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Limitations on sharing Bell nonlocality between sequential pairs of observers

Physical Review A 2021年第6期104卷 L060201-L060201页

作者： Shuming Cheng Lijun Liu Travis J. Baker Michael J. W. Hall The Department of Control Science and Engineering Tongji University Shanghai 201804 China Shanghai Institute of Intelligent Science and Technology Tongji University Shanghai 201804 China Institute for Advanced Study Tongji University Shanghai 200092 China College of Mathematics and Computer Science Shanxi Normal University Linfen 041000 China Centre for Quantum Computation and Communication Technology (Australian Research Council) Centre for Quantum Dynamics Griffith University Brisbane QLD 4111 Australia Department of Theoretical Physics Research School of Physics Australian National University Canberra ACT 0200 Australia

We give strong analytic and numerical evidence that, under mild measurement assumptions, two qubits cannot both be recycled to generate Bell nonlocality between multiple independent observers on each side. This is surprising, as under the same assumptions it is possible to recycle just one of the qubits an arbitrarily large number of times [P. J. Brown and R. Colbeck, Phys. Rev. Lett. 125, 090401 (2020)]. We derive corresponding one-sided monogamy relations that rule out two-sided recycling for a wide range of parameters, based on a general tradeoff relation between the strengths and maximum reversibilities of qubit measurements. We also show if the assumptions are relaxed to allow sufficiently biased measurement selections, then there is a narrow range of measurement strengths that allows two-sided recycling for two observers on each side, and propose an experimental test. Our methods may be readily applied to other types of quantum correlations, such as steering and entanglement, and hence to general information protocols involving sequential measurements.

关键词： Nonlocality Quantum correlations in quantum information

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Evaluating Regional Rail Transit Safety: A Matter-Element Analysis Method*

Evaluating Regional Rail Transit Safety: A Matter-Element An...

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International Conference on Intelligent Transportation

作者： Qing LI Ling LIU Wanqiu ZHANG Jun LIU Guangyu BAI Beijing Engineering Technology Research Center of Operation Control Systems for High Speed Railways Beijing National Railway Research & Design Institute of Signal & Communication Beijing China Beijing National Railway Research & Design Institute of Signal & Communication Beijing China

ISBN: (数字)9781728141497

ISBN: (纸本)9781728141503

We propose a comprehensive method based on matter-element analysis for evaluating the safety of regional rail transit systems objectively and quantitatively. Using the main factors affecting the safety of regional rail transit, a safety level evaluation index system is constructed from the perspective of “human-machine-environment-management” and quantitative calculation methods for each index are described. A comprehensive evaluation model for the safety level is established using the matter-element analysis method in extension theory. The model considers expert knowledge and data objectivity and uses an improved entropy weight method to determine index weights. The proposed model can be applied to multi-level evaluation objects. With an evaluation of the whole system or a single index, risk control measures can be enacted appropriately. Using actual operations data from a regional urban metropolis in China, the validity and practicality of the model were verified. The comparison with the actual situation verifies that the proposed model can evaluate the safety level of the network effectively and comprehensively.

关键词： Safety Indexes Rails Meteorology Hazards Rail transportation Maintenance engineering

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Study on the influence of regional rail transit line interconnection operation on capacity

Study on the influence of regional rail transit line interco...

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International Conference on Intelligent Transportation

作者： Ying WANG Ling LIU Zhoufan WANG Jiakang WANG Yunlong WANG Beijing National Railway Research & Design Institute of Signal & Communication Beijing China Beijing Engineering Technology Research Center of Operation Control Systems for High Speed Railways Beijing China Civil Aviation Management Institute of China Beijing China North Automatic Control Technology Institute Taiyuan China

ISBN: (数字)9781728141497

ISBN: (纸本)9781728141503

Interconnection operation of rail transit line has become a key means to address the long-distance and diversified travel demands in the rail transit region. The influencing mechanism of the interconnection operation on the capacity of urban rail transit network is complex. In this study, the operation of off-line train is analyzed after interconnection. The capacity is mainly impacted during the stages of transportation scheduling and rescheduling. Three types of off-line train operation modes, namely, running only one off-line train (M-1), continuously running multiple off-line trains (M-2), and operating off-line and in-line trains at a certain proportional interval (M-3), are studied. The methods to reduce the impact on capacity during transportation planning and operation scheduling are put forward. A suburban railway and an urban rail line in Chengdu-Chongqing area are selected as the research cases to verify our research conclusions. We found that the operation of off-line trains has strict requirements on the departure interval of the line. We further found that the mode M-2 is suitable for the lines with tight capacity, and the mode M-3 is suitable for off-peak periods when the transportation capacity is relatively abundant.

关键词： Rails Transportation Rail transportation Capacity planning Organizations Planning Delays

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Optimal control of linear Gaussian quantum systems via quantum learning control

arXiv

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arXiv 2024年

作者： Liu, Yu-Hong Zeng, Yexiong Tan, Qing-Shou Dong, Daoyi Nori, Franco Liao, Jie-Qiao Key Laboratory of Low-Dimensional Quantum Structures and Quantum Control of Ministry of Education Key Laboratory for Matter Microstructure and Function of Hunan Province Department of Physics Synergetic Innovation Center for Quantum Effects and Applications Hunan Normal University Changsha410081 China Theoretical Quantum Physics Laboratory Cluster for Pioneering Research RIKEN Wakoshi Saitama351-0198 Japan Quantum Computing Center RIKEN Wakoshi Saitama351-0198 Japan Key Laboratory of Hunan Province on Information Photonics and Freespace Optical Communication College of Physics and Electronics Hunan Institute of Science and Technology Yueyang414000 China School of Engineering and Information Technology University of New South Wales CanberraACT2600 Australia Department of Physics The University of Michigan Ann ArborMI48109-1040 United States Institute of Interdisciplinary Studies Hunan Normal University Changsha410081 China

Efficiently controlling linear Gaussian quantum (LGQ) systems is a significant task in both the study of fundamental quantum theory and the development of modern quantum technology. Here, we propose a general quantum-learning-control method for optimally controlling LGQ systems based on the gradient-descent algorithm. Our approach flexibly designs the loss function for diverse tasks by utilizing first- and second-order moments that completely describe the quantum state of LGQ systems. We demonstrate both deep optomechanical cooling and large optomechanical entanglement using this approach. Our approach enables the fast and deep ground-state cooling of a mechanical resonator within a short time, surpassing the limitations of sideband cooling in the continuous-wave driven strong-coupling regime. Furthermore, optomechanical entanglement could be generated remarkably fast and surpass several times the corresponding steady-state entanglement, even when the thermal phonon occupation reaches one hundred. This work will not only broaden the application of quantum learning control, but also open an avenue for optimal control of LGQ systems. Copyright © 2024, The Authors. All rights reserved.

关键词： Cooling

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Root Loci Analysis of a Simple Quasi-Polynomial and Its Use for Relay-Based Parameter Identification of a Delayed Infinite-Dimensional Heat-Exchanger Process

Research Square

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Research Square 2021年

作者： Pekař, Libor Song, Mengjie Padhee, Subhransu Dostálek, Petr Zezulka, František Department of Technical Studies College of Polytechnics Jihlava Tolstého 1556 Jihlava586 01 Czech Republic Department of Automation and Control Engineering Faculty of Applied Informatics Tomas Bata University in Zlín nám. T. G. Masaryka 5555 Zlín760 01 Czech Republic Department of Energy and Power Engineering School of Mechanical Engineering Beijing Institute of Technology Engine East Building 125 Beijing100081 China Department of Electrical and Electronics Engineering Institute of Information Technology Sambalpur University Burla Odisha 769018 India Department of Control and Instrumentation Faculty of Electrical Engineering and Communication Brno University of Technology Technická 3082/12 Královo Pole Brno616 00 Czech Republic

The focus of this contribution is twofold. The first part aims at the rigorous and complete analysis of pole loci of a simple delayed model, the characteristic function of which is represented by a quasi-polynomial with a non-delay and a delay parameter. The derived spectrum constitutes an infinite set, making it a suitable and simple-enough representative of even high-order process dynamics. The second part intends to apply the simple infinite-dimensional model for relay-based parameter identification of a more complex model of a heating-cooling process with heat exchangers. Processes of this type and construction are widely used in industry. The identification procedure has two substantial steps. The first one adopts the simple model with a low computational effort using the saturated relay that provides a more accurate estimation than the standard on/off test. Then, this result is transformed to the estimation of the initial characteristic equation parameters of the complex infinite-dimensional heat-exchanger model using the exact dominant-pole-loci assignment. The benefit of this technique is that multiple model parameters can be estimated under a single relay test. The second step attempts to estimate the remaining model parameters by various numerical optimization techniques and also to enhance all model parameters via the Autotune Variation Plus relay experiment for comparison. Although the obtained unordinary time and frequency domain responses may yield satisfactory results for control tasks, the identified model parameters may not reflect the actual values of process physical quantities. © 2021, CC BY.

关键词： Optimization

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Experimental investigation of evolution of dynamics in short-resonant-cavity DFB laser with optical feedback

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Optics & Laser technology 2025年 191卷

作者： Wenchao Chen Yuanyuan Guo Zhiwei Jia Longsheng Wang Anbang Wang Yuncai Wang Key Laboratory of Advanced Transducers and Intelligent Control System Ministry of Education Taiyuan University of Technology Taiyuan 030024 China College of Physics and Optoelectronics Taiyuan University of Technology Taiyuan 030024 China Key Laboratory of Photonic Technology for Integrated Sensing and Communication Ministry of Education Guangdong University of Technology Guangzhou 510006 China Guangdong Provincial Key Laboratory of Information Photonics Technology Guangdong University of Technology Guangzhou 510006 China Institute of Advanced Photonics Technology & School of Information Engineering Guangdong University of Technology Guangzhou 510006 China

We conducted experiments to investigate the evolution of dynamics in short-resonant-cavity distributed feedback laser subject to optical feedback. Results reveal that the transition of the laser into chaos involves a regular switching between the stable state and quasi-periodic state. When exiting the chaotic state, the laser exhibits a switching between stable state and chaotic state, ultimately evolving into feedback locking. A new dynamic evolution path of the DFB laser has been proposed: stable state → switching between the stable state and quasi-periodic state → quasi-periodic state → chaotic state → switching between stable state and chaotic state → feedback locking. The influences of feedback strength on the duty cycle of quasi-periodic oscillation are examined. Moreover, a mapping of dynamics with respect to feedback strength and bias current is presented.

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Temperature Sensing Characteristics of Surface Acoustic Wave Brillouin Scattering in Optical Microfibers

Temperature Sensing Characteristics of Surface Acoustic Wave...

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Progress in Electromagnetic Research Symposium (PIERS)

作者： Yi Liu Yuanqi Gu Pengfei Chen Rongrong Guo Yao Yao Yajun You Wenjun He Xiu-Jian Chou Key Laboratory of Advanced Transducers and Intelligent Control System Ministry of Education and Shanxi Province Taiyuan University of Technology 79 West Yingze Street Taiyuan China Institute of Optoelectronic Engineering College of Physics and Optoelectronics Taiyuan University of Technology 79 West Yingze Street Taiyuan China Strong Digital Technology Co. Ltd. (Thinvent) Nanchang China Key Laboratory of Instrumentation Science and Dynamic Measurement Ministry of Education North University of China 3 Xueyuan Street Taiyuan China College of Mechatronics Engineering North University of China Taiyuan China Science and Technology on Electronic Test and Measurement Laboratory School of Instrument and Electronics North University of China Taiyuan China

ISBN: (纸本)9781665409889

Abstract-Temperature sensing characteristics of surface acoustic wave Brillouin scattering in 1-1.3 $\mu\mathrm{m}$ diameter optical microfibers are simulated by using the elastodynamic equation including the electrostrictive stress. A multi-peak Brillouin gain spectrum with rather high scattering efficiency is observed. The highest temperature sensitivity of the surface acoustic mode is 0.568 MHz/°C. Meanwhile, the temperature sensitivity of the surface acoustic mode is less affected by fiber diameter changes, ranging from 0.05 to 0.25 MHz/°C/$\mu\mathrm{m}$. It can be found that using SAW BS for temperature sensing would put less stress on manufacturing constraints for optical microfibers. Moreover, the results provide guidance for the further improving the performance of temperature sensing in the microelectronics field.

关键词： Temperature sensors Optical fibers Optical fiber sensors Temperature distribution Sensitivity Surface acoustic waves Microelectronics

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Mandatory Lane Change Strategy in VANET Based on Coordinated Stackelberg Game Model

Mandatory Lane Change Strategy in VANET Based on Coordinated...

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Chinese control and Decision Conference, CCDC

作者： Ding Nan Akira Maria Meng Xianghua Nasibullah Di Wu Department of Computer Science and Technology Dalian University of Technology Dalian P.R. China Electronics and Communication Science Unit Indian Statistical Institute Kolkata India Department of Control Theory and Control Engineering Dalian University of Technology Dalian P.R. China

ISBN: (数字)9781728158556

ISBN: (纸本)9781728158563

Despite the unavailability of intersections and turns, expressway has several lane closures and ramps. Mandatory lane change takes place when the geographical condition requires the vehicles to shift lane, such as, exits, on and off-ramps. Due to a high-speed regulation on the expressway, it is more difficult and riskier to shift lane, therefore better strategies for semi-automation vehicles have to be implemented for the users' safety. This paper studies the efficiency of the Stackelberg based algorithm for safer mandatory lane maneuver, yet still with appropriate speed. The paper also utilizes model predictive controller (MPC) to predict the motions of surrounding vehicles a few time steps in the future to model the probabilities of subject vehicles to shift. Then we consider the costs, MPC and the game to output the best time for subject vehicle to shift. Finally, we simulate the algorithm to determine if it is efficient by comparing it to other existing algorithms and breaking the simulation down to various indicators.

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Pro-UIGAN: Progressive Face Hallucination from Occluded Thumbnails

arXiv

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arXiv 2021年

作者： Zhang, Yang Yu, Xin Lu, Xiaobo Liu, Ping The Key Laboratory of Intelligent Perception and Systems for High-Dimensional Information Ministry of Education School of Computer Science and Engineering Nanjing University of Science and Technology Nanjing210094 China The Australian Institute of Artificial Intelligence University of Technology Sydney UltimoNSW2007 Australia The School of Automation Southeast University Nanjing210096 China Key Laboratory of Measurement and Control of Complex Systems of Engineering Ministry of Education Nanjing210096 China Singapore138634 Singapore

In this paper, we study the task of hallucinating an authentic high-resolution (HR) face from an occluded thumbnail. We propose a multi-stage Progressive Upsampling and Inpainting Generative Adversarial Network, dubbed Pro-UIGAN, which exploits facial geometry priors to replenish and upsample (8×) the occluded and tiny faces (16×16 pixels). Pro-UIGAN iteratively (1) estimates facial geometry priors for low-resolution (LR) faces and (2) acquires non-occluded HR face images under the guidance of the estimated priors. Our multi-stage hallucination network upsamples and inpaints occluded LR faces via a coarse-to-fine fashion, significantly reducing undesirable artifacts and blurriness. Specifically, we design a novel cross-modal attention module for facial priors estimation, in which an input face and its landmark features are formulated as queries and keys, respectively. Such a design encourages joint feature learning across the input facial and landmark features, and deep feature correspondences will be discovered by attention. Thus, facial appearance features and facial geometry priors are learned in a mutually beneficial manner. Extensive experiments show that our Pro-UIGAN attains visually pleasing completed HR faces, thus facilitating downstream tasks, i.e., face alignment, face parsing, face recognition as well as expression classification. Copyright © 2021, The Authors. All rights reserved.

关键词： Generative adversarial networks

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Privacy-aware laser wireless power transfer for aerial multi-access edge computing: A colonel blotto game approach

TechRxiv

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TechRxiv 2021年

作者： Zhang, Long Wang, Yao Min, Minghui Guo, Chao Sharma, Vishal Han, Zhu The School of Information and Electrical Engineering Hebei University of Engineering Handan056038 China The School of Information and Control Engineering China University of Mining and Technology Xuzhou221116 China The Department of Communication Engineering Beijing Singapore Electronics Science and Technology Institute Beijing100070 China The School of Electronics Electrical Engineering and Computer Science Queens University Belfast Northern Ireland United Kingdom The Department of Electrical and Computer Engineering University of Houston HoustonTX77004 United States The Department of Computer Science and Engineering Kyung Hee University Seoul446-701 Korea Republic of

Multi-access edge computing (MEC) has been recently considered in challenging environments lacking available terrestrial infrastructures by extending the computing resources to the air for further enhancing the computation capability of the new aerial user equipment (AUE). Additionally, wireless power transfer (WPT) is a promising solution to prolong the battery lifetime of energy-constrained wireless devices like AUEs. In this paper, we investigate the integration of laser-beamed WPT in the high-altitude platform (HAP) aided MEC systems for the HAP-connected AUEs. By discretizing the three-dimensional coverage space of the HAP, we present a multi-tier tile grid-based spatial structure to provide aerial locations for laser charging. With this setup, we identify a new privacy vulnerability caused by the openness during the air-to-air transmission of WPT signaling messages in the presence of a terrestrial adversary. A privacy-aware laser-powered aerial MEC framework is developed that addresses this vulnerability and enhances the location privacy of AUEs for laser WPT. Specifically, the interaction between the HAP as a defender and the adversary in their tile grid allocation as charging locations to AUEs is formulated as a Colonel Blotto game, which models the competition of the players for limited resources over multiple battlefields for a finite time horizon. Moreover, we derive the mixed-strategy Nash equilibria of the tile grid allocation game for both symmetric and asymmetric tile grids between the defender and the adversary. Simulations results show that the proposed framework significantly outperforms the design baselines with a given privacy protection level in terms of system-wide expected total utilities. © 2021, CC BY.

关键词： Antennas

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