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arXiv 2024年

作者： Reichardt, Ben W. Paetznick, Adam Aasen, David Basov, Ivan Bello-Rivas, Juan M. Bonderson, Parsa Chao, Rui van Dam, Wim Hastings, Matthew B. Paz, Andres da Silva, Marcus P. Sundaram, Aarthi Svore, Krysta M. Vaschillo, Alexander Wang, Zhenghan Zanner, Matt Cairncross, William B. Chen, Cheng-An Crow, Daniel Kim, Hyosub Kindem, Jonathan M. King, Jonathan McDonald, Michael Norcia, Matthew A. Ryou, Albert Stone, Mark Wadleigh, Laura Barnes, Katrina Battaglino, Peter Bohdanowicz, Thomas C. Booth, Graham Brown, Andrew Brown, Mark O. Cassella, Kayleigh Coxe, Robin Epstein, Jeffrey M. Feldkamp, Max Griger, Christopher Halperin, Eli Heinz, Andre Hummel, Frederic Jaffe, Matthew Jones, Antonia M.W. Kapit, Eliot Kotru, Krish Lauigan, Joseph Li, Ming Marjanovic, Jan Megidish, Eli Meredith, Matthew Morshead, Ryan Muniz, Juan A. Narayanaswami, Sandeep Nishiguchi, Ciro Paule, Timothy Pawlak, Kelly A. Pudenz, Kristen L. Pérez, David Rodríguez Simon, Jon Smull, Aaron Stack, Daniel Urbanek, Miroslav van de Veerdonk, René J.M. Vendeiro, Zachary Weverka, Robert T. Wilkason, Thomas Wu, Tsung-Yao Xie, Xin Zalys-Geller, Evan Zhang, Xiaogang Bloom, Benjamin J. Microsoft Azure Quantum Atom Computing Department of Electrical and Computer Engineering University of Southern California United States Department of Physics Colorado School of Mines United States Department of Physics Department of Applied Physics Stanford University United States

Transitioning from quantum computation on physical qubits to quantum computation on encoded, logical qubits can improve the error rate of operations, and will be essential for realizing valuable quantum computational advantages. Using a neutral atom quantum processor with 256 qubits, each an individual Ytterbium atom, we demonstrate the entanglement of 24 logical qubits using the distance-two J4,2,2K code, simultaneously detecting errors and correcting for lost qubits. We also implement the Bernstein-Vazirani algorithm with up to 28 logical qubits encoded in the J4,1,2K code, showing better-than-physical error rates. We demonstrate fault-tolerant quantum computation in our approach, guided by the proposal of Gottesman (2016), by performing repeated loss correction for both structured and random circuits encoded in the J4,2,2K code. Finally, since distance-two codes can correct qubit loss, but not other errors, we show repeated loss and error correction using the distance-three J9,1,3K Bacon-Shor code. These results begin to clear a path for achieving scientific quantum advantage with a programmable neutral atom quantum processor. Copyright © 2024, The Authors. All rights reserved.

关键词： Qubits

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Hyperbolic Diffusion Procrustes Analysis for Intrinsic Representation of Hierarchical Data Sets

Hyperbolic Diffusion Procrustes Analysis for Intrinsic Repre...

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International Conference on Acoustics, Speech, and Signal Processing (ICASSP)

作者： Ya-Wei Eileen Lin Yuval Kluger Ronen Talmon Viterbi Faculty of Electrical and Computer Engineering Technion Interdepartmental Program in Computational Biology and Bioinformatics Yale University Applied Math Program Yale University Department of Pathology School of Medicine Yale University

In this paper, we present Hyperbolic Diffusion Procrustes Analysis (HDPA), a new method for informative representation of hierarchical datasets based on hyperbolic geometry, diffusion geometry, and Procrustes analysis. Our method jointly embeds multiple datasets in a product manifold of hyperbolic spaces, where the data's hidden common hierarchical structure is provably recovered. In addition, our method generates an intrinsic embedding that accommodates the joint representation of multiple datasets with different features, acquired by different equipment, at different sites, or under different environmental conditions. Experimental results demonstrate the efficacy of HDPA on three biomedical datasets comprising heterogeneous gene expression and mass cytometry data.

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Linear FM Pulse Radar Simulation for Through-Wall Target Detection at 2.4 GHz

Linear FM Pulse Radar Simulation for Through-Wall Target Det...

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IEEE Southeastcon

作者： Zachary Reyes Jalexis E. Vanga Guzman Sungkyun Lim Department of Electrical and Computer Engineering Georgia Southern University Statesboro GA USA Air and Missle Defense Sector JHU Applied Physics Laboratory Laurel MD USA

ISBN: (数字)9798331504847

ISBN: (纸本)9798331504854

Radars centered in the S-band face challenges in through-wall target detection applications due to high attenuation through lossy dielectrics. This paper discusses applications in target detection, angle-of-arrival (AOA), and range estimation utilizing a proposed pulse linear frequency modulated (LFM) radar centered at 2.4 GHz with a bandwidth of 200 MHz and theoretical maximum range of 300 m. This paper simulates through-wall signal strength at the end of a room at various distances, and target detection of one human target through a lossy 15 cm concrete wall.

关键词： Frequency modulation Radar measurements Pulse measurements Radar detection Radar Object detection Radar imaging Loss measurement MATLAB Signal to noise ratio

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A holistically 3D-printed flexible millimeter-wave Doppler radar: Towards fully printed high-frequency multilayer flexible hybrid electronics systems

arXiv

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arXiv 2023年

作者： Tang, Hong Zhang, Yingjie Zheng, Bowen An, Sensong Haerinia, Mohammad Dong, Yunxi Huang, Yi Guo, Wei Zhang, Hualiang Department of Electrical and Computer Engineering University of Massachusetts LowellMA United States Department of Physics and Applied Physics University of Massachusetts LowellMA United States

Flexible hybrid electronics (FHE) is an emerging technology enabled through the integration of advanced semiconductor devices and 3D printing technology. It unlocks tremendous market potential by realizing low-cost flexible circuits and systems that can be conformally integrated into various applications. However, the operating frequencies of most reported FHE systems are relatively low. It is also worth to note that reported FHE systems have been limited to relatively simple design concept (since complex systems will impose challenges in aspects such as multilayer interconnections, printing materials, and bonding layers). Here, we report a fully 3D-printed flexible four-layer millimeter-wave Doppler radar (i.e., a millimeter-wave FHE system). The sensing performance and flexibility of the 3D-printed radar are characterized and validated by general field tests and bending tests, respectively. Our results demonstrate the feasibility of developing fully 3D-printed high-frequency multilayer FHE, which can be conformally integrated into irregular surfaces (e.g., vehicle bumpers) for applications such as vehicle radars and wearable *** Codes 78-05 © 2023, CC BY.

关键词： Flexible electronics

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Camera-based Motion Correction for PET/MR Brain Imaging

Camera-based Motion Correction for PET/MR Brain Imaging

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2022 IEEE Nuclear Science Symposium, Medical Imaging Conference, and Room Temperature Semiconductor Detector Conference, IEEE NSS MIC RTSD 2022

作者： Fisher, Jonathan Groll, Andrew Kim, Chris C. Innes, Derek Levin, Craig S. Stanford University Department of Electrical Engineering CA United States Molecular Imaging Program Stanford University Department of Radiology CA United States Stanford University Department of Computer Science CA United States Stanford University Physics Electrical Engineering and Bioengineering Department of Radiology CA United States

ISBN: (纸本)9781665488723

In this work, we evaluated the performance of a camera-based rigid body motion correction solution in PET studies. We compared the image quality obtained by reconstructing a static phantom scan to those obtained by reconstructing a moving phantom scan with and without applying motion correction. Our suggested solution uses a camera to track a 3D marker attached to the object to be imaged (in this work, a resolution phantom). This data was incorporated in the multiple acquisition frames (MAF) image reconstruction algorithm to compensate for motion. While we got multiple spatially shifted replicas of the resolution phantom in the motion study's reconstructed image when motion correction was not applied, the motion-corrected image was comparable to the static image, with some degradation in spatial resolution (3.2-4.2 vs. 2.8-3.2 mm) and lower peak to valley ratio (indicating lower contrast to noise ratio). The context of the results presented is in PET/MR imaging, but in principle, this motion compensation method could be used in any type of medical imaging modality. © 2022 IEEE.

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Through-Wall Human Sensing Using mmWave FMCW Radar 4

Through-Wall Human Sensing Using mmWave FMCW Radar

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4th Research, Invention, and Innovation Congress: Innovative electricals and Electronics, RI2C 2023

作者： Phaisiri, Kritthee Boonpoonja, Akkarat Kittiyanpunya, Chainarong Kaemarungsi, Kamol Chudpooti, Nonchanutt Department of Electrical and Computer Engineering Faculty of Engineering King Mongkut’s University of Technology North Bangkok Bangkok Thailand Department of Mechatronics Engineering Faculty of Engineering Rajamangala University of Technology Rattanakosin Nakhon Pathom Thailand National Electronics and Computer Technology Center National Science and Technology Development Agency Pathumthani Thailand Department of Industrail Physics and Medical Instrumentation Faculty of Applied Science King Mongkut’s University of Technology North Bangkok Bangkok Thailand

ISBN: (纸本)9798350330618

This paper experimentally demonstrates the through wall sensing to detect human movement using a mmwave FMCW radar operating in the 60 GHz to 64 GHz band. The mmWave radar data processing framework focuses on the generation of point cloud data. Each human movement is illustrated with point cloud data, whose represents the position and orientation of pose, usually in 3D-cartesian coordinate system. In experiments, point cloud data from sensing through two different walls were collected for three activities into a 3 m by 3 m room. The data was analyzed through a comparison between the position of point cloud data and the position of the actual posture movement. The results prove that a mmWave radar placed behind the wall of the room is suitable for human detection and tracking in indoor environments, in terms of consistency with the actual posture. . ©2023 IEEE.

关键词： Frequency modulation

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Inverse Design of Photonic Structures Using Automatic Differentiable Rigorous Diffraction Interface Theory

Inverse Design of Photonic Structures Using Automatic Differ...

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Conference on Lasers and Electro-Optics (CLEO)

作者： Yi Huang Hong Tang Bowen Zheng Yunxi Dong Mohammad Haerinia Viktor A. Podolskiy Hualiang Zhang Department of Electrical and Computer Engineering University of Massachusetts Lowell Lowell Massachusetts USA Department of Physics and Applied Physics University of Massachusetts–Lowell Lowell Massachusetts USA

We present an automatic differentiable R-DIT for the fast inverse design of photonic structures. We demonstrated that the proposed method could achieve a 30% speedup per optimization on GPUs compared with the differen... 详细信息

ISBN: (纸本)9781957171258

关键词： Diffraction theory Fused silica Guided mode resonance Magnetic fields Resonance Rigorous coupled wave analysis

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Generation of rf radiation by low-intensity laser pulse trains in air

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Physical Review E 2023年第1期108卷 015203-015203页

作者： Gavin Blair Phillip Sprangle Department of Electrical and Computer Engineering University of Maryland College Park Maryland 20742 USA and Institute for Research in Electronics and Applied Physics University of Maryland College Park Maryland 20740 USA

In this paper, we analyze and numerically simulate mechanisms for generating directed rf radiation by a low-intensity laser pulse train (LPT) propagating in air. The LPT ionizes the air, forming a plasma filament. The ionization process relies on the background level of radioactivity which plays an important role in initiating a collisional ionization process. In our model a low-intensity LPT photoionizes background negative ions (produced by ambient ionizing radiation) and provides the seed electrons necessary to initiate collisional ionization. The intensity of the LPT is far below tunneling ionization levels. The ponderomotive forces associated with the LPT and self-fields drive plasma oscillations predominately in the radial direction. The driven radial electron currents in turn generate directed rf radiation. As the plasma density builds up on axis, the later portion of the LPT can defocus and limit the interaction length. The spectrum of the rf radiation consists of the fundamental frequency associated with the pulse separation time as well as harmonics. The rf generation mechanism is analyzed using fluid equations which incorporate, among other things, the effects of background radioactivity, photoionization, collisional ionization, ponderomotive and space-charge effects, and electron attachment–recombination processes. As an example, for a specific set of parameters, the rf spectrum and intensity are compared to experimental data.

关键词： Laser-plasma interactions Plasma ionization Plasma production & heating by laser beams, laser-foil, laser-cluster Self-focusing & filamentation in plasmas

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Long-range photodetection of organic exciton-polaritons

Long-range photodetection of organic exciton-polaritons

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CLEO: Science and Innovations, S and I 2022

作者： Liu, Bin Huang, Xinjing Forrest, Stephen R. Department of Electrical Engineering and Computer Science University of Michigan Ann ArborMI48109 United States Applied Physics Program University of Michigan Ann ArborMI48109 United States Department of Physics University of Michigan Ann ArborMI48109 United States Department of Material Science and Engineering University of Michigan Ann ArborMI48109 United States

In light-matter strong coupling regime, we observe long-range photodetection response at room temperature mediated by organic exciton-polaritons, which results from strong interactions between organic excitons and low... 详细信息

ISBN: (纸本)9781557528209

关键词： Excitons

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Fluorescence Lifetime of NV Centers for Temperature-Insensitive All-Optical Magnetic Field Sensing

Fluorescence Lifetime of NV Centers for Temperature-Insensit...

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International Symposium on Symbolic and Numeric Algorithms for Scientific Computing (SYNASC)

作者： Ludwig Horsthemke Jens Pogorzelski Dennis Stiegekötter Frederik Hoffmann Ann-Sophie Bülter Lutz Langguth Robert Staacke Sarah Trinschek Markus Gregor Peter Glösekötter Department of Electrical Engineering and Computer Science FH Münster—University of Applied Sciences Steinfurt Germany Quantum Technologies GmbH Leipzig Germany Department of Engineering Physics FH Münster—University of Applied Sciences Steinfurt Germany

ISBN: (数字)9798331532833

ISBN: (纸本)9798331532840

We investigate the combined temperature and magnetic field dependent behavior of high NV-density microdiamonds in an all-optical frequency-domain based setup, utilizing the change in fluorescence lifetime. We use these frequency-domain data to train neural networks for the prediction of temperatures and magnetic fields. At zero magnetic field, we show the ability to predict temperatures in the range of 0° C to 100°C, with a standard deviation of 1.24 °C. Furthermore, we show the ability to predict applied magnetic fields, while varying the ambient temperature. We achieve a higher accuracy, compared to the approach of observing of the fluorescence intensity at a single excitation frequency.

关键词： Temperature sensors Temperature distribution Temperature dependence Accuracy Scientific computing Frequency-domain analysis Fluorescence Sensors Magnetic fields Standards

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