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arXiv 2022年

作者： Cirigliano, V. Davoudi, Z. Engel, J. Furnstahl, R.J. Hagen, G. Heinz, U. Hergert, H. Horoi, M. Johnson, C.W. Lovato, A. Mereghetti, E. Nazarewicz, W. Nicholson, A. Papenbrock, T. Pastore, S. Plumlee, M. Phillips, Daniel R. Shanahan, P.E. Stroberg, S.R. Viens, F. Walker-Loud, A. Wendt, K.A. Wild, S.M. Institute for Nuclear Theory University of Washington SeattleWA98195 United States Department of Physics Maryland Center for Fundamental Physics University of Maryland College ParkMD20742 United States Department of Physics University of North Carolina Chapel HillNC27514 United States Department of Physics Ohio State University ColumbusOH43210 United States Physics Division Oak Ridge National Laboratory Oak RidgeTN37831 United States Department of Physics and Astronomy University of Tennessee KnoxvilleTN37996 United States Frib Laboratory Department of Physics and Astronomy Michigan State University East LansingMI48824 United States Department of Physics Central Michigan University Mount PleasantMI48859 United States Department of Physics San Diego State University San DiegoCA92182 United States Physics Division Argonne National Laboratory LemontIL60439 United States Computational Physics Division Argonne National Laboratory ArgonneIL60439 United States INFN-TIFPA Trento Institute of Fundamental Physics and Applications Trento38123 Italy Theory Division Los Alamos National Laboratory Los AlamosNM87544 United States Nuclear Science Division Lawrence Berkeley National Laboratory BerkeleyCA94720 United States Department of Physics McDonnell Center for the Space Sciences Washington University in Saint Louis Saint LouisMO63130 United States Industrial Engineering and Management Sciences Northwestern University EvanstonIL60208 United States Naise Northwestern University EvanstonIL60208 United States Department of Physics and Astronomy Institute of Nuclear and Particle Physics Ohio University AthensOH45701 United States Center for Theoretical Physics Massachusetts Institute of Technology CambridgeMA02139 United States Department of Statistics and Probability Michigan State University East LansingMI48824 United States Nuclear and Chemical Sciences Division Lawrence Livermore National Laboratory LivermoreCA94550 Unit

This white paper is an outgrowth of a National science Foundation (NSF) Project Scoping Workshop, the purpose of which was to assess the current status of calculations for the nuclear matrix elements governing neutrinoless doublebeta decay and determine if more work on them is required. The recent effort to define the United States' role in ton-scale experiments, together with the conclusion in 2021 of the Department of Energy (DOE) Topical Collaboration on neutrinoless double-beta decay, made such an exercise extremely timely. The main conclusions of the workshop can be summarized as follows: • Neutrinoless double-beta decay of nuclei is an important window into the physics of neutrinos. It could be the first lepton-number violating process ever observed. As such, it would provide key insights into physics beyond the Standard Model-in particular how the matter-anti-matter asymmetry of the universe arose. • Much progress on the theory of neutrinoless double-beta decay of nuclei has been made over the last five years. An end-to-end set of effective field theories (EFTs) that shows how to evolve the physics of the decay from the scale at which lepton number is violated (possibly much larger than TeV) down to the scales relevant for nuclei has been developed. Lattice quantum chromodynamics (LQCD) calculations of the process in the two-nucleon (NN) system are being set up, and the first ab initio many-body calculations of neutrinoless double-beta decay matrix elements M0νhave been carried out. • Much remains to be done before theory can successfully complement the large experimental effort to observe neutrinoless double-beta decay and measure its rate. Both the accuracy and precision of LQCD and ab initio nuclear many-body calculations need to be improved if crisp statements about experimental observation or non-observation are to be made. The uncertainty in nuclear many-body calculations remains largely unquantified, making it difficult to interpret the significant dif

关键词： Calculations

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The ENUF method-ewald summation based on non-uniform fast fourier transform: Implementation, parallelization, and application

arXiv

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arXiv 2020年

作者： Yang, Sheng-Chun Li, Bin Zhu, You-Liang Laaksonen, Aatto Wang, Yong-Lei School of Computer Science Northeast Electric Power University Jilin132012 China School of Chemical Engineering and Technology Sun Yat-sen University Zhuhai519082 China State Key Laboratory of Polymer Physics and Chemistry Changchun Institute of Applied Chemistry Chinese Academy of Sciences Changchun130022 China Department of Materials and Environmental Chemistry Arrhenius Laboratory Stockholm University StockholmSE-10691 Sweden State Key Laboratory of Materials-Oriented and Chemical Engineering Nanjing Tech University Nanjing210009 China Centre of Advanced Research in Bionanoconjugates and Biopolymers Petru Poni Institute of Macromolecular Chemistry Aleea Grigore Ghica-Voda 41A Iasi700487 Romania Department of Engineering Sciences and Mathematics Division of Energy Science Lulea University of Technology LuleaSE-97187 Sweden

computer simulations of model systems are widely used to explore striking phenomena in promising applications spanning from physics, chemistry, biology, to materials science and engineering. The long range electrostatic interactions between charged particles constitute a prominent factor in determining structures and states of model systems. How to effciently calculate electrostatic interactions in model systems subjected to partial or full periodic boundary conditions has been a grand challenging task. In the past decades, a large variety of computational schemes have been proposed, among which the Ewald summation method is the most reliable route to accurately deal with electrostatic interactions in model systems. In addition, extensive effort has been done to improve computational effciency of the Ewald summation based methods. Representative examples are approaches based on cutoffs, reaction fields, multi-poles, multi-grids, and particle-mesh schemes. We sketched an ENUF method, an abbreviation for the Ewald summation method based on Non-Uniform fast Fourier transform technique, and have implemented this method in particlebased simulation packages to calculate electrostatic energies and forces at microand mesoscopic levels. Extensive computational studies of conformational properties of polyelectrolytes, dendrimer-membrane complexes, and ionic uids demonstrated that the ENUF method and its derivatives conserve both energy and momentum to oating point accuracy, and exhibit a computational complexity of O(N logN) with optimal physical parameters. These ENUF based methods are attractive alternatives in molecular simulations where high accuracy and effciency of simulation methods are needed to accelerate calculations of electrostatic interactions at extended spatiotemporal scales. Copyright © 2020, The Authors. All rights reserved.

关键词： Electrostatics

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A Mixed-Signal Framework for Modelling Fourier-Domain Optical Coherence Tomography

A Mixed-Signal Framework for Modelling Fourier-Domain Optica...

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Asia Communications and Photonics Conference and Exhibition (ACP)

作者： Yuye Ling Mengyuan Wang Yu Gan Xinwen Yao Leopold Schmetterer Chuanqing Zhou Yikai Su John Hopcroft Center for Computer Science Shanghai Jiao Tong University Shanghai China University of Alabama AL USA Singapore Eye Research Institute Singapore National Eye Centre Singapore School of Chemical and Biomedical Engineering Nanyang Technological University Singapore School of Biomedical Engineering Shanghai Jiao Tong University Shanghai China State Key Lab of Advanced Optical Communication Systems and Networks Shanghai Jiao Tong University Shanghai China

We investigate the signal digitization procedure in FD-OCT and propose a novel mixed-signal framework to model its image formation. It turns out FD-OCT is a shift-variant system, if conventional IDFT is used to recons... 详细信息

ISBN: (数字)9781943580828

ISBN: (纸本)9781728176567

关键词： Optical coherence tomography Two dimensional displays Asia Optical fiber communication Image reconstruction Photonics

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Twist angle dependent interlayer exciton lifetimes in van der waals heterostructures

arXiv

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arXiv 2020年

作者： Choi, Junho Florian, Matthias Steinhoff, Alexander Erben, Daniel Tran, Kha Sun, Liuyang Quan, Jiamin Claassen, Robert Majumder, Somak Hollingsworth, Jennifer A. Taniguchi, Takashi Watanabe, Kenji Ueno, Keiji Singh, Akshay Moody, Galan Jahnke, Frank Li, Xiaoqin Department of Physics and Center for Complex Quantum Systems University of Texas at Austin AustinTX78712 United States Institute for Theoretical Physics University of Bremen Bremen28334 Germany Materials Physics & Applications Division Center for Integrated Nanotechnologies Los Alamos National Laboratory Los AlamosNM87545 United States International Center for Materials Nanoarchitectonics National Institute for Materials Science 1-1 Namiki TsukubaIbaraki305-0044 Japan Research Center for Functional Materials National Institute for Materials Science 1-1 Namiki TsukubaIbaraki305-0044 Japan Department of Chemistry Graduate School of Science and Engineering Saitama University Saitama338-8570 Japan Department of Physics Indian Institute of Science BengaluruKarnataka560012 India Department of Electrical and Computer Engineering University of California Santa Barbara Santa BarbaraCA93106 United States

In van der Waals (vdW) heterostructures formed by stacking two monolayers of transition metal dichalcogenides, multiple exciton resonances with highly tunable properties are formed and subject to both vertical and lateral confinement. We investigate how a unique control knob, the twist angle between the two monolayers, can be used to control the exciton dynamics. We observe that the interlayer exciton lifetimes in MoSe2/WSe2 twisted bilayers (TBLs) change by one order of magnitude when the twist angle is varied from 1◦ to 3.5◦. Using a low-energy continuum model, we theoretically separate two leading mechanisms that influence interlayer exciton radiative lifetimes. The shift to indirect transitions in the momentum space with an increasing twist angle and the energy modulation from the moiré potential both have a significant impact on interlayer exciton lifetimes. We further predict distinct temperature dependence of interlayer exciton lifetimes in TBLs with different twist angles, which is partially validated by experiments. While many recent studies have highlighted how the twist angle in a vdW TBL can be used to engineer the ground states and quantum phases due to many-body interaction, our studies explore its role in controlling the dynamics of optically excited states, thus, expanding the conceptual applications of "twistronics". Copyright © 2020, The Authors. All rights reserved.

关键词： Van der Waals forces

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Illinois Express Quantum Network (IEQNET): Metropolitan-scale experimental quantum networking over deployed optical fiber

arXiv

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arXiv 2021年

作者： Chung, Joaquin Kanter, Gregory Lauk, Nikolai Valivarthi, Raju Wu, Wenji Ceballos, Russell R. Peña, Cristián Sinclair, Neil Thomas, Jordan Xie, Si Kettimuthu, Rajkumar Kumar, Prem Spentzouris, Panagiotis Spiropulu, Maria Data Science and Learning Division Argonne National Laboratory 9700 S Cass Ave. LemontIL60439 United States University of Chicago Consortium for Advanced Science and Engineering 924 E 57th St ChicagoIL60637 United States NuCrypt LLC 1840 Oak Ave EvanstonIL60201 United States Center for Photonic Communication and Computing Department of Electrical and Computer Engineering McCormick School of Engineering and Applied Science Northwestern University 2145 Sheridan Road EvanstonIL60208-3118 United States Division of Physics Mathematics and Astronomy California Institute of Technology 1200 E. California Blvd. PasadenaCA91125 United States California Institute of Technology 1200 E. California Blvd. PasadenaCA91125 United States Fermi National Accelerator Laboratory Kirk Rd and Pine St BataviaIL60510 United States Department of Chemistry Physics and Engineering Studies Chicago State University 9501 S. King Dr. ChicagoIL60628 United States Pittsburgh Quantum Institute B4 Thaw Hall 4061 O'Hara Street PittsburghPA15260 United States John A. Paulson School of Engineering and Applied Sciences Harvard University 29 Oxford St. CambridgeMA02138 United States 2205 Tech Drive Suite 1-160 EvanstonIL60208 United States Department of Physics and Astronomy Northwestern University 2145 Sheridan Road EvanstonIL60208-3112 United States

The Illinois Express Quantum Network (IEQNET) is a program to realize metro-scale quantum networking over deployed optical fiber using currently available technology. IEQNET consists of multiple sites that are geographically dispersed in the Chicago metropolitan area. Each site has one or more quantum nodes (Q-nodes) representing the communication parties in a quantum network. Q-nodes generate or measure quantum signals such as entangled photons and communicate the results via standard, classical, means. The entangled photons in IEQNET nodes are generated at multiple wavelengths, and are selectively distributed to the desired users via optical switches. Here we describe the network architecture of IEQNET, including the Internet-inspired layered hierarchy that leverages software-defined-networking (SDN) technology to perform traditional wavelength routing and assignment between the Q-nodes. Specifically, SDN decouples the control and data planes, with the control plane being entirely classical. Issues associated with synchronization, calibration, network monitoring, and scheduling will be discussed. An important goal of IEQNET is demonstrating the extent to which the control plane can coexist with the data plane using the same fiber lines. This goal is furthered by the use of tunable narrow-band optical filtering at the receivers and, at least in some cases, a wide wavelength separation between the quantum and classical channels. We envision IEQNET to aid in developing robust and practical quantum networks by demonstrating metro-scale quantum communication tasks such as entanglement distribution and quantum-state teleportation. © 2021, CC BY.

关键词： Optical fibers

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Application of time-fractional order bloch equation in magnetic resonance fingerprinting

arXiv

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arXiv 2019年

作者： Wang, Haifeng Zou, Lixian Ye, Huihui Su, Shi Chang, Yuchou Liu, Xin Liang, Dong Paul C. Lauterbur Research Center for Biomedical Imaging Shenzhen Institutes of Advanced Technology Chinese Academy of Sciences Shenzhen College of Advanced Technology University of Chinese Academy of Sciences State Key Laboratory of Modern Optical Instrumentation College of Optical Science and Engineering Zhejiang University Department of of Computer Science and Engineering Technology University of Houston-Downtown

Magnetic resonance fingerprinting (MRF) is one novel fast quantitative imaging framework for simultaneous quantification of multiple parameters with pseudo - randomized acquisition patterns. The accuracy of the resulting multi-parameters is very important for clinical applications. In this paper, we derived signal evolutions from the anomalous relaxation using a fractional calculus. More specifically, we utilized time-fractional order extension of the Bloch equations to generate dictionary to provide more complex system descriptions for MRF applications. The representative results of phantom experiments demonstrated the good accuracy performance when applying the time-fractional order Bloch equations to generate dictionary entries in the MRF framework. The utility of the proposed method is also validated by in-vivo study. Copyright © 2019, The Authors. All rights reserved.

关键词： Magnetic resonance

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Experimental passive state preparation for continuous variable quantum communications

arXiv

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arXiv 2020年

作者： Qi, Bing Gunther, Hyrum Evans, Philip G. Williams, Brian P. Camacho, Ryan M. Peters, Nicholas A. Quantum Information Science Group Computational Sciences and Engineering Division Oak Ridge National Laboratory Oak RidgeTN37831 United States Department of Physics and Astronomy University of Tennessee KnoxvilleTN37996 United States Department of Electrical and Computer Engineering Brigham Young University ProvoUT84602 United States Center for Interdisciplinary Research and Graduate Education University of Tennessee KnoxvilleTN37996 United States

In the Gaussian-modulated coherent state quantum key distribution (QKD) protocol, the sender first generates Gaussian distributed random numbers and then encodes them on weak laser pulses actively by performing amplitude and phase modulations. Recently, an equivalent passive QKD scheme was proposed by exploring the intrinsic field fluctuations of a thermal source [B. Qi, P. G. Evans, and W. P. Grice, Phys. Rev. A 97, 012317 (2018)]. This passive QKD scheme is especially appealing for chip-scale implementation since no active modulations are required. In this paper, we conduct an experimental study of the passively encoded QKD scheme using an off-the-shelf amplified spontaneous emission source operated in continuous-wave mode. Our results show that the excess noise introduced by the passive state preparation scheme can be effectively suppressed by applying optical attenuation and secure key could be generated over metro-area distances. Copyright © 2020, The Authors. All rights reserved.

关键词： Quantum cryptography

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Tunable magnetic ordering through cation selection in entropic spinel oxides

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Physical Review Materials 2019年第10期3卷 104416-104416页

作者： Brianna Musicó Quinton Wright T. Zac Ward Alexander Grutter Elke Arenholz Dustin Gilbert David Mandrus Veerle Keppens Joint Institute for Advanced Materials Department of Materials Science and Engineering University of Tennessee-Knoxville Tennessee 37996-4545 USA Materials Science and Technology Division Oak Ridge National Laboratory Oak Ridge Tennessee 37831 USA NIST Center for Neutron Research National Institute of Standards and Technology Gaithersburg Maryland 20899-6102 USA Advanced Light Source Lawrence Berkeley National Laboratory Berkeley California 94720 USA

Twelve multicomponent spinels, comprised of (Mg, Cr, Mn, Co, Fe, Ni, Cu, and/or Zn)(Cr,Fe,orAl)2O4, were prepared using solid state synthesis methods, resulting in nine homogenous, single phase samples with a Fm−3m structure, and three samples with multiple phases. Using dc magnetometry in conjunction with x-ray diffraction, scanning electron microscopy with energy dispersive x-ray spectroscopy, and x-ray absorption spectroscopy, the effects of multicomponent material design on the structural, magnetic, and chemical properties are explored. The ferritic spinel high-entropy oxide (HEO) samples show high-temperature ferrimagnetic transitions and both ferritic and chromium-based HEO spinel samples show evidence of low-temperature antiferromagnetic ordering. Blocking temperatures are evident in some samples and magnetic transition temperatures are reported. Constituent valence states and temperature dependent valence is described for the example case of (Mg0.2Fe0.2Co0.2Ni0.2Cu0.2)Cr2O4, including the unexpected presence of Cr4+, indicating a 2–4 type spinel configuration. Valence trends for two ferritic HEO spinels are also discussed. Some of these compositions are synthesized for the first time and this work provides an investigation into the magnetic properties of the novel class of cubic spinel multicomponent oxides showing interesting behavior that warrants further investigation.

关键词： Magnetic phase transitions Magnetism Polycrystalline materials Spinels Magnetization measurements X-ray absorption spectroscopy X-ray magnetic linear dichroism

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Bayesian Inference analysis of jet quenching using inclusive jet and hadron suppression measurements

arXiv

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arXiv 2024年

作者： Ehlers, R. Chen, Y. Mulligan, J. Ji, Y. Kumar, A. Mak, S. Jacobs, P.M. Majumder, A. Angerami, A. Arora, R. Bass, S.A. Datta, R. Du, L. Elfner, H. Fries, R.J. Gale, C. He, Y. Jacak, B.V. Jeon, S. Jonas, F. Kasper, L. Kordell II, M. Kunnawalkam-Elayavalli, R. Latessa, J. Lee, Y.-J. Lemmon, R. Luzum, M. Mankolli, A. Martin, C. Mehryar, H. Mengel, T. Nattrass, C. Norman, J. Parker, C. Paquet, J.-F. Putschke, J.H. Roch, H. Roland, G. Schenke, B. Schwiebert, L. Sengupta, A. Shen, C. Singh, M. Sirimanna, C. Soeder, D. Soltz, R.A. Soudi, I. Tachibana, Y. Velkovska, J. Vujanovic, G. Wang, X.-N. Wu, X. Zhao, W. Department of Physics University of California BerkeleyCA94270 United States Nuclear Science Division Lawrence Berkeley National Laboratory BerkeleyCA94270 United States Laboratory for Nuclear Science Massachusetts Institute of Technology CambridgeMA02139 United States Department of Physics Massachusetts Institute of Technology CambridgeMA02139 United States Department of Physics and Astronomy Vanderbilt University NashvilleTN37235 United States Department of Statistical Science Duke University DurhamNC27708 United States Department of Physics University of Regina ReginaSKS4S 0A2 Canada Department of Physics McGill University MontréalQCH3A 2T8 Canada Department of Physics and Astronomy Wayne State University DetroitMI48201 United States Lawrence Livermore National Laboratory LivermoreCA94550 United States Department of Computer Science Wayne State University DetroitMI48202 United States Department of Physics Duke University DurhamNC27708 United States GSI Helmholtzzentrum für Schwerionenforschung Darmstadt64291 Germany Institute for Theoretical Physics Goethe University Frankfurt am Main60438 Germany Frankfurt Institute for Advanced Studies Frankfurt am Main60438 Germany Cyclotron Institute Texas A&M University College StationTX77843 United States Department of Physics and Astronomy Texas A&M University College StationTX77843 United States Guangdong Provincial Key Laboratory of Nuclear Science Institute of Quantum Matter South China Normal University Guangzhou510006 China Guangdong-Hong Kong Joint Laboratory of Quantum Matter Southern Nuclear Science Computing Center South China Normal University Guangzhou510006 China Daresbury Laboratory Warrington Cheshire DaresburyWA44AD United Kingdom Instituto de Fisica Universidade de São Paulo C.P. 66318 SP São Paulo05315-970 Brazil Department of Physics and Astronomy University of Tennessee KnoxvilleTN37996 United States Oliver Lodge Laboratory University of Liverpool

The Jetscape Collaboration reports a new determination of the jet transport parameter q in the Quark-Gluon Plasma (QGP) using Bayesian Inference, incorporating all available inclusive hadron and jet yield suppression data measured in heavy-ion collisions at RHIC and the LHC. This multiobservable analysis extends the previously published Jetscape Bayesian Inference determination of q, which was based solely on a selection of inclusive hadron suppression data. Jetscape is a modular framework incorporating detailed dynamical models of QGP formation and evolution, and jet propagation and interaction in the QGP. Virtuality-dependent partonic energy loss in the QGP is modeled as a thermalized weakly-coupled plasma, with parameters determined from Bayesian calibration using soft-sector observables. This Bayesian calibration of q utilizes Active Learning, a machine-learning approach, for efficient exploitation of computing resources. The experimental data included in this analysis span a broad range in collision energy and centrality, and in transverse momentum. In order to explore the systematic dependence of the extracted parameter posterior distributions, several different calibrations are reported, based on combined jet and hadron data;on jet or hadron data separately;and on restricted kinematic or centrality ranges of the jet and hadron data. Tension is observed in comparison of these variations, providing new insights into the physics of jet transport in the QGP and its theoretical formulation. © 2024, CC BY.

关键词： Heavy ions

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Adaptive unimodal cost volume filtering for deep stereo matching

arXiv

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arXiv 2019年

作者： Zhang, Youmin Chen, Yimin Bai, Xiao Yu, Suihanjin Yu, Kun Li, Zhiwei Yang, Kuiyuan State Key Laboratory of Software Development Environment School of Computer Science and Engineering Beijing Advanced Innovation Center for Big Data and Brain Computing Jiangxi Research Institute Beihang University Beijing China DeepMotion

State-of-the-art deep learning based stereo matching approaches treat disparity estimation as a regression problem, where loss function is directly defined on true disparities and their estimated ones. However, disparity is just a byproduct of a matching process modeled by cost volume, while indirectly learning cost volume driven by disparity regression is prone to overfitting since the cost volume is under constrained. In this paper, we propose to directly add constraints to the cost volume by filtering cost volume with unimodal distribution peaked at true disparities. In addition, variances of the unimodal distributions for each pixel are estimated to explicitly model matching uncertainty under different contexts. The proposed architecture achieves state-of-the-art performance on Scene Flow and two KITTI stereo benchmarks. In particular, our method ranked the 1st place of KITTI 2012 evaluation and the 4th place of KITTI 2015 evaluation (recorded on 2019.8.20). The codes of AcfNet are available at: https://***/DeepMotionAIresearch/ DenseMatchingBenchmark. Copyright © 2019, The Authors. All rights reserved.

关键词： Uncertainty analysis

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