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Realization of the iSWAP-like gate among the superconducting qutrits

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Chinese Physics B 2023年第2期32卷 117-122页

作者：许鹏张然赵生妹 institute of signal processing and transmission Nanjing University of Posts and TelecommunicationsNanjing 210003China

High-dimensional quantum systems, such as qutrits(quantum three-level systems), have multiple accessible energy levels beyond the two-level qubits. Therefore, qutrits can offer a larger state space to improve the efficiency of quantum computation. Here, we demonstrate a high-fidelity iSWAP-like gate operation on a frequency-tunable superconducting qutrits system. The superconducting quantum system consists of two qutrits that are coupled via a resonator with fixed qutrit-resonator coupling strengths. Through designing the frequency pulse profile and optimizing the parameter values,the gate error can be suppressed below 1.5 × 10^(-3). To bear out the feasibility of the proposal, we have conducted our study with experimentally accessible parameters. As the resonator can mediate the interaction between the irrelevant qutrits, the presented approach can also be used to couple multiple qutrits together, providing a good platform for quantum information processing.

关键词： circuit quantum electrodynamics(circuit QED) superconducting qutrit iSWAP-like gate

Feedback Quantum Neuron and Its Application

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Feedback Quantum Neuron and Its Application

COOPERATIVE WIDEBAND SPECTRUM SENSING BASED ON SEQUENTIAL COMPRESSED SENSING

2005 International Conference on Neural Networks and Brain(ICNN&B’05)

作者： Fei Li Shengmei Zhao Baoyu Zheng institute of signal and Information processing nanjing university of posts and telecommunications

ISBN: (纸本)0780394224;9780780394223

＜正＞A model of feedback quantum neuron（FQN） is proposed.A novel multi-user detector based on feedback quantum neuron and quantum register is *** analysis is given to the theoretical basis and practical performance of the proposed *** simulation results show that the proposed detector has more powerful properties both in bit error rate and near-far resistance than Hopfield neural network based detector.A multi-user detector based on improved FQN is also proposed and the simulation results have shown that the improved FQN multi-user detector is obviously superior to the FQN multi-user *** performance is close to the optimum multi-user detector.

关键词： Neurofeedback Neurons Detectors Quantum computing Multiuser detection Artificial neural networks signal processing Hopfield neural networks Information processing Electronic mail

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cnki会议

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Journal of Electronics(China) 2011年第3期28卷 313-319页

作者： Gu Bin Yang Zhen Hu Haifeng institute of signal processing and transmission Nanjing University of Posts and Telecommunications Nanjing 210003 China Key Lab of Broadband Wireless Communication and Sensor Network Technology Ministry of Education Nanjing University of Posts and Telecommunications Nanjing 210003 China

Compressed sensing offers a new wideband spectrum sensing scheme in Cognitive Radio (CR). A major challenge of this scheme is how to determinate the required measurements while the signal sparsity is not known a priori. This paper presents a cooperative sensing scheme based on se-quential compressed sensing where sequential measurements are collected from the analog-to-information converters. A novel cooperative compressed sensing recovery algorithm named Simul-taneous Sparsity Adaptive Matching Pursuit (SSAMP) is utilized for sequential compressed sensing in order to estimate the reconstruction errors and determinate the minimal number of required meas-urements. Once the fusion center obtains enough measurements, the reconstruction spectrum sparse vectors are then used to make a decision on spectrum occupancy. Simulations corroborate the effec-tiveness of the estimation and sensing performance of our cooperative scheme. Meanwhile, the per-formance of SSAMP and Simultaneous Orthogonal Matching Pursuit (SOMP) is evaluated by Mean-Square estimation Errors (MSE) and sensing time.

关键词： Cognitive Radio (CR) Wideband spectrum sensing Sequential compressed sensing Matching pursuit

MULTI-CHANNEL transmission STRATEGY FOR DYNAMIC SPECTRUM ACCESS

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Journal of Electronics(China) 2010年第3期27卷 345-352页

作者： Wu Yingxiao Yang Zhen Huaxin Consulting Co. Ltd Hangzhou 310014 China institute of signal processing and transmission Nanjing University of Posts and Telecommunications Nanjing 210003 China

Cognitive radio is a promising technology that deals with the scarcity of radio spectrum. In this paper, we propose a new multi-channel transmission strategy for dynamic spectrum access in cognitive radio network. Starting with the model of spectrum activities, we present the multi-channel transmission strategy which has primary user's protection mechanism to improve the spectrum efficiency and study its performance under perfect and imperfect sensing. Numerical example results reveal that the performance of the proposed strategy has the superiority with respect to capacity performance of cognitive users and the protection of primary users.

关键词： transmission strategy Dynamic spectrum access Multiple channels

OPTIMAL POWER ALLOCATION WITH AF AND SDF STRATEGIES IN DUAL-HOP COOPERATIVE MIMO NETWORKS

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Journal of Electronics(China) 2010年第3期27卷 328-339页

作者： Xu Xiaorong Zheng Baoyu Zhang Jianwu institute of signal processing and transmission Nanjing University of Posts and Telecommunications Nanjing 210003 China College of Telecommunication Engineering Hangzhou Dianzi University Hangzhou 310018 China

Dual-hop cooperative Multiple-Input Multiple-Output (MIMO) network with multi-relay cooperative communication is introduced. Power allocation problem with Amplify-and-Forward (AF) and Selective Decode-and-Forward (SDF) strategies in multi-node scenario are formulated and solved respectively. Optimal power allocation schemes that maximize system capacity with AF strategy are presented. In addition, optimal power allocation methods that minimize asymptotic Symbol Error Rate (SER) with SDF cooperative protocol in multi-node scenario are also proposed. Furthermore, performance comparisons are provided in terms of system capacity and approximate SER. Numerical and simulation results confirm our theoretical analysis. It is revealed that, maximum system capacity could be obtained when powers are allocated optimally with AF protocol, while minimization of system's SER could also be achieved with optimum power allocation in SDF strategy. In multi-node scenario, those optimal power allocation algorithms are superior to conventional equal power allocation schemes.

关键词： Dual-hop cooperative Multiple-Input Multiple-Output (MIMO) network Optimal power allocation Amplify-and-Forward (AF) Selective Decode-and-Forward (SDF) System capacity Asymptotic Symbol Error Rate (SER)

EFFICIENT DESIGN OF ANTI-JAMMING RATELESS CODING IN COGNITIVE OFDM

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Journal of Electronics(China) 2010年第6期27卷 781-789页

作者： Xu Xiaorong Zhang Jianwu Zheng Baoyu Yan Junrong College of Telecommunication Engineering Hangzhou Dianzi University Hangzhou 310018 China institute of signal processing and transmission Nanjing University of Posts and Telecommunications Nanjing 210003 China

Efficient anti-jamming rateless coding based on cognitive Orthogonal Frequency Division Multiplexing (OFDM) modulation in Cognitive Radio Network (CRN) is mainly discussed. Rateless coding with small redundancy and low complexity is presented, and the optimal design methods of building rateless codes are also proposed. In CRN, anti-jamming rateless coding could recover the lost packets in parallel channels of cognitive OFDM, thus it protects Secondary Users (SUs) from the in-terference by Primary Users (PUs) efficiently. Frame Error Rate (FER) and throughput performance of SU employing anti-jamming rateless coding are analyzed in detail. Performance comparison between rateless coding and piecewise coding are also presented. It is shown that, anti-jamming rateless coding provides low FER and Word Error Rate (WER) performance with uniform sub-channel selection. Meanwhile, it is also verified that, in higher jamming rate and longer code redundancy scenario, rateless coding method could achieve better FER and throughput performance than another anti-jamming coding schemes.

关键词： Anti-jamming rateless coding Cognitive Orthogonal Frequency Division Multiplexing (OFDM) Frame Error Rate (FER) Word Error Rate (WER) Throughput performance

COLLABORATIVE TRACKING VIA PARTICLE FILTER IN WIRELESS SENSOR NETWORKS

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Journal of Electronics(China) 2008年第3期25卷 311-318页

作者： Yan Zhenya Zheng Baoyu Xu Li Li Shitang institute of signal processing and transmission Nanjing University of Posts and Telecommunications Nanjing 210003 China School of Mathematics ＆ Computer Science Fujian Normal University Fuzhou 350007 China

Target tracking is one of the main applications of wireless sensor networks. Optimized computation and energy dissipation are critical requirements to save the limited resource of the sensor nodes. A framework and analysis for collaborative tracking via particle filter are presented in this paper. Collaborative tracking is implemented through sensor selection, and results of tracking are propagated among sensor nodes. In order to save communication resources, a new Gaussian sum particle filter, called Gaussian sum quasi particle filter, to perform the target tracking is presented, in which only mean and covariance of mixands need to be communicated. Based on the Gaussian sum quasi particle filter, a sensor selection criterion is proposed, which is computationally much simpler than other sensor selection criterions. Simulation results show that the proposed method works well for target tracking.

关键词： Collaborative tracking Wireless sensor network Sensor selection Particle filter

ADAPTIVE MODULATION AND POWER CONTROL FOR THROUGHPUT ENHANCEMENT IN COGNITIVE RADIOS

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Journal of Electronics(China) 2008年第1期25卷 65-69页

作者： Cheng Shilun Yang Zhen Zhang Hui institute of signal processing and transmission Nanjing University of Posts and Telecommunications Nanjing 210003 China Image and Image Communication Lab of Jiangsu Province Nanjing 210003 China

To regulate the transmit-power and enhance the total throughput, a novel Transmit Power Control Game (TPCG) algorithm and an adaptive Modulation TPCG (M-TPCG) algorithm which combine bandwidth allocation, adaptive modulation and transmit-power control based on Space Time Block Coding (STBC) OFDM-CDMA system are designed and a cross-layer framework of database sharing is proposed. Simulation results show that the TPCG algorithm can regulate their transmitter powers and enhance the total throughput effectively, M-TPCG algorithm can achieve maximal system throughput. The performance of the cognitive radio system is improved obviously.

关键词： Cognitive radio Adaptive modulation Cross-layer Power control

Recognition of Continuous Digits by Quantum Neural Networks

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The Journal of China Universities of posts and telecommunications 2003年第1期10卷 29-33页

作者： LI Fei, ZHAO Sheng-mei, ZHENG Bao-yu (institute of signal & Information processing, nanjing university of posts and telecommunications, nanjing 210003, P.R. China) institute of signal & Information processing Nanjing University of Posts and Telecommunications Nanjing 210003

This paper describes a new kind of neural network-Quantum Neural Network(QNN) and its application to recognition of continuous digits. QNN combines the advantages of neuralmodeling and fuzzy theoretic principles . Experiment results show that more than 15 percent errorreduction is achieved on a speaker-independent continuous digits recognition task compared with BPnetworks.

关键词： quantum neural net-work quantum neuron speech recognition