检索结果-内蒙古大学图书馆

Fast Universal Entangling Gate for Superconducting Quantum computers

学校读者我要写书评

暂无评论

SSRN

SSRN 2024年

作者： AbuGhanem, Muhammad Homid, Ali H. Obada, A.S.-F. Hendy, Ahmed S. Eleuch, Hichem Faculty of Science Ain Shams University Cairo11566 Egypt Zewail City of Science Technology and Innovation Giza12678 Egypt Mathematics Department Faculty of Science Al-Azhar University Assiut71524 Egypt Mathematics Department Faculty of Science Al-Azher University Nassr City Cairo11884 Egypt Department of Computational Mathematics and Computer Science Institute of Natural Sciences and Mathematics Ural Federal University Yekaterinburg Russia Department of Mathematics Faculty of Science Benha University Benha Egypt Department of Applied Physics and Astronomy University of Sharjah Sharjah27272 United Arab Emirates College of Arts and Sciences Abu Dhabi University Abu Dhabi59911 United Arab Emirates Institute for Quantum Science and Engineering Texas A&M University College StationTX77843 United States

Universal quantum gates are crucial for efficient algorithm execution on quantum computers, offering rapid and fault-tolerant manipulations. This paper presents a theoretical framework for realizing a novel entangling universal quantum gate within the circuit quantum electrodynamics (circuit QED) architecture. Our approach involves positioning two SQUIDs qubits within a resonant single-mode microwave cavity field, enabling the implementation of the SQSCZ gate, a fusion of the square root of SWAP ($\sqrt{SWAP}$) and the square root of controlled-Z ($\sqrt{CZ}$) gates. This gate serves as a fundamental building block for constructing universal quantum gates including the controlled-NOT gates. Moreover, the SQSCZ gate operates unitarily, ensuring logical reversibility, and exhibits an entangling power (EP) of 1.5/9. Quantitative analysis reveals an average gate fidelity of $60\%$. To delve deeper into the gate's performance, we conducted quantum process tomography (QPT) analysis by repeating the quantum experiment 11,000 times for each measurement basis on an IBM Quantum's quantum simulator. This rigorous approach yielded a remarkable process fidelity of $96.065616\%$. These findings offer promising implications for future research and applications. © 2024, The Authors. All rights reserved.

关键词： Qubits

Bang-bang preparation of quantum many-body ground states in two dimensions: Optimization of the algorithm with a two-dimensional tensor network

学校读者我要写书评

暂无评论

arXiv 2024年

作者： Zhang, Yintai Dziarmaga, Jacek Jagiellonian University Doctoral School of Exact and Natural Sciences ul. Lojasiewicza 11 Kraków30-348 Poland Jagiellonian University Faculty of Physics Astronomy and Applied Computer Science Institute of Theoretical Physics ul. Lojasiewicza 11 Kraków30-348 Poland Jagiellonian University Mark Kac Center for Complex Systems Research ul. Lojasiewicza 11 Kraków30-348 Poland

A bang-bang (BB) algorithm prepares the ground state of a two-dimensional (2D) quantum many-body Hamiltonian H = H1 + H2 by evolving an initial product state alternating between H1 and H2. We use the neighborhood tensor update to simulate the BB evolution with an infinite pair-entangled projected state (iPEPS). The alternating sequence is optimized with the final energy as a cost function. The energy is calculated with a tangent space power method for the sake of its stability. The method is benchmarked in the 2D transverse field quantum Ising model near its quantum critical point against a ground state obtained by variational optimization of the iPEPS. The optimal BB sequence differs non-perturbatively from a sequence simulating quantum annealing or adiabatic preparation (AP) of the ground state. The optimal BB energy converges with the number of bangs much faster than the optimal AP energy. Copyright © 2024, The Authors. All rights reserved.

关键词： Ground state

Entanglement generation from athermality

学校读者我要写书评

暂无评论

arXiv 2024年

作者： de Oliveira Junior, A. Son, Jeongrak Czartowski, Jakub Ng, Nelly H.Y. Center for Macroscopic Quantum States bigQ Department of Physics Technical University of Denmark Fysikvej 307 Kgs. Lyngby2800 Denmark School of Physical and Mathematical Sciences Nanyang Technological University Singapore637371 Singapore Doctoral School of Exact and Natural Sciences Jagiellonian University Kraków30-348 Poland Faculty of Physics Astronomy and Applied Computer Science Jagiellonian University Kraków30-348 Poland

We investigate the thermodynamic constraints on the pivotal task of entanglement generation using out-of-equilibrium states through a model-independent framework with minimal assumptions. We establish a necessary and sufficient condition for a thermal process to generate bipartite qubit entanglement, starting from an initially separable state. Consequently, we identify the set of system states that cannot be entangled, when no external work is invested. In the regime of infinite temperature, we analytically construct this set;while for finite temperature, we provide a simple criterion to verify whether any given initial state is or is not entanglable. Furthermore, we provide an explicit construction of the future thermal cone of entanglement - the set of entangled states that a given separable state can thermodynamically evolve to. We offer a detailed discussion on the properties of this cone, focusing on the interplay between entanglement and its volumetric properties. We conclude with several key remarks on the generation of entanglement beyond two-qubit systems, and discuss its dynamics in the presence of dissipation. © 2024, CC BY.

关键词： Volumetric analysis

Kolmogorov-Arnold Networks for metal surface defect classification

学校读者我要写书评

暂无评论

arXiv 2025年

作者： Krzywda, Maciej Wermiński, Mariusz Lukasik, Szymon Gandomi, Amir H. AGH University of Krakow Faculty of Physics and Applied Computer Science al. A. Mickiewicza 30 Krakow30-059 Poland AGH University of Krakow Faculty of Metals Engineering and Industrial Computer Science al. A. Mickiewicza 30 Krakow30-059 Poland Systems Research Institute Polish Academy of Sciences ul. Newelska 6 Warsaw01-447 Poland Faculty of Engineering and IT University of Technology Sydney 5 Broadway UltimoNSW2007 Australia Óbuda University Bécsi út 96/B Budapest1034 Hungary NASK National Research Institute ul. Kolska 12 Warsaw01-045 Poland

This paper presents the application of Kolmogorov-Arnold Networks (KAN) in classifying metal surface defects. Specifically, steel surfaces are analyzed to detect defects such as cracks, inclusions, patches, pitted surfaces, and scratches. Drawing on the Kolmogorov-Arnold theorem, KAN provides a novel approach compared to conventional multilayer perceptrons (MLPs), facilitating more efficient function approximation by utilizing spline functions. The results show that KAN networks can achieve better accuracy than convolutional neural networks (CNNs) with fewer parameters, resulting in faster convergence and improved performance in image classification. © 2025, CC BY.

关键词： Surface defects

Efficient Representation of Minimally Entangled Typical Thermal States in two dimensions via Projected Entangled Pair States

学校读者我要写书评

暂无评论

arXiv 2023年

作者： Sinha, Aritra Rams, Marek M. Dziarmaga, Jacek Jagiellonian University Faculty of Physics Astronomy and Applied Computer Science Institute of Theoretical Physics ul. Lojasiewicza 11 Kraków30-348 Poland Max Planck Institute for the Physics of Complex Systems Nöthnitzer Strasse 38 Dresden01187 Germany Jagiellonian University Mark Kac Center for Complex Systems Research ul. Lojasiewicza 11 Kraków30-348 Poland

The Minimally Entangled Typical Thermal States (METTS) are an ensemble of pure states, equivalent to the Gibbs thermal state, designed with an efficient tensor network representation in mind. In this article, we use the Projected Entangled Pair States (PEPS) as their representation on a two-dimensional (2D) lattice. Unlike Matrix Product States (MPS), which for 2D systems are limited by an exponential computational barrier in the lattice size, PEPS provides a more tractable approach. To substantiate the prowess of PEPS in modeling METTS (dubbed as PEPS-METTS), we benchmark it against the purification method in the context of the 2D quantum Ising model at its critical temperature. Our analysis reveals that PEPS-METTS achieves accurate results with significantly lower bond dimensions. We further corroborate this finding in the 2D Fermi-Hubbard model. At a technical level, we introduce an efficient zipper method to obtain PEPS boundary MPS needed to compute expectation values and perform sampling. The imaginary time evolution is done with the neighbourhood tensor update. © 2023, CC BY.

关键词： Ising model

Solution of a problem of thermal stresses in a non-homogeneous thermoelastic infinite medium of isotropic material by finite difference method

学校读者我要写书评

暂无评论

Journal of Ocean Engineering and science 2019年第3期4卷 256-262页

作者： A.M.Farhan A.M.Abd-Alla Moaiad A.Khder Physics Department Faculty of ScienceJazan UniversitySaudi Arabia Physics Department Faculty of ScienceZagzig UniversityEgypt Mathematics Department Faculty of ScienceSohag UniversityEgypt Department of Computer Science Applied Science UniversityBahrain

The present work deals with a new problem of thermoelasticity for an infinitely long and isotropic circular cylinder of temperature dependent physical *** inner and outer curved surfaces of the cylinder are subjected to both the mechanical and thermal boundary conditions.A finite difference model is developed to derive the solution of the problem in which the governing equations are uncoupled linear partial differential *** transient solution at any time can be evaluated directly from the *** order to demonstrate the efficiency of the present model we consider a suitable material and obtain the numerical solution of displacement,temperature,and stresses inside the cylinder for the homogeneous-dependent material properties of the *** results are analyzed with the help of different graphical plots.

关键词： Thermal stress Thermoelasticity Wave propagation Finite difference Method Non-homogeneous medium

physics beyond the Standard Model with the J-PET detector

学校读者我要写书评

暂无评论

arXiv 2021年

作者： Pérez del Río, Elena Faculty of Physics Astronomy and Applied Computer Science Jagiellonian University S. Lojasiewicza 11 Kraków30-348 Poland

The Positronium (Ps) system, a bound state of an electron and a positron, is suitable for testing the predictions of quantum electrodynamics (QED), since its properties can be perturbatively calculated to high accuracy and, unlike the hydrogen system, is not affected by finite size or QCD effects at the current experimental precision level. This makes the Ps atom a good laboratory to test the Fundamental Symmetries of physics and also search for new particles not included in the Standard Model (SM) of physics. On one hand, time reversal (T) and CP symmetry violation have never been observed in pure leptonic systems like the Ps atom, and the current experimental limits for CP and CPT violation in the decays of Ps is currently set at the level of 10−3, while for C violation are at the level of 10−7. These limits are still six and two orders of magnitude lower than the expected precision of 10−9 set by photon-photon interactions. Secondly, experiments searching for invisible decays of the Ps triplet state, the ortho-Positronium (o-Ps), which mainly decays to three photons, are being conducted, since they are sensitive to new physics scenarios, e.g. Mirror Matter (MM), a suitable Dark Matter candidate, proposed to restore parity (P) violation. By performing a high precision measurement of the o-Ps lifetime, the accuracy of the present QED calculations can be tested and a search for the invisible decays of the o-Ps can be performed. These studies are conducted with the novel total-body Positron-Electron Tomograph (PET) scanner at the Jagiellonian University. The J-PET is a large and high precise medical imaging tool, based on the plastic scintillators. It is a high acceptance multi-purpose detector optimized for the detection of photons from positron-electron annihilation and can be used in a broad scope of interdisciplinary investigation, e.g. medical imaging, life-time measurements, quantum entanglement studies with o-Ps, and tests of discrete symmetries. Copyright © 2

关键词： Positrons

Grain Stresses and Critical Resolved Shear Stresses in Duplex Steel Studied Using Neutron Diffraction and Crystallite Group Method

学校读者我要写书评

暂无评论

SSRN

SSRN 2024年

作者： Baczmański, Andrzej Wroński, Sebastian François, Manuel Le Joncour, Léa Panicaud, Benoit Braham, Chedly Ludwik, Aleksandra Wierzbanowski, Krzysztof Klosek, Vincent AGH University of Kraków Faculty of Physics and Applied Computer Science al. Mickiewicza 30 Kraków30-059 Poland 12 rue Marie Curie Troyes10010 France PIMM 151 Bd de l’Hôpital 75013 Paris France CEA Laboratoire Léon Brillouin Gif-sur-Yvette91191 Cedex France

In this work, a new method for determining the critical resolved shear stress (CRSS) and stress concentration in polycrystalline grains was tested and applied to study the elastic-plastic properties of textured duplex steel. The methodology is based on in situ neutron diffraction measurements of lattice strains during tensile loading. The lattice deformations are measured for several hkl reflections and for different sample orientations with respect to the scattering vector. As a result, the full stress tensor for preferred texture orientations in function of applied stress has been determined using the crystallite group method (CGM). Knowing the experimental values of stresses, the stress concentration tensor is determined. The experimental data are then compared with self-consistent model calculations performed for groups of grains corresponding to the measured hkl reflections. The important advance of the proposed methodology consists in the possibility of estimating the CRSSs directly from measurements, without the use of any elastic-plastic *** the research carried out, on the basis of diffraction measurements, the evolution of grain stresses in preferred orientations in the ferritic and austenitic phases of the tested duplex steel was determined. Using these data, the evolution of the resolved shear stress (RSS) was analysed and, for the first time, CRSS values in both duplex phases were obtained directly from the experimental data. The final results also took into account the influence of initial stresses in the obtained material on the determined CRSSs. © 2024, The Authors. All rights reserved.

关键词： Neutron diffraction

STAR-RIS-NOMA Assisted Power Constrained Covert Communication Systems

学校读者我要写书评

暂无评论

IEEE Transactions on Vehicular Technology 2025年

作者： Lei, Yuxin Huang, Gaojian Li, Xingwang Tian, Zhifa Mumtaz, Shahid Asif, Muhammad Henan Polytechnic University School of Physics and Electronic Information Engineering Jiaozuo454003 China City University of Macau Faculty of Data Science 999078 China Henan Polytechnic University School of Surveying and Land Information Engineering Jiaozuo454003 China Henan Polytechnic University School of Physics and Electronic Information Engineering Jiaozuo454099 China Southeast University National Mobile Communications Research Laboratory Nanjing210096 China Silesian University of Technology Department of Applied Informatics Gliwice Poland Department of Engineering Nottingham Trent University United Kingdom Jiangsu University School of Computer Science and Communication Engineering Zhenjiang China

In this paper, a covert communication system assisted by a simultaneously transmitting and reflecting reconfigurable intelligent surface (STAR-RIS) in non-orthogonal multiple access (NOMA) networks is proposed. When the maximum channel power gain from the transmitter in the main network to the users in adjacent networks is smaller than the threshold, the transmitter sends the NOMA signals to the users with the assistance of STAR-RIS. Moreover, channel estimation errors and imperfect successive interference cancellation (SIC) are considered in the system analysis. To characterize the covert performance, the detection error probability (DEP) and the average minimum detection error probability (AMDEP) are first derived. Then, the closed-form solutions of the outage probability (OP) for the users are obtained. Finally, the maximum effective covert rate (ECR) subject to the covertness constraint and non-interruption constraint is studied. The numerical simulation results show that: 1) the detection performance of Willie (warden) deteriorates as the channel estimation errors increase;2) when the transmitter power exceeds the threshold, communication in the main network is interrupted;3) under a certain transmit power, the maximum ECR increases with the increasing of the number of STAR-RIS reflection elements. © 2025 IEEE.

关键词： Channel estimation