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Fast Universal Entangling Gate for Superconducting Quantum computers

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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

Statistical Guaranted Noisy Tensor Recovery by Fusing Low-Rankness on All Orientations in Frequency-Original Domains

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SSRN

SSRN 2023年

作者： Li, Xiangrui Wei, Dongxu Hu, Xiyuan Zhang, Liming Ding, Weiping Tang, Zhenmin Department of Computer Technology and Engeneering Nanjing University of Science and Technology Nanjing210094 China School of Physics and Electronic Electrical Engineering Huaiyin Normal University Huaiyin223300 China Faculty of Science and Technology University of Macau E11 Avenida da Universidade Taipa223300 China School of Information Science and Technology Nantong University Nantong226019 China

Low-rank tensor recovery faces challenges in accurately defining the low-rankness of a tensor. Most existing definitions typically focus on one domain alone - either the original or frequency domain. Additionally, certain definitions often exhibit limitations in their sensitivity to orientation *** overcome these challenges, we define a novel tensor rank, the Orientation Invariant Hybrid Rank (OIHR). This rank fuses rank information across all orientations in both frequency and original *** its convex approximation, the Orientation Invariant Hybrid Nuclear Norm (OIHNN), we propose a general tensor recovery *** further explore the statistical performance of the estimator based on this model, establishing a deterministic upper bound on the estimation error under generic noise. Furthermore, non-asymptotic upper bounds under Gaussian noise are separately derived for two specific cases: tensor compressive sensing and tensor completion. Finally, we propose the algorithm to solve the model. Extensive experiments on both synthetic and real data are conducted to validate the statistical guarantees and verify the effectiveness of our algorithm. © 2023, The Authors. All rights reserved.

关键词： Tensors

Estimating the Probability of Falling Share Price Below the Minimum Level

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Estimating the Probability of Falling Share Price Below the ...

International Conference on Control, Decision and Information Technologies (CoDIT)

作者： Sergei L. Semakov Faculty of Control and Applied Mathematics Moscow Institute of Physics and Technology Department of Mathematics Moscow Automobile and Road Construction Institute Federal Research Center “Computer Science and Control” of the Russian Academy of Sciences the Russian Federation

A technology is proposed for estimating the probability that a share price will fall below the minimum level. The exact expression is obtained for the required probability under the assumption that the behavior of the share price is described by the well-known model of Samuelson, according to which the relative change in price is the sum of the non-random trend and the Wiener process. The obtained result is qualitatively analyzed for various relations of the problem parameters.

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Raman Signatures of Single Point Defects in Hexagonal Boron Nitride Quantum Emitters

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arXiv 2025年

作者： Cholsuk, Chanaprom Çakan, Aslı Deckert, Volker Suwanna, Sujin Vogl, Tobias Department of Computer Engineering TUM School of Computation Information and Technology Technical University of Munich Munich80333 Germany Munich80799 Germany Institute of Physical Chemistry Friedrich-Schiller University Jena07743 Germany Leibniz Institute of Photonic Technology Jena07745 Germany Abbe Center of Photonics Institute of Applied Physics Friedrich Schiller University Jena Jena07745 Germany Optical and Quantum Physics Laboratory Department of Physics Faculty of Science Mahidol University Bangkok10400 Thailand

Point defects in solid-state quantum systems are vital for enabling single-photon emission at specific wavelengths, making their precise identification essential for advancing applications in quantum technologies. However, pinpointing the microscopic origins of these defects remains a challenge. In this work, we propose Raman spectroscopy as a robust strategy for defect identification. Using density functional theory, we systematically characterize the Raman signatures of 100 defects in hexagonal boron nitride (hBN) spanning periodic groups III to VI, encompassing around 30,000 phonon modes. Our findings reveal that the local atomic environment plays a pivotal role in shaping the Raman lineshape, enabling the narrowing of potential defect candidates. Furthermore, we demonstrate that Raman spectroscopy can differentiate defects based on their spin and charge states as well as strain-induced variations, implying the versatility of this approach. Therefore, this study not only provides a comprehensive theoretical database of Raman spectra for hBN defects but also establishes a novel experiment framework for using tip-enhanced Raman spectroscopy to identify point defects. More broadly, our approach offers a universal method for defect identification in any quantum materials. Copyright © 2025, The Authors. All rights reserved.

关键词： Point defects

Channel nonlocality under decoherence

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arXiv 2024年

作者： Rico, Albert Morán, Moisés Bermejo Shahbeigi, Fereshte Życzkowski, Karol Faculty of Physics Astronomy and Applied Computer Science Institute of Theoretical Physics Jagiellonian University Kraków30-348 Poland Laboratoire d’Information Quantique Université libre de Bruxelles Belgium RCQI Institute of Physics Slovak Academy of Sciences Dúbravská cesta 9 Bratislava84511 Slovakia Center for Theoretical Physics Polish Academy of Science Warszawa02-668 Poland

The implementation of realistic quantum devices requires a solid understanding of the nonlocal resources present in quantum channels, and the effects of decoherence on them. Here we quantify nonlocality of bipartite quantum channels and identify its component resisting the effects of dephasing noise. Despite its classical nature, we demonstrate that the latter plays a relevant role in performing quantum protocols, such as state transformations and quantum coding for noisy communication. In the converse direction, we show that simulating certain stochastic processes with quantum channels undergoing decoherence has a communication advantage with respect to their classical simulation. Copyright © 2024, The Authors. All rights reserved.

关键词： Stochastic systems

Effect of Oxidation of Aged Power Transformer Insulating Oil on UV-Vis Spectra

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Effect of Oxidation of Aged Power Transformer Insulating Oil...

International Conference on Conduction and Breakdown in Dielectric Liquids

作者： Abdellatif K. Rashed Diaa-Eldin A. Mansour A. Rezk Mohsen Ghali Department of Electrical Power and Machines Engineering Faculty of Engineering Tanta University Tanta Egypt Department of Physics Faculty of Sciences Cantabria University Santander Spain Department of Electrical Power Engineering School of Electronics Communication and Computer Engineering Egypt-Japan University of Science and Technology Alexandria Egypt Department of Physics Institute of Basic and Applied Science Egypt-Japan University of Science and Technology Alexandria Egypt Physics Department Faculty of Science Kafrelsheikh University Kafrelsheikh Egypt

Optical spectroscopy is a major rising condition monitoring tool used to assess the status of the insulating oil in power transformer with a non-destructive approach. Accelerated thermal ageing studies have been discussed considering the effect of temperature on the oil condition. These studies didn't perfectly reflect what is happening in a real in-service power transformer due to the absence of copper catalyst in the ageing process. This paper discusses the effect of oxidation for a more precise simulation of the in-service ageing process of insulating oil. The optical results when copper catalyst is included in the accelerated thermal ageing process are compared with previously obtained results of accelerated thermal ageing to deduce the change that took place in the UV-Vis spectra. Dielectric dissipation factor is assessed to correlate between the optical spectra and transformer oil characteristic parameters. Dissolved decay products were calculated for the samples containing copper catalyst with the same ageing days compared to only thermally accelerated aged samples without the addition of copper catalyst. Dissolved decay products were correlated to both ageing days and dielectric dissipation factor. It was found that the copper catalyst caused a great difference in the obtained UV-Vis spectra.

关键词： Integrated optics Oils Catalysts Accelerated aging Oil insulation Oxidation Dielectrics

Machine Learning based Beamwidth Adaptation for mmWave Vehicular Communications 16

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Machine Learning based Beamwidth Adaptation for mmWave Vehic...

16th IEEE Malaysia International Conference on Communication, MICC 2023

作者： Manic, Setinder Foh, Chuan Heng Kose, Abdulkadir Lee, Haeyoung Leow, Chee Yen Chatzimisios, Periklis Moessner, Klaus Suthaputchakun, Chakkaphong University of Surrey 5GIC & 6GIC Guildford United Kingdom Abdullah Gul University Department of Computer Engineering Kayseri Turkey School of Physics Engineering and Computer Science University of Hertfordshire Hatfield United Kingdom Universiti Teknologi Malaysia Wireless Communication Centre Johor Malaysia International Hellenic University Department of Information and Electronic Systems Engineering Thessaloniki Greece Technical University Faculty of Electronics and Information Technology Chemnitz Germany Bangkok University Electrical and Computer Engineering Department Khlong Nueng Thailand

ISBN: (纸本)9798350304343

The incorporation of mmWave technology in vehicular networks has unlocked a realm of possibilities, propelling the advancement of autonomous vehicles, enhancing interconnectedness, and facilitating communication for intelligent transportation systems (ITS). Despite these strides in connectivity, challenges such as high path-loss have arisen, impacting existing beam management procedures. This work aims to address this issue by improving beam management techniques, specifically focusing on enhancing the service time between vehicles and base stations through adaptive mmWave beamwidth adjustments, accomplished using a Contextual Multi-Armed Bandit Algorithm. By leveraging various conditions to train the ML agent of the Contextual Multi-Armed Bandit Algorithm, it seeks to learn about vehicle mobility profiles and optimize the usage of different antenna beamwidth settings to maximize seamless connection time. The extensive simulation results showcase the effectiveness of an adaptive beamwidth for mobility profiles, extending the connection time a vehicle experiences with a base station when compared to the existing strategies. © 2023 IEEE.

关键词： Base stations

Certifying nonlocal properties of noisy quantum operations

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arXiv 2024年

作者： Rico, Albert Morán, Moisés Bermejo Shahbeigi, Fereshte Zyczkowski, Karol Faculty of Physics Astronomy and Applied Computer Science Institute of Theoretical Physics Jagiellonian University Kraków30-348 Poland Laboratoire d'Information Quantique Université libre de Bruxelles Belgium RCQI Institute of Physics Slovak Academy of Sciences Dúbravská cesta 9 Bratislava84511 Slovakia Center for Theoretical Physics Polish Academy of Science Warszawa02-668 Poland

We provide a unified framework to certify nonlocal properties of quantum channels from the correlations obtained in measurement protocols. Our approach gathers and extends fully- and semidevice independent methods for this purpose. We study the effect of different models of dephasing noise, some of which are shown to generate nonlocality and entanglement in special cases. In the extreme case of complete dephasing, the measurement protocols discussed yield particularly simple tests to certify nonlocality. These are based on the relations between bipartite quantum channels and their classical analogs: bipartite stochastic matrices defining conditional distributions. Copyright © 2024, The Authors. All rights reserved.

关键词： Stochastic systems

The LHCb VELO Upgrade Module Construction

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arXiv 2024年

作者： Akiba, K. Alexander, M. Bertella, C. Biolchini, A. Bitadze, A. Bogdanova, G. Borghi, S. Bowcock, T.J.V. Bridges, K. Brock, M. Burke, A.T. Buytaert, J. Byczynski, W. Carroll, J. Coco, V. Collins, P. Davis, A. Francisco, O. De Aguiar De Bruyn, K. De Capua, S. De Roo, K. Doherty, F. Douglas, L. Dufour, L. Dumps, R. Dutta, D. Eklund, L. Elvin, A. Farry, S. Prieto, A. Fernandez Lima, V. Franco Freestone, J. Fuzipeg, C. Galati, M.D. Torreira, A. Gallas Geertsema, R.E. Gersabeck, E. Gersabeck, M. Grant, F. Halewood-Leagas, T. Hennessy, K. Hulsbergen, W. Hutchcroft, D. Hynds, D. Jans, E. John, D. John, M. Jurik, N. Ketel, T. Klaver, S. Kopciewicz, P. Kostiuk, I. Kraan, M. Langstaff, M. Latham, T. Leflat, A. Cid, E. Lemos Lukashenko, V. Merk, M. Milovanovic, M. Monk, M. Murray, D. Nasteva, I. Oblakowska-Mucha, A. Pajero, T. Parkes, C. Alvarez, A. Pazos Trigo, E. Perez Perry, M. Reiss, F. Rinnert, K. Rodriguez, E. Rodriguez Rovekamp, J. Sanders, F. Smead, L.G. Scantlebury Schiller, M. Shears, T. Smith, N.A. Snoch, A. Švihra, P. Szumlak, T. van Beuzekom, M. van Overbeek, M. Regueiro, P. Vazquez Volkov, V. Wormald, M. Zunica, G. Rio de Janeiro Brazil Nikhef National Institute for Subatomic Physics Amsterdam Netherlands Nikhef National Institute for Subatomic Physics VU University Amsterdam Amsterdam Netherlands AGH - University of Science and Technology Faculty of Physics and Applied Computer Science Kraków Poland Affiliated with an institute covered by a cooperation agreement with CERN Switzerland Universidade de Santiago de Compostela Santiago de Compostela Spain Geneva Switzerland Department of Physics University of Warwick Coventry United Kingdom School of Physics and Astronomy University of Glasgow Glasgow United Kingdom Oliver Lodge Laboratory University of Liverpool Liverpool United Kingdom Department of Physics and Astronomy University of Manchester Manchester United Kingdom Department of Physics University of Oxford Oxford United Kingdom Van Swinderen Institute University of Groningen Groningen Netherlands Department of Physics and Astronomy Uppsala University Uppsala Sweden

The LHCb detector has undergone a major upgrade for LHC Run 3. This Upgrade I detector facilitates operation at higher luminosity and utilises full-detector information at the LHC collision rate, critically including the use of vertex information. A new vertex locator system, the VELO Upgrade, has been constructed. The core element of the new VELO are the double-sided pixelated hybrid silicon detector modules which operate in vacuum close to the LHC beam in a high radiation environment. The construction and quality assurance tests of these modules are described in this paper. The modules incorporate 200 µm thick, n-on-p silicon sensors bump-bonded to 130 nm technology ASICs. These are attached with high precision to a silicon microchannel substrate that uses evaporative CO2 cooling. The ASICs are controlled and read out with flexible printed circuits that are glued to the substrate and wire-bonded to the chips. The mechanical support of the module is given by a carbon fibre plate, two carbon fibre rods and an aluminium plate. The sensor attachment was achieved with an average precision of 21 µm, more than 99.5% of all pixels are fully functional, and a thermal figure of merit of 3 Kcm2W−1 was achieved. The production of the modules was successfully completed in 2021, with the final assembly and installation completed in time for data taking in 2022. © 2024, CC BY.

关键词： Substrates