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arXiv 2023年

作者： Erb, Jared Shrekenhamer, David Sleasman, Timothy Antonsen, Thomas M. Anlage, Steven M. Quantum Materials Center Department of Physics University of Maryland College ParkMD20742-4111 United States Johns Hopkins University Applied Physics Laboratory LaurelMD20723 United States Department of Physics University of Maryland College ParkMD20742-4111 United States Department of Electrical and Computer Engineering University of Maryland College ParkMD20742-3285 United States

We demonstrate the ability to control the scattering properties of a two-dimensional wave-chaotic microwave billiard through the use of tunable metasurfaces located on the interior walls of the billiard. The complex reflection coefficient of the metasurfaces can be varied by applying a DC voltage bias to varactor diodes on mushroom-shaped resonant patches, and this proves to be very effective at perturbing the eigenmodes of the cavity. Placing multiple metasurfaces inside the cavity allows us to engineer desired scattering conditions, such as coherent perfect absorption (CPA), by actively manipulating the poles and zeros of the scattering matrix through the application of multiple voltage biases. We demonstrate the ability to create on-demand CPA conditions at a specific frequency, and document the near-null of output power as a function of four independent parameters tuned through the CPA point. A remarkably low output-to-input power ratio of Pout/Pin = 3.71 × 10−8 is achieved near the CPA point at 8.54 GHz. © 2023, CC BY.

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Z-Scan Measurements on Nonlinear Absorption and Refraction of Physical Vapor Deposition-Grown Cr2Te3 at a Wavelength of 1560 nm

Z-Scan Measurements on Nonlinear Absorption and Refraction o...

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Conference on Lasers and Electro-Optics Europe (CLEO EUROPE)

作者： Kyungtaek Lee In Hak Lee Yeong Gwang Kim Suh-young Kwon Geunweon Lim Junha Jung Young Jun Chang Ju Han Lee School of Electrical and Computer Engineering University of Seoul Seoul South Korea Department of Physics University of Seoul Seoul South Korea Department of Smart Cities University of Seoul Seoul South Korea

ISBN: (纸本)9798350345995

Over the past few decades, two-dimensional (2D) nanomaterials have been widely utilized in field of nonlinear photonics [1]. Instabilities to environmental conditions and/or the absence of appropriate synthesis methods for controlling the morphologies of 2D nanomaterials have degraded their electronic and optical performances [2]. Therefore, it is crucial that new 2D materials are identified and used, along with well-defined methods to synthesize them. Bottom-up synthesis and particularly physical vapor deposition (PVD) is known to provide high-quality 2D nanomaterials that allow full control over the layer number, morphology, orientation, phase, and defects [3].

关键词： Absorption coefficient Nanostructures Nonlinear absorption Physical vapor deposition Synthesis methods Thin films

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Entanglement from rotating black holes in thermal baths

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Physical Review D 2024年第2期110卷 025021-025021页

作者： Ivan Agullo Anthony J. Brady Adrià Delhom Dimitrios Kranas Department of Physics and Astronomy Louisiana State University Baton Rouge Louisiana 70803 USA Perimeter Institute for Theoretical Physics 31 Caroline Street North Waterloo Ontario N2L 2Y5 Canada Department of Electrical and Computer Engineering University of Arizona Tucson Arizona 85721 USA Laboratory of Theoretical Physics Institute of Physics University of Tartu West Ostwaldi 1 50411 Tartu Estonia

We extend previous efforts to quantify the entanglement generated in Hawking’s evaporation process by including rotation and thermal environments (e.g. the cosmic microwave background). Both extensions are needed to describe real black holes in our Universe. Leveraging techniques from Gaussian quantum information, we find that the black hole’s ergoregion is an active source of quantum entanglement and that thermal environments drastically degrade entanglement generation. Our predictions are suitable to be tested in the lab using analog platforms and also provide tools to assess the fate of quantum information for black holes in more generic settings.

关键词： Quantum aspects of black holes Quantum fields in curved spacetime

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Radio Frequency Energy Harvesting System and the Utilization of Blockchain Technologies in Agriculture 10

Radio Frequency Energy Harvesting System and the Utilization...

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10th International Conference on Information and Communication Technologies in Agriculture, Food and Environment, HAICTA 2022

作者： Krystallidou, Evdokia Boursianis, Achilles Diamantoulakis, Panagiotis Goudos, Sotirios Karagiannidis, George Siachamis, Giorgos Stavropoulos, Georgios Ioannidis, Dimosthenis Tzovaras, Dimitrios American Farm School Thessaloniki57001 Greece ELEDIA@AUTH Department of Physics Aristotle University of Thessaloniki Thessaloniki Greece Department of Electrical and Computer Engineering Aristotle University of Thessaloniki Thessaloniki54124 Greece Centre for Research & Technology Hellas Information Technologies Institute Thessaloniki57001 Greece

Modern agriculture and livestock breeding look for sustainable models that improve the efficiency of their ecosystem, while providing a secure and privacy-preserving IoT ecosystem. Multi-collected and heterogeneous data coming from crops, livestock, or even better from mixed farming systems that are coupled with AI capabilities is a promising approach that enhances agriculture systems. Such technologies aim at transforming farmers everyday live, promising accessibility, personalization and precision to the users, but they also suffer from significant issues. In particular, security, integrity and auditability have been major issues that need to be addressed, and one way of dealing with the aforementioned is by using Distributed Ledger Technologies (DLT), such as blockchain. © 2022 Copyright for this paper by its authors. Use permitted under Creative Commons License Attribution 4.0 International (CC BY 4.0)

关键词： Blockchain

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Topological Mode-Locked Laser with Intracavity Couplings

Topological Mode-Locked Laser with Intracavity Couplings

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Conference on Lasers and Electro-Optics (CLEO)

作者： Christian Leefmans Midya Parto James Williams Avik Dutt Franco Nori Alireza Marandi Department of Applied Physics Caltech Pasadena CA USA Department of Electrical Engineering Caltech Pasadena CA USA Department of Electrical Engineering Stanford University Stanford CA USA Theoretical Quantum Physics Laboratory RIKEN Saitama Japan Department of Physics University of Michigan Ann Arbor Michigan USA

We experimentally realize a topological actively mode-locked laser by coupling the pulses with intracavity delay lines. Our work reveals a new regime of nonlinear topological photonics and has potential applications t... 详细信息

ISBN: (数字)9781957171050

ISBN: (纸本)9781665466660

关键词： Couplings Electric potential Laser mode locking Delay lines Laser applications Electrooptical waveguides Photonics

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Few-Shot, Robust Calibration of Single Qubit Gates Using Bayesian Robust Phase Estimation

Few-Shot, Robust Calibration of Single Qubit Gates Using Bay...

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Quantum Computing and engineering (QCE), IEEE International Conference on

作者： Travis Hurant Ke Sun Zhubing Jia Jungsang Kim Kenneth R. Brown Duke Quantum Center Duke University Durham NC USA Department of Electrical and Computer Engineering Duke University Durham NC USA Department of Physics Duke University Durham NC USA Department of Physics The University of Illinois at Urbana-Champaign Urbana IL USA Department of Chemistry Duke University Durham NC USA

ISBN: (数字)9798331541378

ISBN: (纸本)9798331541385

Accurate calibration of control parameters in quan-tum gates is crucial for high-fidelity operations, yet it represents a significant time and resource challenge, necessitating periods of downtime for quantum computers. Robust Phase Estimation (RPE) [8] has emerged as a practical and effective calibration technique aimed at tackling this challenge. It combines a provably efficient number of control pulses with a classical post-processing algorithm to estimate the phase accumulated by a quantum gate. We introduce Bayesian Robust Phase Estimation (BRPE), an in-novative approach that integrates Bayesian parameter estimation into the classical post-processing phase to reduce the sampling overhead. Our numerical analysis shows that BRPE markedly reduces phase estimation errors, requiring approximately 50% fewer samples than standard RPE. Specifically, in an ideal, noise-free setting, it achieves up to a 96% reduction in average absolute estimation error for a fixed sample cost of 88 shots when compared to RPE. Under a depolarizing noise model, it attains up to a 47% reduction for a fixed cost of 1 76 shots. Additionally, we adapt BRPE for Ramsey spectroscopy applications and successfully implement it experimentally in a trapped ion system.

关键词： computers Trapped ions Accuracy Costs Computational modeling Phase estimation Logic gates Bayes methods Calibration Reliability

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Exact Steering Bound for Two-Qubit Werner States

arXiv

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arXiv 2023年

作者： Zhang, Yujie Chitambar, Eric Department of Physics University of Illinois at Urbana-Champaign UrbanaIL61801 United States Department of Electrical and Computer Engineering University of Illinois at Urbana-Champaign UrbanaIL61801 United States

We investigate the relationship between projective measurements and positive operator-valued measures (POVMs) in the task of quantum steering. A longstanding open problem in the field has been whether POVMs are more powerful than projective measurements for the steerability of noisy singlet states, which are known as Werner states. We resolve this problem for two-qubit systems and show that the two are equally powerful, thereby closing the so-called Werner gap. Using the incompatible criteria for noisy POVMs and the connection between quantum steering and measurement incompatibility, we construct a local hidden state model for Werner states with Bloch sphere radius r ≤ 1/2 under general POVMs. This construction also provides a local hidden variable model for a larger range of Werner states than previously known. In contrast, we also show that projective measurements and POVMs can have inequivalent noise tolerances when using a fixed state ensemble to build different local hidden state models. These results help clarify the relationship between projective measurements and POVMs for the tasks of quantum steering and nonlocal information processing. Copyright © 2023, The Authors. All rights reserved.

关键词： Qubits

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Thermalization of Interacting Quasi-One-Dimensional Systems

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Physical Review Letters 2023年第3期130卷 030401-030401页

作者： Miłosz Panfil Sarang Gopalakrishnan Robert M. Konik Faculty of Physics University of Warsaw ul. Pasteura 5 02-093 Warsaw Poland Department of Physics The Pennsylvania State University University Park Pennsylvania 16802 USA Department of Electrical and Computer Engineering Princeton University Princeton New Jersey 08544 USA Condensed Matter Physics and Materials Science Division Brookhaven National Laboratory Upton New York 11973 USA

Many experimentally relevant systems are quasi-one-dimensional, consisting of nearly decoupled chains. In these systems, there is a natural separation of scales between the strong intrachain interactions and the weak interchain coupling. When the intrachain interactions are integrable, weak interchain couplings play a crucial part in thermalizing the system. Here, we develop a Boltzmann-equation formalism involving a collision integral that is asymptotically exact for any interacting integrable system, and apply it to develop a quantitative theory of relaxation in coupled Bose gases in the experimentally relevant Newton’s cradle setup. We find that relaxation involves a broad spectrum of timescales. We provide evidence that the Markov process governing relaxation at late times is gapless; thus, the approach to equilibrium is generally nonexponential, even for spatially uniform perturbations.

关键词： Cold atoms & matter waves Nonequilibrium statistical mechanics Bose gases Boltzmann theory

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Non-Abelian Frame Charge Flow in Photonic Media

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Physical Review X 2023年第2期13卷 021024-021024页

作者： Dongyang Wang Ying Wu Z. Q. Zhang C. T. Chan Department of Physics and Center for Metamaterials Research Hong Kong University of Science and Technology Hong Kong China Division of Computer Electrical and Mathematical Science and Engineering King Abdullah University of Science and Technology (KAUST) Thuwal 23955-6900 Saudi Arabia

In PT-symmetric systems, the notion of non-Abelian frame charges enables multiband topological characterization of degeneracies by examining the eigenvector-frame rotations. Interestingly, some features of these frame charges can be viewed as an analog of electric charges confined in conducting wires, only that they flow in momentum space along nodal lines. But different from electric charges, these frame charges are not integers, and non-Abelian signatures emerge when braiding between adjacent band nodal lines occurs, which flips the direction of the flow. In photonic systems, the photonic Γ point serves as the source or sink of such a frame charge flow due to a hidden braiding induced by the often-ignored electrostatic mode at zero frequency. This source naturally generates non-Abelian topological signatures in PT-symmetric photonic systems that can be identified even in ordinary dielectric media. We use biaxial photonic crystals as examples to show how complex nodal line configurations can be explained as the topological consequences of the frame charge flow from the Γ point to the Brillouin zone boundaries. Our results reveal that non-Abelian band topology is intrinsically manifested in general photonic systems, making them easily accessible platforms for exploring non-Abelian physics.

关键词： Metamaterials Symmetry protected topological states Topological effects in photonic systems

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QAM receiver based on light amplifiers measured with effective role of optical coherent duobinary transmitter

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Journal of Optical Communications 2024年第0期45卷 s445-s452页

作者： Eid, Mahmoud M. A. Arunachalam, Rajesh Sorathiya, Vishal Lavadiya, Sunil Patel, Shobhit K. Parmar, Juveriya Delwar, Tahesin Samira Ryu, Jee Youl Nyangaresi, Vincent Omollo Zaki Rashed, Ahmed Nabih Department of Electrical Engineering College of Engineering Taif University Taif Saudi Arabia Telangana Hyderabad501510 India Department of Information and Communication Technology Marwadi University Rajkot India Department of Electronics and Communication Engineering Marwadi University Rajkot360003 India Department of Computer Engineering Marwadi University Rajkot360003 India Department of Physics Marwadi University Rajkot360003 India Department of Smart Robotics and Application Engineering Pukyong National University Busan Korea Republic of Tom Mboya University College P.O. Box 199-40300 Homabay Kenya Electronics and Electrical Communications Engineering Department Faculty of Electronic Engineering Menoufia University Menouf32951 Egypt

Effective role of optical duobinary transmitter with optical coherent quadrature amplitude modulation (QAM) receiver based on light amplifiers measured is stimulated by using optisystem simulation software version 13. Signal, noise power levels are stimulated after long haul fiber optic range up to 350 km distance. Measured light amplifiers, optical duobinary transmitters and optical QAM receiver are employed to measure the peak signal amplitude power (SAP) and noise signal power for bit rate transmission with 100 Gb/s based 350 km length. Maximum signal power level margin is enhanced with high data rates transmission. © 2022 Walter de Gruyter GmbH, Berlin/Boston.

关键词： Quadrature amplitude modulation

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