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Dephasing Noise Simulation for Coherence-Generating Devices

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arXiv 2024年

作者： Salazar, Roberto Shahbeigi, Fereshte Faculty of Physics Astronomy and Applied Computer Science Jagiellonian University Kraków30-348 Poland International Centre for Theory of Quantum Technologies University of Gdansk Wita Stwosza 63 Gdansk80-308 Poland RCQI Institute of Physics Slovak Academy of Sciences Dúbravská cesta 9 Bratislava84511 Slovakia

Advancing quantum technologies necessitates an in-depth exploration of how operations generate quantum resources and respond to noise. Crucial are gates generating quantum coherence and the challenge of mitigating gate dephasing noise. Precisely, we study the dephasing noise that reduces the coherence-generating power of quantum gates, its simulation, and critical factors. Our primary contribution lies in a theorem characterizing the full set of dephasing noises in gates, adaptable to the simulation by any predefined operation set. In particular, we apply our result to quantify the memory adaptability required for a dephasing noise to arise. Furthermore, we analytically calculate the quantifier for gates acting on qubit systems, thereby fully characterizing this scenario. Next, we show how our results reveal the structure of non-trivial dephasing noise affecting qubit gates and apply them to experimental data, conclusively demonstrating the existence of a gate's dephasing noise, which is irreducible to dephasing of either input or output states. Finally, we show how our study contributes to addressing an open question in the resource theory of coherence generation. Copyright © 2024, The Authors. All rights reserved.

关键词： Qubits

On the Maximum Number of Crossings in Star-Simple Drawings of Kn with No Empty Lens

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Journal of Graph Algorithms and Applications 2022年第3期26卷 381-399页

作者： Felsner, Stefan Hoffmann, Michael Knorr, Kristin Kynčl, Jan Parada, Irene Institute of Mathematics Technische Universität Berlin Germany Department of Computer Science ETH Zürich Switzerland Department of Computer Science Freie Universität Berlin Germany Department of Applied Mathematics Faculty of Mathematics and Physics Charles University Prague Czech Republic Department of Mathematics and Computer Science TU Eindhoven Netherlands

A star-simple drawing of a graph is a drawing in which adjacent edges do not cross. In contrast, there is no restriction on the number of crossings between two independent edges. We forbid empty lenses, i.e., every lens is required to enclose a vertex, and show that with this restriction 3 · (n − 4)! is an upper bound on the number of crossings between two edges of a star-simple drawing of Kn. It follows that n! bounds the total number of crossings in the drawing. This is the first finite upper bound on the number of crossings in star-simple drawings of the complete graph Kn with no empty lens. For a lower bound we construct a star-simple drawing of Kn with no empty lens in which a pair of edges contributes 5n/2−2 crossings. © 2022, Brown University. All rights reserved.

关键词： Stars

6G Technology: Facilitating Creativity in DSS for the Future in IOT 4

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6G Technology: Facilitating Creativity in DSS for the Future...

4th IEEE International Conference on Advance Computing and Innovative Technologies in Engineering, ICACITE 2024

作者： Tewari, Divas Ali, Zahraa Saad Abdula Sabr, Abdul Redha Hussein Al-Attabi, Kassem Mudhafar, Mustafa Saadalwan, Ali Graphic Era Hill University Department of PDP/PC Uttarakhand Bhimtal India National University of Science and Technology College of Technical Engineering DhiQar64001 Iraq Alkunooze University College Computer Engineer Department Basra Iraq The Islamic University College of Technical Engineering Department of Computers Techniques Engineering Najaf Iraq University of Kerbala Faculty of Medical Applied Sciences Department of Medical Physics Karbala56001 Iraq Kut University College Business Administration Department wasit Al kut52001 Iraq

ISBN: (纸本)9798350360165

The need for companies to create and implement Green Business Models has been growing in recent years, both from governments and society at large. Nevertheless, it has been more difficult than expected to reconfigure, build, and develop these models such that they are efficient and environmentally friendly. It is difficult to strike a balance between the monetary and non-monetary components of these models, both for specific companies and their whole value networks. There are security concerns with verifying the veracity of green claims to avoid greenwashing. A more open strategy to business model innovation is required for green business models to succeed in the long run, which in turn calls for better security technology. © 2024 IEEE.

关键词： Green development

Strong-Field Double Ionization in a Three-Electron Atom: Momentum Distribution Analysis

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arXiv 2023年

作者： Efimov, Dmitry K. Maksymov, Artur Zakrzewski, Jakub Prauzner-Bechcicki, Jakub S. Institute of Theoretical Physics Faculty of Fundamental Problems of Technology Wroclaw University of Science and Technology Wroclaw50-370 Poland Institute of Theoretical Physics Faculty of Physics Astronomy and Applied Computer Science Jagiellonian University Stanislawa Lojasiewicza 11 Kraków30-348 Poland Instytut Fizyki Teoretycznej Wydzial Fizyki Astronomii i Informatyki Stosowanej Uniwersytet Jagielloński ulica Stanislawa Lojasiewicza 11 Kraków30-348 Poland Mark Kac Center for Complex Systems Research Jagiellonian University Stanislawa Lojasiewicza 11 Kraków30-348 Poland Jagiellonian University Faculty of Physics Astronomy and Applied Computer Science Marian Smoluchowski Institute of Physics Lojasiewicza 11 Krakow30-348 Poland

We study strong-field double ionization in a three-electron atom by applying a simplified, reduced-dimensionality model with three active electrons. The influence of the spin-induced symmetry of the spatial part of the wavefunction on the final two-photoectron momentum distribution is discussed. We identify partial momentum distributions originating from different sets of spins of outgoing electrons providing in this way a quantum support connection between V-structure and direct ionization typically explained classically. Changes in the momentum distribution with increasing field amplitude obtained in our simplified model are shown to be well-correlated with experimental data known from the literature. The possible relation between the observed dependencies and different ionization mechanisms is discussed. © 2023, CC BY.

关键词： Ionization

Advances in solar energy harvesting integrated by van der Waals graphene heterojunctions

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RSC Advances 2023年第44期13卷 31273-31291页

作者： Le, Top Khac Mai, The-Hung Iqbal, Muhammad Aamir Vernardou, Dimitra Dao, Van-Duong Ponnusamy, Vinoth Kumar Rout, Chandra Sekhar Pham, Phuong V. Faculty of Materials Science and Technology University of Science Ho Chi Minh City700000 Viet Nam Vietnam National University Ho Chi Minh City700000 Viet Nam Department of Physics National Sun Yat-sen University Kaohsiung80424 Taiwan School of Materials Science and Engineering Zhejiang University Hangzhou310027 China Department of Electrical and Computer Engineering School of Engineering Hellenic Mediterranean University Heraklion71410 Greece Faculty of Biotechnology Chemistry and Environmental Engineering Phenikaa University Hanoi100000 Viet Nam Department of Medicinal and Applied Chemistry and Research Center for Precision Environmental Medicine Kaohsiung Medical University Kaohsiung807 Taiwan Department of Medical Research Kaohsiung Medical University Hospital Kaohsiung807 Taiwan Department of Chemistry National Sun Yat-sen University Kaohsiung80424 Taiwan Centre for Nano and Material Sciences Jain University Bangalore562112 India

Graphene has garnered increasing attention for solar energy harvesting owing to its unique features. However, limitations hinder its widespread adoption in solar energy harvesting, comprising the band gapless in the molecular orbital of graphene lattice, its vulnerability to oxidation in oxidative environments, and specific toxic properties that require careful consideration during development. Beyond current challenges, researchers have explored doping graphene with ionic liquids to raise the lifespan of solar cells (SCs). Additionally, they have paid attention to optimizing graphene/Si Schottky junction or Schottky barrier SCs by enhancing the conductivity and work function of graphene, improving silicon's reflectivity, and addressing passivation issues at the surface/interface of graphene/Si, resulting in significant advancements in their power conversion efficiency. Increasing the functional area of graphene-based SCs and designing efficient grid electrodes are also crucial for enhancing carrier collection efficiency. Flaws and contaminants present at the interface between graphene and silicon pose significant challenges. Despite the progress of graphene/Si-based photovoltaic cells still needs to catch up to the efficiency achieved by commercially available Si p-n junction SCs. The low Schottky barrier height, design-related challenges associated with transfer techniques, and high lateral resistivity of graphene contribute to this performance gap. To maximize the effectiveness and robustness of graphene/Si-based photovoltaic cells, appropriate interlayers have been utilized to tune the interface and modulate graphene's functionality. This mini-review will address ongoing research and development endeavors using van der Waals graphene heterojunctions, aiming to overcome the existing limitations and unlock graphene's full potential in solar energy harvesting and smart storage systems. © 2023 The Royal Society of Chemistry.

关键词： Graphene

Giant Exciton Transport in hBN/2D-Perovskite Heterostructures

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arXiv 2025年

作者： Darbari, Sara Bittorf, Paul Multerer, Leon Chahshouri, Fatemeh Darman, Parsa Ruchka, Pavel Giessen, Harald Taleb, Masoud Abdi, Yaser Talebi, Nahid Institute of Experimental and Applied Physics Kiel University Kiel24418 Germany Faculty of Electrical and Computer Engineering Tarbiat Modares University Tehran*** Iran 4th Physics Institute Research Center SCoPE University of Stuttgart Stuttgart70569 Germany Kiel Nano Surface and Interface Science KiNSIS Kiel University Kiel24118 Germany Physics Department University of Tehran Tehran*** Iran

Two-dimensional perovskites, such as Ruddlesden-Popper perovskites, exhibit outstanding optical properties and high exciton binding energies but are highly susceptible to degradation under photo- and electron-beam exposure. To overcome this limitation, we encapsulate the perovskites with mechanically exfoliated hexagonal boron nitride flakes, forming hexagonal boron nitride/perovskite heterostructures. Cathodoluminescence spectroscopy reveals that these heterostructures exhibit significantly reduced electron-beam-induced degradation, enhanced luminescence intensity, a narrower emission bandwidth, and an extended exciton decay time. Moreover, leveraging the scanning capability of our fiber-based cathodoluminescence spectroscopy technique, we demonstrate ultra-long-range exciton transport over distances of approximately 150 micrometers, attributed to exciton-defect coupling. This exciton-defect interaction not only enhances luminescence but also highlights the potential of hexagonal boron nitride/perovskite heterostructures as hybrid van-der-Waals systems with long-range exciton transport and slow radiative decay rates, paving the way for robust and efficient optoelectronic applications. © 2025, CC BY.

关键词： Atomic emission spectroscopy

High-temperature Fatigue and Creep Performance of Additively Manufactured NiCu-based Alloy

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Procedia Structural Integrity 2024年 52卷 143-153页

作者： Ivo Šulák Alice Chlupová Tomáš Záležák Ivo Kuběna Jan-Philipp Roth Katrin Jahns Ulrich Krupp Tomáš Kruml Institute of Physics of Materials Czech Academy of Sciences Žižkova 22 616 00 Brno Czech Republic Faculty of Engineering and Computer Science Osnabrück University of Applied Sciences Albrechtstr. 30 49076 Osnabrück Germany Steel Institute IEHK RWTH Aachen University Intzestraße 1 52072 Aachen Germany

NiCu-based alloys are frequently employed as a key material for heat exchangers and superheated steam systems where the emphasis is put on the resistance against metal dusting and corrosion in harsh environments and, at the same time, excellent mechanical properties at elevated temperatures. The present contribution delivers the experimental results on high-temperature fatigue and creep performance of additively manufactured NiCu-based Alloy 400 and compares it with conventionally produced material. The fatigue tests were performed in symmetrical force control loading in laboratory air at elevated temperatures. Standard constant stress uniaxial creep tests were carried out up to the rupture at applied stresses ranging from 30 to 150 MPa and temperatures between 600–880°C in a protective argon atmosphere. Results indicate inferior fatigue and creep properties of additively manufactured Alloy 400. This detrimental effect of the manufacturing process on mechanical properties can be caused by several factors, including the orientation of the building direction relative to the loading direction, strong texture in 〈011〉 direction, and also by the presence of defects revealed by means of scanning electron microscopy on fracture surfaces of additively manufactured materials.

关键词： Additive manufacturing Alloy 400 fatigue lifetime creep behaviour electron microscopy

Experimental studies of the three nucleon system dynamics in the proton induced deuteron breakup at 108 MeV

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arXiv 2024年

作者： Lobejko, A. Stephan, E. Ciepal, I. Golak, J. Kalantar-Nayestanaki, N. Kistryn, S. Klos, B. Kozela, A. Kulessa, P. Parol, W. Skibiński, R. Skwira-Chalot, I. Szadziński, A. Wilczek, A. Witala, H. Wloch, B. Zejma, J. Institute of Physics University of Silesia ChorzówPL-41500 Poland Institute of Experimental Physics Faculty of Mathematics Physics and informatics University of Gdańsk GdańskPL-80308 Poland Institute of Nuclear Physics PAS KrakówPL-31342 Poland Faculty of Physics Astronomy and Applied Computer Science Jagiellonian University KrakówPL-30348 Poland ESRIG University of Groningen Groningen9747 AA Netherlands Faculty of Physics University of Warsaw WarszawaPL-02093 Poland Université de Bordeaux CNRS LP2I Bordeaux GradignanFR-33170 France

The differential cross sections for the 2H(p,pp)n reaction have been measured for 84 angular configurations of the outgoing protons in the range of polar angles from 13 to 33 degrees with a proton beam of 108 MeV. Data have been collected in the Cyclotron Center Bronowice (CCB) at the Institute of Nuclear physics PAS in Cracow, using the BINA detector setup. Analysis leading to determination of the breakup cross section values is described. Absolute normalization is obtained by normalization to the simultaneously measured 2H(p,d)p scattering *** results are compared to the state-of-the-art theoretical calculations. Global analysis shows significant influence of the Coulomb interaction and small effects of three nucleon force in the studied phase space region. © 2024, CC BY.

关键词： Phase space methods

Prospects for quantum process tomography at high energies

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arXiv 2024年

作者： Altomonte, Clelia Barr, Alan J. Eckstein, Michal Horodecki, Pawel Sakurai, Kazuki Department of Physics King’s College Strand LondonWC2R 2LS United Kingdom Department of Physics University of Oxford OX1 3RH Merton College Keble Road Merton Street OxfordOX1 4JD United Kingdom Institute of Theoretical Physics Faculty of Physics Astronomy and Applied Computer Science Jagiellonian University ul. Lojasiewicza 11 Kraków30–348 Poland Faculty of Applied Physics and Mathematics Gdansk University of Technology Gdansk80-952 Poland National Quantum Information Center Gdansk80-309 Poland Institute of Theoretical Physics Faculty of Physics University of Warsaw Pasteura 5 Warsaw02-093 Poland

In quantum information theory, the evolution of an open quantum system – a unitary evolution followed by a measurement – is described by a quantum channel or, more generally, a quantum instrument. In this work, we formulate spin and flavour measurements in collider experiments as a quantum instrument. We demonstrate that the Choi matrix, which completely determines input-output transitions, can be both theoretically computed from a given model and experimentally reconstructed from a set of final state measurements (quantum state tomography) using varied input states. The reconstruction of the Choi matrix, known as quantum process tomography, offers a powerful new approach for probing potential extensions of the Standard Model within the quantum field theory framework and also provides a fundamental test of quantum mechanics itself. As an example, we outline a quantum process tomography approach applied to the e+e− → tt¯ process at a polarized lepton collider. Copyright © 2024, The Authors. All rights reserved.

关键词： Quantum channel