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EAEEIE Annual Conference,

作者： Ane Portillo-Blanco José Gutierrez-Berraondo Lorenzo Trombetti Kristina Zuza Spiros Sirmakessis Alessio Moriconi Edurne Iturbe-Zabalo Linda Barelli Stefano Pasqua Applied Physics Department UPV/EHU Gipuzkoa Donostia-San Sebastian Spain IMH Campus Azkue Auzoa Elgoibar Spain Engineering Department University of Perugia Perugia Italia Department of Electrical and Computer Engineering University of Peloponnese Patras Greece E-Learning and Multimedia Services Off University of Perugia Perugia Italia

Technological evolution generates the necessity for innovation in companies. The STEAM-ACTIVE project (KA2-Erasmus+) aims to contribute to higher education innovation to train university students to meet market needs, i.e. to produce meaningful learning, and to develop multiple competencies according to an interdisciplinary approach to solve socio-scientific-technical ***, the STEAM-Active project aims to i) improve engineering teachers ’knowledge and experience using innovative educational methodologies such as STEAM, ii) enhance students ’performance in engineering-related social issues by promoting their ability to integrate different disciplines in solving one problem as well as thinking about the environmental impact their actions have and iii) fight against gender inequality among students and increasing women's participation in engineering students and *** project is aimed at university professors invited to include STEAM methodologies in their classes. Consequently, also engineering degree students will benefit from the STEAM-Active *** a result, a Protocol has been developed for Teachers to illustrate the STEAM project design methodology framework with active teaching methodologies. Moreover, an E-learning-based training course for engineering teachers will be realized, including a theoretical description both, of STEAM approaches and active methodologies’ implementation. As a final result, a collection of STEAM-based Teaching-Learning Sequences (TLS) will be designed. This material will allow teachers to guide students in applying a project-based learning methodology to solve specific challenges with socio-scientific-technological implications including gender and circular economy aspects in a multidisciplinary environment.

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Iterative Adaptive Spectroscopy of Short Signals

arXiv

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arXiv 2022年

作者： Chowdhury, Avishek Le, Anh Tuan Weig, Eva M. Ribeiro, Hugo Department of Electrical & Computer Engineering Technical University of Munich Munich80333 Germany Schellingstr. 4 Munich80799 Germany Department of Physics and Applied Physics University of Massachusetts Lowell LowellMA01854 United States

We develop an iterative, adaptive frequency sensing protocol based on Ramsey interferometry of a two-level system. Our scheme allows one to estimate unknown frequencies with a high precision from short, finite signals. It avoids several issues related to processing of decaying signals and reduces the experimental overhead related to sampling. High precision is achieved by enhancing the Ramsey sequence to prepare with high fidelity both the sensing and readout state and by using an iterative procedure built to mitigate systematic errors when estimating frequencies from Fourier transforms. © 2022, CC BY.

关键词： Systematic errors

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High threshold codes for neutral atom qubits with biased erasure errors

arXiv

引用

arXiv 2023年

作者： Sahay, Kaavya Jin, Junlan Claes, Jahan Thompson, Jeff D. Puri, Shruti Yale University Department of Applied Physics New HavenCT06520 United States Yale Quantum Institute Yale University New HavenCT06511 United States Princeton University Department of Electrical and Computer Engineering PrincetonNJ08544 United States

The requirements for fault-tolerant quantum error correction can be simplified by leveraging structure in the noise of the underlying hardware. In this work, we identify a new type of structured noise motivated by neutral atom qubits, biased erasure errors, which arises when qubit errors are dominated by detectable leakage from only one of the computational states of the qubit. We study the performance of this model using gate-level simulations of the XZZX surface code. Using the predicted erasure fraction and bias of metastable 171Yb qubits, we find a threshold of 8.2% for two-qubit gate errors, which is 1.9 times higher than the threshold for unbiased erasures, and 7.5 times higher than the threshold for depolarizing errors. Surprisingly, the improved threshold is achieved without bias-preserving controlled-not gates, and instead results from the lower noise entropy in this model. We also introduce an XZZX cluster state construction for measurement-based error correction, hybrid-fusion, that is optimized for this noise model. By combining fusion operations and deterministic entangling gates, this construction preserves the intrinsic symmetry of the XZZX code, leading to a higher threshold of 10.3% and enabling the use of rectangular codes with fewer qubits. We discuss a potential physical implementation using a single plane of atoms and moveable tweezers. Copyright © 2023, The Authors. All rights reserved.

关键词： Qubits

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Ferroelectric AlBN Films by Molecular Beam Epitaxy

arXiv

引用

arXiv 2024年

作者： Savant, Chandrashekhar Gund, Ved Nomoto, Kazuki Maeda, Takuya Jadhav, Shubham Lee, Joongwon Ramesh, Madhav Kim, Eungkyun Nguyen, Thai-Son Chen, Yu-Hsin Casamento, Joseph Rana, Farhan Lal, Amit Xing, Huili Grace Jena, Debdeep Department of Materials Science and Engineering Cornell University IthacaNY14853 United States School of Electrical and Computer Engineering Cornell University IthacaNY14853 United States Kavli Institute Cornell for Nanoscale Science Cornell University IthacaNY14853 United States School of Applied and Engineering Physics Cornell University IthacaNY14853 United States

We report the properties of molecular beam epitaxy deposited AlBN thin films on a recently developed epitaxial nitride metal electrode Nb2N. While a control AlN thin film exhibits standard capacitive behavior, distinct ferroelectric switching is observed in the AlBN films with increasing Boron mole fraction. The measured remnant polarization Pr ∼ 15 µC/cm2 and coercive field Ec ∼ 1.45 MV/cm in these films are smaller than those recently reported on films deposited by sputtering, due to incomplete wake-up, limited by current leakage. Because AlBN preserves the ultrawide energy bandgap of AlN compared to other nitride hi-K dielectrics and ferroelectrics, and it can be epitaxially integrated with GaN and AlN semiconductors, its development will enable several opportunities for unique electronic, photonic, and memory devices. © 2024, CC BY-NC-ND.

关键词： III-V semiconductors

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Exemplar-Based Radio Map Reconstruction of Missing Areas Using Propagation Priority

arXiv

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arXiv 2022年

作者： Zhang, Songyang Yu, Tianhang Tivald, Jonathan Choi, Brian Ouyang, Feng Ding, Zhi Department of Electrical and Computer Engineering University of California DavisCA95616 United States Applied Physics Laboratory Johns Hopkins University LaurelMD20723 United States

Radio map describes network coverage and is a practically important tool for network planning in modern wireless systems. Generally, radio strength measurements are collected to construct fine-resolution radio maps for analysis. However, certain protected areas are not accessible for measurement due to physical constraints and security considerations, leading to blanked spaces on a radio map. Non-uniformly spaced measurement and uneven observation resolution make it more difficult for radio map estimation and spectrum planning in protected areas. This work explores the distribution of radio spectrum strengths and proposes an exemplar-based approach to reconstruct missing areas on a radio map. Instead of taking generic image processing approaches, we leverage radio propagation models to determine directions of region filling and develop two different schemes to estimate the missing radio signal power. Our test results based on high-fidelity simulation demonstrate efficacy of the proposed methods for radio map reconstruction. © 2022, CC BY.

关键词： Image processing

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Projective squeezing for translation symmetric bosonic codes

arXiv

引用

arXiv 2024年

作者： Endo, Suguru Anai, Keitaro Matsuzaki, Yuichiro Tokunaga, Yuuki Suzuki, Yasunari NTT Computer and Data Science Laboratories NTT Corporation Tokyo Musashino180-8585 Japan Department of Applied Physics School of Engineering The University of Tokyo 7-3-1 Hongo Bunkyo-ku Tokyo113-8656 Japan Department of Electrical Electronic and Communication Engineering Faculty of Science and Engineering Chuo university 1-13-27 Kasuga Bunkyo-ku Tokyo112-8551 Japan

The design of translation symmetric bosonic codes, e.g., Gottesmann-Kitaev-Preskill and squeezed cat codes, is robust against photon loss, but the computation accuracy is limited by the available squeezing level. Here, we introduce the projective squeezing (PS) method for computing outcomes for a higher squeezing level by revealing that a linear combination of displacement operators with periodic displacement values constitutes the smeared projector onto the better code space;we also show the analytical relationship between the increased squeezing level and the projection probability. We introduce concrete implementation methods for PS based on linear-combination-of-unitaries and virtual quantum error detection. We also numerically verify our analytical arguments and show that our protocol can mitigate the effect of photon loss. Copyright © 2024, The Authors. All rights reserved.

关键词： Photons

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Temporal mode shaping of single photons from a solid-state quantum emitter

Temporal mode shaping of single photons from a solid-state q...

引用

CLEO: Science and Innovations, S and I 2022

作者： Kim, Kyu Young Richardson, Christopher J.K. Waks, Edo Kim, Je-Hyung Department of Physics Ulsan National Institute of Science and Technology Ulsan44919 Korea Republic of Laboratory for Physical Sciences University of Maryland College ParkMD20740 United States Department of Electrical and Computer Engineering Institute for Research in Electronics and Applied Physics University of Maryland College ParkMD20742 United States Joint Quantum Institute University of Maryland The National Institute of Standards and Technology College ParkMD20742 United States

Through multi-exciton cascade recombination in a quantum dot and engineered Purcell effect in a photonic crystal cavity, we demonstrate the single-photon emission with Gaussian-like spatial and temporal modes and temp... 详细信息

ISBN: (纸本)9781557528209

关键词： Photons

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Unraveling exciton dynamics in an atomically thin van der Waals magnet

Unraveling exciton dynamics in an atomically thin van der Wa...

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International Conference on Infrared and Millimeter Waves

作者： Niloufar Nilforoushan Christian Meineke Jakob Schlosser Martin Zizlsperger Marlene Liebich Kseniia Mosina Sophia Terres Alexey Chernikov Zdenek Sofer Markus A. Huber Matthias Florian Mackillo Kira Florian Dirnberger Rupert Huber Department of Physics and Regensburg Center for Ultrafast Nanoscopy (RUN) University of Regensburg Regensburg Germany Department of Inorganic Chemistry University of Chemistry and Technology Prague Prague 6 Czech Republic Institute of Applied Physics and Würzburg-Dresden Cluster of Excellence Dresden University of Technology Dresden Germany Dept. of Electrical Engineering and Computer Science University of Michigan Ann Arbor MI USA

ISBN: (数字)9798350370324

ISBN: (纸本)9798350370331

Within the realm of atomically thin semiconductors, CrSBr stands out uniquely as it harbors quasi-one-dimensional magnetic excitons in both its bulk and monolayer forms. Despite its fundamental significance, the precise exciton formation, relaxation and decay dynamics remained elusive. While terahertz polarization probing offers a direct avenue for tracking excitons, the resulting far-field signal can be affected by signals originating beyond the lateral dimensions of the sample. Here, we combine terahertz polarization spectroscopy with near-field microscopy to unveil the sub-picosecond decay dynamics of paramagnetic excitons in a CrSBr monolayer, which is faster by a factor of 30 than its bulk counterpart. Our analysis also unravels low-energy fingerprints of bound and unbound electron-hole pairs in bulk and gives access to the non-equilibrium dielectric function of the monolayer. These findings provide direct insight into the ultrafast dielectric response of quasi-one-dimensional excitons in CrSBr, with potential applications in quantum devices leveraging ultrathin van der Waals magnets.

关键词： Spectroscopy Millimeter wave devices Excitons Atomic layer deposition Fingerprint recognition Dielectrics Electron microscopy Magnets Magnetic semiconductors Magnetic force microscopy

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Unbiased Parameter Estimation for Bayesian Inverse Problems

arXiv

引用

arXiv 2025年

作者： Chada, Neil K. Jasra, Ajay Maama, Mohamed Tempone, Raul Department of Mathematics City University of Hong Kong China School of Data Science The Chinese University of Hong Kong Shenzhen CN Shenzhen China Applied Mathematics and Computational Science Program Computer Electrical and Mathematical Sciences and Engineering Division King Abdullah University of Science and Technology Thuwal23955-6900 Saudi Arabia

In this paper we consider the estimation of unknown parameters in Bayesian inverse problems. In most cases of practical interest, there are several barriers to performing such estimation, This includes a numerical approximation of a solution of a differential equation and, even if exact solutions are available, an analytical intractability of the marginal likelihood and its associated gradient, which is used for parameter estimation. The focus of this article is to deliver unbiased estimates of the unknown parameters, that is, stochastic estimators that, in expectation, are equal to the maximizer of the marginal likelihood, and possess no numerical approximation error. Based upon the ideas of [4] we develop a new approach for unbiased parameter estimation for Bayesian inverse problems. We prove unbiasedness and establish numerically that the associated estimation procedure is faster than the current state-of-the-art methodology for this problem. We demonstrate the performance of our methodology on a range of problems which include a PDE and ODE. Copyright © 2025, The Authors. All rights reserved.

关键词： Markov processes

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Spectral Width of Maximum Deposition Eigenchannels in Diffusive Media

arXiv

引用

arXiv 2024年

作者： McIntosh, Rohin E. Goetschy, Arthur Bender, Nicholas Yamilov, Alexey Hsu, Chia Wei Yilmaz, Hasan Cao, Hui Department of Physics Yale University New HavenCT06511 United States Institut Langevin ESPCI Paris PSL University CNRS ParisF-75005 France School of Applied and Engineering Physics Cornell University IthacaNY14850 United States Physics Department Missouri University of Science & Technology RollaMO United States Ming Hsieh Department of Electrical and Computer Engineering University of Southern California Los AngelesCA90089 United States Bilkent University Ankara06800 Turkey

The maximum deposition eigenchannel provides the largest possible power delivery to a target region inside a diffusive medium by optimizing the incident wavefront of a monochromatic beam. It originates from constructive interference of scattered waves, which is frequency sensitive. We investigate the spectral width of maximum deposition eigenchannels over a range of target depths using numerical simulations of a 2D diffusive system. Compared to tight focusing into the system, power deposition to an extended region is more sensitive to frequency detuning. The spectral width of enhanced delivery to a large target displays a rather weak, non-monotonic variation with target depth, in contrast to a sharp drop of focusing bandwidth with depth. While the maximum enhancement of power deposited within a diffusive system can exceed that of power transmitted through it, this comes at the cost of a narrower spectral width. We investigate the narrower deposition width in terms of the constructive interference of transmission eigenchannels within the target. We further observe that the spatial field distribution inside the target region decorrelates slower with spectral detuning than power decay of the maximum deposition eigenchannel. Additionally, absorption increases the spectral width of deposition eigenchannels, but the depth dependence remains qualitatively identical to that without absorption. These findings hold for any diffusive waves, including electromagnetic waves, acoustic waves, pressure waves, mesoscopic electrons, and cold atoms. © 2024, CC BY.

关键词： Wavefronts

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