Article
Multidisciplinary Sciences
David L. Goodwin, Pranav Singh, Mohammadali Foroozandeh
Summary: Developing fast, robust, and accurate methods for optimal control of quantum systems is crucial in current scientific research. We introduce a fast and accurate algorithm, QOALA, for optimal control of interacting qubit systems, which offers significant speedup compared to existing methods, without sacrificing accuracy.
Article
Physics, Multidisciplinary
Bradley K. Mitchell, Ravi K. Naik, Alexis Morvan, Akel Hashim, John Mark Kreikebaum, Brian Marinelli, Wim Lavrijsen, Kasra Nowrouzi, David I. Santiago, Irfan Siddiqi
Summary: In this study, a tunable ZZ interaction between two fixed-frequency and fixed-coupling transmon qubits is achieved, with adjustable coupling range larger than static coupling and changeable sign of interaction. This interaction is suitable for large quantum processors, with flexible drive frequency choice and resilience to microwave cross talk, enabling the implementation of a controlled phase (CZ) gate with high fidelity.
PHYSICAL REVIEW LETTERS
(2021)
Article
Physics, Applied
A. M. Buryakov, A. V. Gorbatova, P. Y. Avdeev, E. D. Lebedeva, K. A. Brekhov, A. V. Ovchinnikov, N. S. Gusev, E. A. Karashtin, M. V. Sapozhnikov, E. D. Mishina, N. Tiercelin, V. L. Preobrazhensky
Summary: We report on the design of a spintronic emitter based on the Pt/Co structure, which enables control over the polarization of terahertz radiation. By utilizing magnetization rotation at low magnetic fields, we achieved full range rotation of terahertz polarization. The efficiency of the Co/Pt structure in generating terahertz radiation was evaluated, and high energy terahertz pulses were achieved at an appropriate excitation flux.
APPLIED PHYSICS LETTERS
(2023)
Article
Optics
Qingsong Song, Ning Zhang, Jian Liu, Xinyu Qian, Chaoyi Zhang, Yanyan Xue, Yongguang Zhao, Xiaodong Xu, Kheirreddine Lebbou, Jun Xu
Summary: The spectroscopic properties and tunable laser performances of Tm:GdScO3 crystal were studied for different crystallographic axes polarization. The polarized emission spectrum along the b-axis showed the broadest bandwidth among all single Tm3+-doped gain media, indicating the inhomogeneous line broadening and potential for few-optical-cycle pulse generation.
Article
Engineering, Electrical & Electronic
Chen Tang, Amir Khajepour
Summary: The paper proposes a framework of agent-based cooperative controllers to address the scalability and reusability issues in complex vehicular active safety applications. It demonstrates high flexibility in handling changes in vehicle configuration and actuator modeling granularity. Incorporating proprietary subsystems as black-box agent modules expands the coverage of the proposed architecture for advanced vehicular mechatronic systems.
IEEE TRANSACTIONS ON VEHICULAR TECHNOLOGY
(2021)
Article
Multidisciplinary Sciences
Yu Zhou, Zhenxing Zhang, Zelong Yin, Sainan Huai, Xiu Gu, Xiong Xu, Jonathan Allcock, Fuming Liu, Guanglei Xi, Qiaonian Yu, Hualiang Zhang, Mengyu Zhang, Hekang Li, Xiaohui Song, Zhan Wang, Dongning Zheng, Shuoming An, Yarui Zheng, Shengyu Zhang
Summary: The study presents a fast and high-fidelity reset scheme for quantum qubits, achieved by modulating the flux through the qubit to swap with its readout resonator within 34 ns. This approach can effectively deplete the second excited state, has negligible effects on neighboring qubits, and offers a way to entangle the qubit with a single photon for quantum communication applications.
NATURE COMMUNICATIONS
(2021)
Article
Physics, Multidisciplinary
J. Stehlik, D. M. Zajac, D. L. Underwood, T. Phung, J. Blair, S. Carnevale, D. Klaus, G. A. Keefe, A. Carniol, M. Kumph, Matthias Steffen, O. E. Dial
Summary: The article introduces a modified tunable bus architecture suitable for fixed-frequency qubits, achieving high-fidelity 2-qubit operations. Experimental results demonstrate a maximum gate fidelity of 99.85% with good calibration stability over one day.
PHYSICAL REVIEW LETTERS
(2021)
Article
Computer Science, Artificial Intelligence
Yingkang Xie, Qian Ma, Jason Gu, Guopeng Zhou
Summary: This article addresses the problem of adaptive fuzzy event-triggered fixed-time practical tracking control for flexible-joint robot system. Fuzzy logic systems are used due to the difficulties in obtaining the system's nonlinearities. Second-order command filters and a novel compensation system are employed to ensure stability and convergence of the error. The proposed control strategy, based on backstepping technique, guarantees boundedness of the closed-loop system variables and arbitrary small tracking error in fixed time.
IEEE TRANSACTIONS ON FUZZY SYSTEMS
(2023)
Article
Chemistry, Multidisciplinary
Sumit Kumar Pandey, Anchal Srivastava
Summary: This study reported the development of a scalable, reusable, flexible, and functionalized FMWCNT membrane filter with high separation efficiency, permeance, and tensile strength for various applications including wastewater treatment.
Article
Telecommunications
Federico Venturini, Federico Mason, Francesco Pase, Federico Chiariotti, Alberto Testolin, Andrea Zanella, Michele Zorzi
Summary: The study proposed a distributed Reinforcement Learning approach that can scale to larger swarms without modifications. This method relies on UAVs exchanging information through a communication channel to achieve context-awareness and coordination of swarm actions. Experimental results show that the proposed method outperforms traditional look-ahead heuristic methods in handling non-uniform distributions of targets and obstacles.
IEEE TRANSACTIONS ON COGNITIVE COMMUNICATIONS AND NETWORKING
(2021)
Article
Automation & Control Systems
Qinge Xiao, Congbo Li, Ying Tang, Lingling Li
Summary: This paper integrates meta-reinforcement learning of machining parameters to explore optimization model commonalities and apply them to energy-efficient flexible machining. The proposed method improves optimizer generalization by training with multiple machining tasks, representing the first MRL-based adaptive parameter decision for energy-efficient machining. Technologists benefit from reduced decision-making time and improved energy-saving opportunities.
IEEE TRANSACTIONS ON AUTOMATION SCIENCE AND ENGINEERING
(2021)
Article
Optics
Xiaoyue Zhou, Yuchen Lin, Yi Chan, Fu Deng, Jingdi Zhang
Summary: This article reports on a proof-of-principle experiment that generates carrier-envelope phase (CEP)-controllable and frequency-tunable narrowband terahertz (THz) radiation from an air-plasma filament using the beat of a temporally stretched two-color laser pulse sequence. The pulse sequence was prepared by passing the ultrafast laser pulse through a grating stretcher and Michelson interferometer with adjustable inter-arm delay. By partially frequency-doubling and focusing the pulse sequence, an air-plasma filament emitting a THz wave with desired pulse characteristics (center frequency and CEP) was created under coherent control. Numerical simulations were performed to replicate the experimental results and elucidate the complex nonlinear light-matter interaction. This work demonstrates the feasibility of generating coherently controlled narrowband THz waves with high tunability in laser-induced air plasma.
Article
Engineering, Electrical & Electronic
Xu Wu, Wenxin Huang, Yajun Zhao, Can Huang
Summary: This article proposes an efficient model predictive torque control (MPTC) algorithm for induction motors (IM) with flexible duty ratio optimization. The proposed strategy restricts the candidate voltage vectors within a specific area to improve drive performance. Experimental results demonstrate that the proposed algorithm effectively improves steady-state performance and provides faster dynamic response and reduced torque ripple during transient processes.
IEEE JOURNAL OF EMERGING AND SELECTED TOPICS IN POWER ELECTRONICS
(2022)
Article
Automation & Control Systems
Hanul Jung, Sehoon Oh
Summary: This article proposes a data-driven optimization method for integrated control of flexible systems to achieve high-performance automatic control. The characteristics of the integrated control are analyzed and an optimization method based on experimental data is proposed. The effectiveness of the algorithm is confirmed through experiments.
IEEE TRANSACTIONS ON INDUSTRIAL INFORMATICS
(2022)
Article
Engineering, Industrial
Jenny L. C. Diaz, Carlos Ocampo-Martinez
Summary: This work focuses on designing non-centralised control architectures to enhance energy efficiency and flexibility in manufacturing systems. By dividing systems into sub-systems and using distributed optimization techniques, the proposed strategies aim to minimize total energy consumption and achieve closed-loop performance similar to centralized control.
JOURNAL OF MANUFACTURING SYSTEMS
(2021)