipe channel. The skyrmion flow driven by a uniform current may show a lattice structural transition. The skyrmion flow driven by a nonuniform current shows a dynamically varying lattice structure. A large uniform current could result in the compression of skyrmions toward the channel edge, leading to the transition of the skyrmion pipe flow into an open-channel flow with a free surface. Namely, the width of the skyrmion flow could be adjusted by the driving current. Skyrmions on the free surface may form a single shear layer adjacent to the main skyrmion flow. In addition, although we focus on the skyrmion flow dynamics in a clean pipe channel without any pinning or defect effect, we also show that variation of the magnetic anisotropy in the pipe channel could lead to more complicated skyrmion flow dynamics and path lines. Our results reveal the fluid nature of skyrmionic quasiparticles, which may motivate future research on the complex flow physics of magnetic textures.

关键词： Channel flow Dynamical phase transitions Laminar flows Magnetism Skyrmions Spintronics Transport phenomena Turbulence Interfaces Nanostructures Micromagnetic modeling

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Routing Single Photons from a Trapped Ion Using a Photonic Integrated Circuit

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Physical Review applied 2023年第3期19卷 034001-034001页

作者： Uday Saha James D. Siverns John Hannegan Mihika Prabhu Qudsia Quraishi Dirk Englund Edo Waks Department of Electrical and Computer Engineering University of Maryland College Park Maryland 20742 USA Institute for Research in Electronics and Applied Physics (IREAP) University of Maryland College Park Maryland 20742 USA Department of Physics University of Maryland College Park Maryland 20742 USA Department of Electrical Engineering and Computer Science Massachusetts Institute of Technology Cambridge Massachusetts 02139 USA United States Army Research Laboratory Adelphi Maryland 20783 USA Joint Quantum Institute (JQI) University of Maryland College Park Maryland 20742 USA

Trapped ions are promising candidates for nodes of a scalable quantum network due to their long-lived qubit coherence times and high-fidelity single- and two-qubit gates. Future quantum networks based on trapped ions will require a scalable way to route photons between different nodes. Photonic integrated circuits from fabrication foundries provide a compact solution to this problem. However, these circuits typically operate at telecommunication wavelengths that are incompatible with the strong dipole emissions of trapped ions. In this work, we demonstrate the routing of single photons from a trapped ion using a photonic integrated circuit. We employ quantum frequency conversion to match the emission of the ion to the operating wavelength of a foundry-fabricated silicon nitride photonic integrated circuit, achieving a total transmission of 31.0% ± 0.9% through the device. Using programmable phase shifters, we switch the single photons between the output channels of the circuit and demonstrate a 50:50 beam splitting condition. These results constitute an important step towards programmable routing and entanglement distribution in large-scale quantum networks and distributed quantum computers.

关键词： Integrated optics Optical quantum information processing Quantum communication Quantum information with trapped ions Quantum interconnects Quantum networks Trapped ions

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Light-induced tunable optical properties of 1T-TaS2 at different temperatures

Light-induced tunable optical properties of 1T-TaS2 at diffe...

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Conference on Lasers and Electro-Optics (CLEO)

作者： Weijian Li Gururaj V. Naik Applied Physics Graduate Program Smalley-Curl Institute Rice University Houston TX USA Electrical & Computer Engineering Rice University Houston TX USA

The c-axis permittivity of 1T-TaS 2 – a quasi-2D charge-density-wave material – changes upon illumination due to light-induced reorganization of CDW stacking. Here we probe the mechanism of this reorganization and ... 详细信息

ISBN: (数字)9781957171050

ISBN: (纸本)9781665466660

关键词： Laser theory Temperature Stacking Lighting Lasers and electrooptics Probes Permittivity

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Deep-Strong Coupling between Cavity Photons and Terahertz TO Phonons in PbTe

Deep-Strong Coupling between Cavity Photons and Terahertz TO...

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2023 Conference on Lasers and Electro-Optics, CLEO 2023

作者： Baydin, Andrey Manjappa, Manukumara Mishra, Sobhan Subhra Xu, Hongjing Tay, Fuyang Kim, Dasom Hernandez, Felix G.G. Rappl, Paulo H.O. Abramof, Eduardo Singh, Ranjan Kono, Junichiro Department of Electrical and Computer Engineering Rice University HoustonTX77005 United States Smalley-Curl Institute Rice University HoustonTX77005 United States Instrumentation and Applied Physics Department Indian Institute of Science Bangalore560012 India Center for Disruptive Photonic Technologies The Photonics Institute Nanyang Technological University 639798 Singapore Department of Physics and Astronomy Rice University HoustonTX77005 United States Applied Physics Graduate Program Smalley-Curl Institute Rice University HoustonTX77005 United States Instituto de Física Universidade de Sao Paulo SP Sao Paulo05508-090 Brazil Laboratorio Associado de Sensores e Materiais Instituto Nacional de Pesquisas Espaciais SP Sao Jose dos Campos12201-970 Brazil Division of Physics and Applied Physics School of Physical and Mathematical Sciences Nanyang Technological University 637371 Singapore Department of Material Science and NanoEngineering Rice University HoustonTX77005 United States

We have investigated the resonant coupling of photons with TO phonons in lead telluride in small-mode-volume terahertz cavities, observing a giant vacuum Rabi splitting on the order of the bare cavity-phonon frequency... 详细信息

ISBN: (纸本)9781957171258

关键词： Photons

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TiO2-based Flexible Integrated Photonics for High-sensitivity Temperature Sensing

TiO2-based Flexible Integrated Photonics for High-sensitivit...

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Conference on Lasers and Electro-Optics (CLEO)

作者： Xuan Zhao Bo Fan Ashok Veeraraghavan Jacob Robinson Applied Physics Graduate Program Smalley-Curl Institute Rice University Houston TX USA Electrical & Computer Engineering Rice University Houston TX USA

We report a flexible temperature sensor based on TiO 2 photonics that shows double the sensitivity compared to silicon photonics. This high sensitivity and biocompatibility pave the way towards point-of-care temperat... 详细信息

ISBN: (数字)9781957171050

ISBN: (纸本)9781665466660

关键词： Temperature sensors Sensitivity Point of care Silicon photonics Sensors Titanium dioxide Electrooptical waveguides

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On "Inconsistencies of metalens performance and comparison with conventional diffractive optics"

arXiv

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arXiv 2024年

作者： Arbabi, Amir Faraon, Andrei Department of Electrical and Computer Engineering University of Massachusetts Amherst AmherstMA United States T. J. Watson Laboratory of Applied Physics Kavli Nanoscience Institute California Institute of Technology PasadenaCA United States

It was recently claimed1 that reported focusing efficiency values of high numerical aperture metalenses are inconsistent with a theoretical bound, and their measurement results are incorrectly interpreted. We review t... 详细信息

关键词： Diffractive optics

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Compact and Thermal-Noise-Limited Optical Reference Cavity Operated in Air

Compact and Thermal-Noise-Limited Optical Reference Cavity O...

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Conference on Lasers and Electro-Optics (CLEO)

作者： Yifan Liu Dahyeon Lee Charles A. McLemore Megan Kelleher Takuma Nakamura Naijun Jin Susan Schima Peter Rakich Scott A. Diddams Franklyn Quinlan Department of Physics University of Colorado Boulder Boulder CO USA Time and Frequency Division National Institute of Standards and Technology Boulder CO USA Department of Applied Physics Yale University New Haven CT USA Electrical Computer and Energy Engineering University of Colorado Boulder Boulder CO USA

We present a vacuum-gap, compact Fabry-Pérot ultrastable optical reference cavity that operates without a vacuum enclosure. A laser stabilized to the cavity exhibits low, thermal noise-limited phase noise and $5... 详细信息

ISBN: (纸本)9798350369311

关键词： Phase noise Laser noise Lasers and electrooptics Laser stability Thermal noise Optical noise Thermal stability Electro-optical waveguides

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High-resolution and High-Contrast Imaging of Defects in a Crystal

High-resolution and High-Contrast Imaging of Defects in a Cr...

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CLEO: Science and Innovations, S and I 2022

作者： Moon, Jong Sung Lee, Haneul Lee, Jin Hee Jeon, Woong Bae Lee, Dowon Lee, Junghyun Paik, Seoyoung Han, Sang-Wook Reuter, Rolf Denisenko, Andrej Wrachtrup, Jörg Lee, Sang-Yun Kim, Je-Hyung Center for Quantum Information Korea Institute of Science and Technology Seoul02792 Korea Republic of Department of Electrical and Computer Engineering Institute for Research in Electronics and Applied Physics University of Maryland College ParkMD20742 United States University of Stuttgart Stuttgart70569 Germany Department of Physics and Photon Science Gwangju Institute of Science and Technology Gwangju61005 Korea Republic of

ISBN: (纸本)9781557528209

Optically active color centers in crystals provide important building blocks for quantum applications. However, conventional confocal fluorescence microscopy of high-refractive-index crystals suffers from limited photon collection efficiency and spatial resolution. Here, we demonstrate high-resolution, high-contrast imaging of defects in diamonds using microsphere-assisted confocal microscopy. A microsphere provides an excellent optical interface for point defects with a magnified virtual image that increases the spatial resolution up to λ/5, as well as the optical signal-to-noise ratio by four times. © Optica Publishing Group 2022, © 2022 The Author(s)

关键词： Microspheres

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General characterization of qubit-preserving impairments on two-qubit Bell nonlocality

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Physical Review A 2023年第2期107卷 022225-022225页

作者： Richard A. Brewster Gerald Baumgartner Yanne K. Chembo University of Maryland A. James Clark School of Engineering Department of Electrical and Computer Engineering & Institute for Research in Electronics and Applied Physics (IREAP) 8279 Paint Branch Dr College Park Maryland 20742 USA Laboratory for Telecommunication Sciences 8080 Greenmead Drive College Park Maryland 20740 USA

A general technique for experimentally characterizing the effect of qubit-preserving impairments on the Clauser-Horne-Shimony-Holt parameter is introduced. This technique is independent of the underlying qubit encoding and is theoretically demonstrated for specific example impairments in polarization-encoded quantum-optical qubits. Included in this analysis is how spectrotemporal impairments can be incorporated into this technique.

关键词： Quantum communication Quantum entanglement Quantum optics

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Multi-Instance Task in Swarm Robotics: Sorting Groups of Robots or Objects into Clusters with Minimalist Controllers

Multi-Instance Task in Swarm Robotics: Sorting Groups of Rob...

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IEEE/RSJ International Conference on Intelligent Robots and Systems (IROS)

作者： Adilson Krischanski Yuri K. Lopes Andre B. Leal Ricardo F. Martins Roberto S.U. Rosso Department of Computer Science Santa Catarina State University (UDESC) Joinville Brazil Graduate Program in Applied Computing (PPGCAP) UDESC Brazil Department of Electrical Engineering Santa Catarina State University (UDESC) Joinville Brazil

Relying only on behaviors that emerge from simple responsive controllers; swarms of robots have been shown capable of autonomously aggregate themselves or objects into clusters without any form of communication. We push these controllers to the limit, requiring robots to sort themselves or objects into different clusters. Based on a responsive controller that maps the current reading of a line-of-sight sensor to a pair of speeds for the robots' differential wheels, we demonstrate how multiple tasks instances can be accomplished by a robotic swarm. Using the dividing rectangles approach and physics simulation, a training step optimizes the parameters of the controller guided by a fitness function. We conducted a series of systematic trials in physics-based simulation and evaluate the performance in terms of dispersion and the ratio of clustered robots/objects. Across 20 trials where 30 robots cluster themselves into 3 groups, an average of 99.83% of them were correctly clustered into their group after 300 s. Across 50 trials where 15 robots cluster 30 objects into 3 groups, an average of 61.20%, 82.87%, and 97.73% of objects were correctly clustered into their group after 600 s, 900 s, and 1800 s, respectively. The object cluster behavior scales well while the aggregation does not, the latter due to the requirement of control tuning based on the number of robots.

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