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Quantum Computing via Singlet-Triplet Spin Qubits in Nanowire Double Quantum Dots

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Chinese Physics Letters 2011年第7期28卷 31-34页

作者： xue Peng Department of Physics Southeast UniversityNanjing 211189

We propose a new structure for quantum computing via spin qubits with high *** spin qubit corresponds to two electrons in a nanowire double quantum dot,with the singlet and one of the triplets as the logical qubit *** entangling gate is effected by virtual charge dipole *** include noise to show the feasibility of this scheme under current experimental conditions.

关键词： conditions states quantum

Single metal atom decorated photocatalysts:Progress and challenges

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Nano Research 2021年第4期14卷 934-944页

作者： Lei Zeng Can xue School of materials science and engineering Nanyang Technological University50 Nanyang avenueSingapore 639798Singapore

Photocatalysis has attracted intense attention due to its potential to solve the energy resource problem and environmental *** single metal atom decorated photocatalysts as a rising star become more and more popular because of the unique advantages of superior catalytic activities and ultrahigh atom utilization *** key function of single metal atom catalysts in photocatalytic reactions is boosting surface redox reactions by utilizing photogenerated charges,and has been verified by various spectroscopic and microscopic ***,the activities of the single metal atoms highly depend on the binding environment in the host photocatalyst that affect the adsorption and activation of reactants as well as the reaction energy ***,this mini review summarizes recent progress on single metal atom decorated photocatalysts,and discusses the roles of the single metal atom catalysts in different types of host photocatalysts including organic,carbon-based and inorganic *** remaining challenges and future perspectives on the stability and activities of single atom catalysts in photocatalytic processes are elaborated in the *** believe that this mini review will provide valuable overview on synthetic methods of different single atom photocatalysts for researchers towards future development of highly efficient photocatalysts.

关键词： photocatalysis solar fuels hydrogen generation CO_(2)reduction artificial photosynthesis solar energy conversion

Physiological-physical feature fusion for automatic voice spoofing detection

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frontiers of Computer Science 2023年第2期17卷 157-166页

作者： Junxiao xue Hao ZHOU Research Institute of Artificial Intelligence Zhejiang LabHangzhou 311121China School of Cyber Science and Engineering Zhengzhou UniversityZhengzhou 450002China Henan Key Laboratory of Cyberspace Situation Awareness Zhengzhou 450000China

Biometric speech recognition systems are often subject to various spoofing attacks,the most common of which are speech synthesis and speech conversion *** spoofing attacks can cause the biometric speech recognition system to incorrectly accept these spoofing attacks,which can compromise the security of this *** have made many efforts to address this problem,and the existing studies have used the physical features of speech to identify spoofing ***,recent studies have shown that speech contains a large number of physiological features related to the human *** example,we can determine the speaker's gender,age,mouth shape,and other information by *** by the above researches,we propose a spoofing attack recognition method based on physiological-physical features *** method involves feature extraction,a densely connected convolutional neural network with squeeze and excitation block(SE-DenseNet),and feature fusion *** first extract physiological features in audio from a pretrained convolutional *** we use SE-DenseNet to extract physical *** a dense connection pattern has high parameter efficiency,and squeeze and excitation blocks can enhance the transmission of the ***,we integrate the two features into the classification network to identify the spoofing *** results on the ASVspoof 2019 data set show that our model is effective for voice spoofing *** the logical access scenario,our model improves the tandem decision cost function and equal error rate scores by 5%and 7%,respectively,compared to existing methods.

关键词： spoofing attacks SE-DenseNet physiological feature

Quantum Memory via Wigner Crystals of Polar Molecules

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Chinese Physics Letters 2011年第12期28卷 32-35页

作者： xue Peng Department of Physics Southeast UniversityNanjing 211189

Collective excitations of rotational and spin states of an ensemble of polar molecules as a candidate for a high-fidelity quantum memory are *** dipolar crystals are formed in the high-density limit of cold clouds of polar molecules under one-dimensional trapping *** lifetime of quantum memory is calculated by identifying the dominant decoherence mechanisms,and we estimate their effects on gate operations,when a molecular ensemble qubit is transferred to a superconducting microwave cavity.

关键词： ensemble quantum operations

Analysis of Mode Interaction in Ultra-low frequency Oscillation Based on Trajectory Eigenvalue

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Journal of Modern Power Systems and Clean Energy 2020年第6期8卷 1208-1220页

作者： Yusheng xue Zijun Bin State grid Electric Power Research Institute Nanjing 211106China the School of Electrical Engineering Shandong UniversityJinan 250061China

Complex phenomena such as prolongedly undamped ultra-low frequency oscillation(ULfO)and eigenmode re-excitation are observed in the simulations of hydroelectric power *** are put on nonlinearities and mode interactions,which cannot be analyzed by traditional eigen-analysis *** order to investigate the mechanism of the evolvement of the nonlinear dynamic process in ULfO,this paper proposes a method to analyze the mode interactions ***,a disturbed trajectory is decoupled into a set of time-varying ***,transfer matrices of eigenmodes are extracted along the ***,consecutive sequences of eigenvalues and trajectories of components are formed by a proposed *** on the decoupled components and transfer matrices,the mechanisms of mode interactions and inheritance relationships between eigenmodes are *** causes and developments of the above complex phenomena are revealed by the proposed method in a test two-machine ***,the accuracy of the eigenmode matching technique is verified in the New England system.

关键词： Eigenmode matching hydroelectric power system mode interaction trajectory eigenvalue ultra-low frequency oscillation

Disorder in parity-time symmetric quantum walks

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Chinese Physics B 2022年第1期31卷 69-73页

作者： Peng xue Beijing Computational Science Research Center Beijing 100084China

We experimentally investigate the impact of static disorder and dynamic disorder on the non-unitary dynamics of parity-time(PT)-symmetric quantum *** temporally alternating photon losses in an interferometric network,we realize the passive PT-symmetric quantum dynamics for single *** coin operations allow us to simulate different environmental influences,which result in three different behaviors of quantum walkers:a standard ballistic spread,a diffusive behavior,and a localization,respectively,in a PT-symmetric quantum walk architecture.

关键词： parity-time symmetry quantum walks disorder

An Asynchronous Quasi-Cloud/Edge/Client Collaborative federated Learning Mechanism for fault Diagnosis

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Chinese Journal of Electronics 2021年第5期30卷 969-977页

作者： MA xue WEN Chenglin School of Automation Hangzhou Dianzi University School of Automation Guangdong University of Petrochemical Technology

Although the federated learning method has the ability to balance data and protect data privacy by means of model aggregation, while the existing methods are difficult to achieve the effectiveness of centralized learning under data sharing. The existing federated structure only has a certain degree of confidentiality for data privacy, that is to say, each client can reconstruct a part of the information of other clients based on the model parameters shared between the server and the clients under certain conditions. In order to make the federated learning mechanism more confidential,we breaks the existing mechanism that the parameters between the federated model and the client model are completely shared, and establishes a new asynchronous quasi-cloud/edge/client collaborative federated learning mechanism. We construct a hierarchical multi-level confidential communication network, where the network parameters are shared in a way of quasi-cloud/edge/client coordination without data communication. The cloud and the edges respectively use the sequential Kalman filter algorithm to perform an asynchronous fusion of the network parameters uploaded in their respective fusion centers for the next round of updates; The effectiveness of the proposed algorithm is verified on the data of a type of rotating machinery.

关键词： production engineering computing federated model hierarchical multilevel confidential communication network model aggregation client model sequential Kalman filter Kalman filters client-server systems learning (artificial intelligence) cloud computing centralized learning federated learning method fault diagnosis data privacy

Optimal Control of Unknown Discrete-Time Linear Systems with Additive Noise

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Journal of Systems Science & Complexity 2023年第2期36卷 591-612页

作者： YANg xue LIU Shujun School of Mathematics Sichuan UniversityChengdu 610064China

The optimal control problem with a long run average cost is investigated for unknown linear discrete-time systems with additive *** authors propose a value iteration-based stochastic adaptive dynamic programming(VI-based SADP)algorithm,based on which the optimal controller is *** from the existing relevant work,the algorithm does not need to estimate the expectation(conditional expectation)and variance(conditional variance)of states or other relevant variables,and the convergence of the algorithm can be proved rigorously.A simulation example is given to verify the effectiveness of the proposed approach.

关键词： Discrete-time linear systems optimal control stochastic adaptive dynamic programming

Engineering yolk-shell CuCo_(2)S_(4)@Cu_(2)O Z-scheme nanoreactors for accelerating generation of value-added chemicals and of degradation multi-organic contaminants

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Journal of Materials Science & Technology 2023年第25期156卷 54-63页

作者： xue feng Lei Zhang College of Chemistry Liaoning University66 Chongshan Middle RoadShenyang 110036China

The synthesis of solar-driven chemical value-added products and the degradation of pollutants is a promising approach for sustainable development. However, achieving these works via photocatalysts with efficient charge-separation, photo-absorption is challenging. A yolk-shell CuCo_(2)S_(4)@Cu_(2)O Z-scheme nanoreactor (YS-CuCo_(2)S_(4)@Cu_(2) O-NR) with octahedron Cu_(2)O as the core and tubular CuCo2 S4 as the shell, has been synthesized by regulating composition and morphology. YS-CuCo_(2)S_(4)@Cu_(2)O-NR shows superior photocatalytic activities for producing H_(2) O_(2) collaborates by selective oxidation of benzyl alcohol (BA) to high value-added benzaldehyde (BAD)/utilized fenton-like reaction to degrade multi-pollutants through space-confinement effect, reaching 80% conversion and 99% selectivity of BA, a yield of 12 mM g^(−1) for H_(2)O_(2) and above 90% degradation efficiency for multi-pollutants. A photocatalysis nanoconfinement reactor system is proposed and demonstrated by using yolk-shell to enhance the performance of the chemical reaction. Mechanism studies show that the yolk-shell provides confined space to accelerate redox reaction kinetics;while the inner void promotes light harvesting and keeps yolk Cu_(2) O from deactivation;combined with the Z-scheme charge transfer, engineering Cu^(+) /Cu^(2+) active composition, they are favorable for enhancing the H_(2) O_(2) generation and fenton-like activity. These findings provide new opportunities for application of yolk-shell Z-scheme metal-oxide-based photocatalysts.

关键词： Octahedron yolk-shell structure catalyzer Z-scheme charge transfer H2O_(2)generation Selective oxidation of BA fenton-like reaction