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Quantum sensing of supersensitivity for the Ohmic quantum reservoir

Physical Review A 2022年第3期106卷 032602-032602页

作者： Qing-Shou Tan Wei Wu Lan Xu Jing Liu Le-Man Kuang Key Laboratory of Hunan Province on Information Photonics and Freespace Optical Communication College of Physics and Electronics Hunan Institute of Science and Technology Yueyang 414000 China Key Laboratory of Theoretical Physics of Gansu Province and Lanzhou Center for Theoretical Physics Lanzhou University Lanzhou 730000 China School of Physics and Chemistry Hunan First Normal University Changsha 410205 China MOE Key Laboratory of Fundamental Physical Quantities Measurement National Precise Gravity Measurement Facility School of Physics Huazhong University of Science and Technology Wuhan 430074 China Key Laboratory of Low-Dimensional Quantum Structures and Quantum Control of Ministry of Education Department of Physics and Synergetic Innovation Center for Quantum Effects and Applications Hunan Normal University Changsha 410081 China Synergetic Innovation Academy for Quantum Science and Technology Zhengzhou University of Light Industry Zhengzhou 450002 China

We propose an approach to implement a supersensitive estimation of the key parameters of the Ohmic-family spectral density with coherent spin states as the quantum sensor. This method can dramatically improve the estimation precision of the reservoir coupling strength as well as the cutoff frequency of the spectral density, by using both the number of spins N and encoding time t as effective resources. The quantum Fisher information indicates that the estimation sensitivity of the spectral density can surpass the shot-noise limit for all the sub-Ohmic, Ohmic, and super-Ohmic reservoirs. In particular, for super-Ohmic reservoirs, the precision can achieve a scaling ∝1/(Nt). We also present the measurement scheme which can saturate the quantum Cramér-Rao bound.

关键词： Quantum metrology Quantum sensing Dynamical systems Hamiltonian systems information theory

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A Tutorial on Movable Antennas for Wireless Networks

arXiv

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arXiv 2025年

作者： Zhu, Lipeng Ma, Wenyan Mei, Weidong Zeng, Yong Wu, Qingqing Ning, Boyu Xiao, Zhenyu Shao, Xiaodan Zhang, Jun Zhang, Rui Department of Electrical and Computer Engineering National University of Singapore Singapore117583 Singapore Chengdu611731 China National Mobile Communications Research Laboratory Frontiers Science Center for Mobile Information Communication and Security Southeast University Nanjing210096 China Purple Mountain Laboratories Nanjing211111 China Department of Electronic Engineering Shanghai Jiao Tong University Shanghai200240 China School of Electronic and Information Engineering Beihang University Beijing100191 China Department of Electrical and Computer Engineering University of Waterloo WaterlooONN2L 3G1 Canada State Key Laboratory of CNS/ATM MIIT Key Laboratory of Complex-field Intelligent Sensing Beijing Institute of Technology Beijing100081 China School of Science and Engineering Shenzhen Research Institute of Big Data The Chinese University of Hong Kong Guangdong Shenzhen518172 China

Movable antenna (MA) has been recognized as a promising technology to enhance the performance of wireless communication and sensing by enabling antenna movement. Such a significant paradigm shift from conventional fixed antennas (FAs) to MAs offers tremendous new opportunities towards realizing more versatile, adaptive and efficient next-generation wireless networks such as 6G. In this paper, we provide a comprehensive tutorial on the fundamentals and advancements in the area of MA-empowered wireless networks. First, we overview the historical development and contemporary applications of MA technologies. Next, to characterize the continuous variation in wireless channels with respect to antenna position and/or orientation, we present new field-response channel models tailored for MAs, which are applicable to narrowband and wideband systems as well as far-field and near-field propagation conditions. Subsequently, we review the state-of-the-art architectures for implementing MAs and discuss their practical constraints. A general optimization framework is then formulated to fully exploit the spatial degrees of freedom (DoFs) in antenna movement for performance enhancement in wireless systems. In particular, we delve into two major design issues for MA systems. First, we address the intricate antenna movement optimization problem for various communication and/or sensing systems to maximize the performance gains achievable by MAs. Second, we deal with the challenging channel acquisition issue in MA systems for reconstructing the channel mapping between arbitrary antenna positions inside the transmitter and receiver regions. Moreover, we show existing prototypes developed for MA-aided communication/sensing and the experimental results based on them. Finally, the extension of MA design to other wireless systems and its synergy with other emerging wireless technologies are discussed. We also highlight promising research directions in this area to inspire future investigatio

关键词： Antenna arrays

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Performance Analysis of Reconfigurable Intelligent Surface Assisted Two-Way NOMA Networks

arXiv

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arXiv 2022年

作者： Liu, Ziwei Yue, Xinwei Zhang, Chao Liu, Yuanwei Yao, Yuanyuan Wang, Yafei Ding, Zhiguo The Key Laboratory of Modern Measurement & Control Technology Ministry of Education and also The School of Information and Communication Engineering Beijing Information Science and Technology University Beijing100101 China The School of Electronic Engineering and Computer Science Queen Mary University of London LondonE1 4NS United Kingdom The Department of Electrical Engineering Princeton University Princeton United States The School of Electrical and Electronic Engineering The University of Manchester Manchester United Kingdom

This paper investigates the performance of reconfigurable intelligent surface assisted two-way non-orthogonal multiple access (RIS-TW-NOMA) networks, where a pair of users exchange their information through a RIS. The influence of imperfect successive interference cancellation on RIS-TW-NOMA is taken into account. To evaluate the potential performance of RIS-TW-NOMA, we derive the exact and asymptotic expressions of outage probability and ergodic rate for a pair of users. Based on the analytical results, the diversity orders and high signal-to-noise ratio (SNR) slopes are obtained in the high SNR regime, which are closely related to the number of RIS elements. Additionally, we analyze the system throughput and energy efficiency of RIS-TW-NOMA networks in both delay-limited and delay-tolerant transmission modes. Numerical results indicate that: 1) The outage behaviors and ergodic rate of RIS-TW-NOMA are superior to that of RIS-TW-OMA and two-way relay OMA (TWR-OMA);2) As the number of RIS elements increases, the RIS-TW-NOMA networks are capable of achieving the enhanced outage performance;and 3) By comparing with RIS-TW-OMA and TWR-OMA networks, the energy efficiency and system throughput of RIS-TW-NOMA has obvious advantages. © 2022, CC BY-NC-ND.

关键词： Energy efficiency

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Joint Association, Beamforming, and Resource Allocation for Multi-IRS Enabled MU-MISO Systems With RSMA

arXiv

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arXiv 2024年

作者： Wang, Chunjie Zhang, Xuhui Xing, Huijun Xue, Liang Wang, Shuqiang Shen, Yanyan Yang, Bo Guan, Xinping Shenzhen Institute of Advanced Technology Chinese Academy of Sciences Shenzhen518055 China School of Information and Electrical Engineering Hebei University of Engineering Handan056038 China Hebei Key Laboratory of Security and Protection Information Sensing and Processing Handan056038 China Shenzhen Future Network of Intelligence Institute The School of Science and Engineering The Guangdong Provincial Key Laboratory of Future Networks of Intelligence The Chinese University of Hong Kong Guangdong Shenzhen518172 China Department of Electrical and Electronic Engineering Imperial College London LondonSW7 2AZ United Kingdom Shenzhen Future Network of Intelligence Institute The Guangdong Provincial Key Laboratory of Future Networks of Intelligence The Chinese University of Hong Kong Guangdong Shenzhen518172 China Department of Automation The Key Laboratory of System Control and Information Processing Ministry of Education Shanghai Jiao Tong University Shanghai200240 China

Intelligent reflecting surface (IRS) and rate-splitting multiple access (RSMA) technologies are at the forefront of enhancing spectrum and energy efficiency in the next generation multi-antenna communication systems. This paper explores a RSMA system with multiple IRSs, and proposes two purpose-driven scheduling schemes, i.e., the exhaustive IRS-aided (EIA) and opportunistic IRS-aided (OIA) schemes. The aim is to optimize the system weighted energy efficiency (EE) under the above two schemes, respectively. Specifically, the Dinkelbach, branch and bound, successive convex approximation, and the semidefinite relaxation methods are exploited within the alternating optimization framework to obtain effective solutions to the considered problems. The numerical findings indicate that the EIA scheme exhibits better performance compared to the OIA scheme in diverse scenarios when considering the weighted EE, and the proposed algorithm demonstrates superior performance in comparison to the baseline algorithms. Copyright © 2024, The Authors. All rights reserved.

关键词： Beamforming

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ReRe: A Lightweight Real-time Ready-to-Go Anomaly Detection Approach for Time Series

arXiv

引用

arXiv 2020年

作者： Lee, Ming-Chang Lin, Jia-Chun Gran, Ernst Gunnar Department of Information Security and Communication Technology Norwegian University of Science and Technology Gjøvik Norway Simula Research Laboratory Fornebu Norway

Anomaly detection is an active research topic in many different fields such as intrusion detection, network monitoring, system health monitoring, IoT healthcare, etc. However, many existing anomaly detection approaches require either human intervention or domain knowledge, and may suffer from high computation complexity, consequently hindering their applicability in real-world scenarios. Therefore, a lightweight and ready-to-go approach that is able to detect anomalies in real-time is highly sought-after. Such an approach could be easily and immediately applied to perform time series anomaly detection on any commodity machine. The approach could provide timely anomaly alerts and by that enable appropriate countermeasures to be undertaken as early as possible. With these goals in mind, this paper introduces ReRe, which is a Real-time Ready-to-go proactive Anomaly Detection algorithm for streaming time series. ReRe employs two lightweight Long Short-Term Memory (LSTM) models to predict and jointly determine whether or not an upcoming data point is anomalous based on short-term historical data points and two long-term self-adaptive thresholds. Experiments based on real-world time-series datasets demonstrate the good performance of ReRe in real-time anomaly detection without requiring human intervention or domain knowledge. Copyright © 2020, The Authors. All rights reserved.

关键词： Anomaly detection

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Interfacial Engineering Boosting Charge Extraction for Efficient Photocatalytic Hydrogen Evolution

SSRN

引用

SSRN 2022年

作者： Wang, Lei Dai, Fangxu Guo, Zhiying Zhao, Weijie Li, Zhenjiang Xing, Jun Key Laboratory of Eco-chemical Engineering Ministry of Education College of Chemistry and Molecular Engineering Qingdao University of Science and Technology Qingdao266042 China School of Physics Frontiers Science Center for Mobile Information Communication and Security Southeast University Nanjing211189 China Purple Mountain Laboratories Nanjing211111 China College of Materials Science and Engineering Qingdao University of Science and Technology Qingdao266042 China College of Environment and Safety Engineering Qingdao University of Science and Technology Shandong Engineering Research Center for Marine Environment Corrosion and Safety Protection Qingdao266042 China

In heterostructure photocatalyst, metal–support interaction plays a key role in determining the photocatalytic reaction, which is rarely studied due to its complicated mechanism involving interfacial bonding, internal electric field, and charge transfer etc. Here we report an interfacial engineering to promote the photocatalytic hydrogen evolution of the model photocatalyst Pt/TiO 2 . A stable oxidized Cu + layer was inserted as an interlayer between Pt nanoparticles and TiO 2 support, which boosts the efficiency of photoinduced charge extraction and regulates the surface charge state of the photocatalyst. The synthesized photocatalyst Pt/Cu/TiO 2 exhibits highly efficient hydrogen evolution of 1 L g -1 h -1 , which is 63% higher than the photocatalyst Pt/TiO 2 . This charge extraction strategy is also evidenced on photocatalysts Pt/(Rh, Co or Ni)/TiO 2 . Our findings not only provide insight into interfacial interaction in photocatalyst, but also offer effective guidelines for the design and fabrication of high-performance photocatalysts. © 2022, The Authors. All rights reserved.

关键词： Titanium dioxide

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Graphitized and Crack-Free Porous Textile Updated from Waste Cotton for Wearable Electromagnetic Interference Shielding

SSRN

引用

SSRN 2022年

作者： Peng, Xiaoli Meng, Xiangyu Yu, Buyun Chen, Hao Liu, Zhenguo Tang, Mingyu Zheng, Yiqun Sun, Yueming Lu, Weibing Dai, Yunqian School of Chemistry and Chemical Engineering Southeast University Nanjing211189 China State Key Laboratory of Millimeter Waves School of Information Science and Engineering Southeast University Nanjing210096 China Center for Flexible RF Technology Frontiers Science Center for Mobile Information Communication and Security Southeast University Nanjing210096 China Purple Mountain Laboratories Nanjing211111 China School of Chemistry Chemical Engineering and Materials Jining University Shandong Qufu273155 China

Developing easy-tailorable and high-efficient electromagnetic interference (EMI) shielding textile from waste textile is highly desirable to meet the demand for wearable electronics and economic sustainability for modern society. However, simultaneously featuring with good electrical conductivity and wearability of the derived waste textiles remains a daunting challenge, especially in the absence of conducting additives. Herein, we report the fabrication of a tailorable textile with high flexibility and conductivity to address this challenge via a straightforward graphitization strategy based on a mild reduction procedure. Aided by finite element analysis (FEA) and computer simulation technology (CST) for performance screening in advance, the mechanically-favorable but EMI shielding-unfavorable pores intrinsically produced in interwoven textile calls for a low square resistance of the whole textile. The textile with desirable features is fabricated by the Ni-species catalyzed graphitization of cotton cellulose with large-scale production potential. Moreover, the low square resistance of the textile remains stable after immersion in extremely corrosive chemicals or 10000-times bending tests. The textile with a small thickness of 1.4 mm achieves an EMI SE of 107 dB in 12−18 GHz, 3 fold exceeding the demand for commercial applications (>30 dB). Practical demonstrations show that personal information in a mobile phone or ID card can be prevented from being read by pockets tailored from textiles. This work shows great potential for massive production of high-efficiency EMI shielding textiles for livelihood or military towards the next-generation wearable electronic technology. © 2022, The Authors. All rights reserved.

关键词： Graphitization

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Performance Analysis of Phase Pre-Configured Spatial Modulation Empowered by RIS With Discrete Phase Alphabet

引用

IEEE Transactions on Vehicular technology 2025年

作者： Liu, Chaowen Shi, Zhengmin Zheng, Tong-Xing Liu, Boyang Wen, Miaowen Wang, Wenjie Lu, Guangyue Xi'an University of Posts and Telecommunications Shaanxi Key Laboratory of Information Communication Network and Security Xi'an710121 China National Key Laboratory of Multi-domain Data Collaborative Processing and Control Xi'an710068 China Xi'an Jiaotong University School of Information and Communications Engineering Xi'an710049 China South China University of Technology School of Electronics and Information Engineering Guangzhou510641 China

In this paper, we are motivated to introduce and investigate a novel reconfigurable intelligent surface assisted phase preconfigured spatial modulation (RIS-PPSM) scheme, which can be employed to achieve reliability enhanced transmissions. In the RIS-PPSM scheme, pre-configured phases are injected at the transmitter, and the reflection coefficients are designed for the RIS with a practical discrete phase alphabet, such that the resolution of transmit antennas is increased, and hence the overall transmission performance is remarkably elevated. Upon utilizing the moment generating function based unified analysis framework, we deduce out the closed-form expressions for the average bit error probability upper bound and discrete input continuous-output memoryless channel capacity. Finally, simulation results are depicted to demonstrate the accuracy of the theoretical analysis and the superiority of the proposed RIS-PPSM. © 1967-2012 IEEE.

关键词： discrete phase alphabet performance analysis phase pre-configuration Reconfigurable intelligent surface (RIS) spatial modulation

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A DOA estimation method for area array based on dimensionality reduction processing

A DOA estimation method for area array based on dimensionali...

引用

International Conference on information science and control Engineering (ICISCE)

作者： Sun Wei Han Yu Zhou Qing Science and Technology on Commuication Information Security Control Laboratory No.36 Research Institute of CETC Jiaxing Zhejiang China

Aiming at the problems of traditional beamforming algorithms that require a two-dimensional angle search for two-dimensional DOA estimation using rectangular arrays, which takes a long time, this paper provides a dimensionality reduction method through theoretical derivation and numerical calculation. This method uses coordinate conversion and secondary optimization, successively calculates the angle of the target relative to the X and Y axes, and combines the idea of least squares to finally calculate the azimuth and elevation angle of the target, turning the two-dimensional problem into a one-dimensional search, which greatly reduces the amount of calculation. The simulation results show that the angle estimation accuracy of this method is equivalent to that of the traditional MUSIC method, but its algorithm complexity and calculation time are reduced a lot, which is very suitable for engineering applications.

关键词： Dimensionality reduction Direction-of-arrival estimation Simulation Estimation Optimization methods Search problems Turning

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Optimal control of linear Gaussian quantum systems via quantum learning control

arXiv

引用

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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