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arXiv 2019年

作者： Zhang, Yongfei Zhang, Chao Fan, Rui Ma, Siwei Chen, Zhibo Kuo, C.-C. Jay Beijing Key Laboratory of Digital Media School of Computer Science and Engineering State Key Laboratory of Virtual Reality Technology and Systems Beihang University Beijing100191 China China Academy of Electronic and Information Technology Beijing100041 China Institute of Digital Media School of Electronics Engineering and Computer Science Peking University Beijing100871 China University of Science and Technology of China Hefei Anhui230026 China University of Southern California Los AngelesCA90089 United States

High Efficiency Video Coding (HEVC) has doubled the video compression ratio with equivalent subjective quality as compared to its predecessor H.264/AVC. The significant coding efficiency improvement is attributed to many new techniques. Inter-frame coding is one of the most powerful yet complicated techniques therein and has posed high computational burden thus main obstacle in HEVC-based real-time applications. Recently, plenty of research has been done to optimize the inter-frame coding, either to reduce the complexity for real-time applications, or to further enhance the encoding efficiency. In this paper, we provide a comprehensive review of the state-of-the-art techniques for HEVC inter-frame coding from three aspects, namely fast inter coding solutions, implementation on different hardware platforms as well as advanced inter coding techniques. More specifically, different algorithms in each aspect are further subdivided into sub-categories and compared in terms of pros, cons, coding efficiency and coding complexity. To the best of our knowledge, this is the first such comprehensive review of the recent advances of the inter-frame coding for HEVC and hopefully it would help the improvement, implementation and applications of HEVC as well as the ongoing development of the next generation video coding standard. Copyright © 2019, The Authors. All rights reserved.

关键词： Efficiency

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Quantum repeaters: From quantum networks to the quantum internet

arXiv

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arXiv 2022年

作者： Azuma, Koji Economou, Sophia E. Elkouss, David Hilaire, Paul Jiang, Liang Lo, Hoi-Kwong Tzitrin, Ilan NTT Basic Research Laboratories NTT Corporation 3-1 Morinosato Wakamiya Kanagawa Atsugi243-0198 Japan NTT Research Center for Theoretical Quantum Physics NTT Corporation 3-1 Morinosato-Wakamiya Kanagawa Atsugi243-0198 Japan Department of Physics Virginia Tech BlacksburgVA24061 United States QuTech Delft University of Technology Lorentzweg 1 Delft2628 CJ Netherlands Networked Quantum Devices Unit Okinawa Institute of Science and Technology Graduate University Okinawa Japan Quandela SAS 10 Boulevard Thomas Gobert Palaiseau91120 France Pritzker School of Molecular Engineering The University of Chicago ChicagoIL60637 United States Quantum Bridge Technologies Inc. 100 College Street TorontoONM5G 1L5 Canada Department of Physics University of Hong Kong Pokfulam Hong Kong Center for Quantum Information and Quantum Control Department of Physics Department of Electrical & Computer Engineering University of Toronto TorontoM5S 3G4 Canada Department of Physics University of Toronto Toronto Canada

A quantum internet is the holy grail of quantum information processing, enabling the deployment of a broad range of quantum technologies and protocols on a global scale. However, numerous challenges exist before the quantum internet can become a reality. Perhaps the most crucial of these is the realization of a quantum repeater, an essential component in the long-distance transmission of quantum information. As the analog of a classical repeater, extender, or booster, the quantum repeater works to overcome loss and noise in the quantum channels comprising a quantum network. Here, we review the conceptual frameworks and architectures for quantum repeaters, as well as the experimental progress towards their realization. We also discuss the various near-term proposals to overcome the limits to the communication rates set by point-to-point quantum communication. Finally, we overview how quantum repeaters fit within the broader challenge of designing and implementing a quantum internet. Copyright © 2022, The Authors. All rights reserved.

关键词： Quantum optics

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Artificial Room-Temperature Ferromagnetism of Bulk van der Waals VSe2

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Advanced science (Weinheim, Baden-Wurttemberg, Germany) 2025年 e04746页

作者： Jinhyoung Lee Gunhyoung Kim Hyunho Seok Hyunbin Choi Hyeonjeong Lee Seokchan Lee Geonwook Kim Hyunho Kim Seowoo Son Sihoon Son Dongho Lee Hosin Hwang Hyelim Shin Sujeong Han Geumji Back Alexina Ollier Yeon-Ji Kim Lei Fang Gyuho Han Goo-Eun Jung Youngi Lee Hyeong-U Kim Kenji Watanabe Takashi Taniguchi Wonjun Shin Suraj Cheema Andreas Heinrich Won-Jun Jang Taesung Kim School of Mechanical Engineering Sungkyunkwan University (SKKU) Suwon-si Gyeonggi-do 16419 South Korea. Center for Quantum Nanoscience Institute for Basic Science (IBS) Seoul 03760 South Korea. Department of Semiconductor Convergence Engineering Sungkyunkwan University Suwon 16419 South Korea. SKKU Advanced Institute of Nanotechnology (SAINT) Sungkyunkwan University Suwon 16419 South Korea. Department of Nano Science and Technology Sungkyunkwan University Suwon 16419 South Korea. Research Laboratory of Electronics Massachusetts Institute of Technology Cambridge MA 02139 USA. Department of Materials Science and Engineering Massachusetts Institute of Technology Cambridge MA 02139 USA. Department of Physics Ewha Womans University Seoul 03760 South Korea. Park Systems Corporation 109 Gwanggyo-ro Yeongtong-gu Suwon-si Gyeonggi-do 16229 South Korea. Semiconductor Manufacturing Research Center Korea Institute of Machinery and Materials (KIMM) Daejeon 34103 South Korea. Nano-Mechatronics KIMM Campus University of Science & Technology (UST) Daejeon 34113 South Korea. National Institute for Materials Science Namiki 1-1 Tsukuba Ibaraki 305-0044 Japan. Department of Electrical Engineering and Computer Science Massachusetts Institute of Technology Cambridge MA 02139 USA. Department of Nano Engineering Sungkyunkwan University Suwon 16419 South Korea.

Originating from spin and orbital motion, van der Waals (vdW) ferromagnetism has emerged as a significant platform to experimentally access the fundamental physics of magnetism in reduced dimensions, including quantum computing, sensing, and data storage. However, currently, available vdW ferromagnetic materials can be achieved with mechanical exfoliation and low-temperature operation, which completely limits the monolithic integration of vdW ferromagnets with other functional materials. Nonetheless, the direct synthesis of room-temperature vdW ferromagnets has not been achieved commercially, owing to the imprecise control of the layer-by-layer growth, high-temperature synthesis, and low yield. To overcome these limitations, herein, an artificial vdW ferromagnetic platform has been reported, which activates the nano-crystallization and its corresponding ferromagnetism in bulk VSe via Ar + HS plasma sulfurization. Sweeping the magnetic field, vdW ferromagnetism has been spatially resolved, which experimentally correlates with magnetization reversal behavior and domain pinning effects. Furthermore, nano-crystallization of VSe is clearly validated with transmission electron microscopy, energy-dispersive X-ray spectroscopy, X-ray photoelectron spectroscopy, and selected area diffraction analysis. In conclusion, it is envisioned that the artificial vdW ferromagnetic platform can artificially inject the ferromagnetism in bulk vdW VSe, which has not been possible previously.

关键词： ferromagnetic magnetic force microscopy nano‐crystallization van der Waals materials vanadium selenide

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A Laser-Pumped Cs-4He Magnetometer for Metrology

A Laser-Pumped Cs-4He Magnetometer for Metrology

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2018 Conference on Precision Electromagnetic Measurements, CPEM 2018

作者： Jiqing, Fu He, Wang Xiang, Peng Wei, Zhang Magnetic Quality Laboratory of National Institute of Metrology Beijing100013 China Center for Quantum Information Technology Peking University State Key Laboratory of Advanced Optical Communication Systems and Networks School of Electronics Engineering and Computer Science Beijing100871 China

ISBN: (纸本)9781538609736

This paper describes a laser-pumped cesium-helium magnetometer (CHM) with high polarization efficiency. The magnetic-resonance signal amplitude has been improved by one order of magnitude comparing with the lamp-pumped scheme. The optimal parameters for increasing the signal-to-noise ratio of the magnetometer are obtained and discussed. © 2018 IEEE.

关键词： Optical pumping

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A Progressive Background Updating Based Coding Scheme for Surveillance Videos

A Progressive Background Updating Based Coding Scheme for Su...

引用

IEEE Visual Communications and Image Processing (VCIP)

作者： Meng Li Yunhui Shi Wenpeng Ding Xiaojie Liu Jiaying Liu Baocai Yin Beijing Key Laboratory of Multimedia and Intelligent Software Technology Faculty of Information Technology Beijing University of Technology Beijing China School of Computer Science and Technology Henan Institute of Technology Xinxiang China Peking University Faculty of Electronic Information and Electrical Engineering Dalian University of Technology Dalian China

Background based coding is an effective scheme to improve the coding efficiency of surveillance videos. However, it takes a long time to generate a high quality background picture (BG-picture). And the encoding of the high quality BG-picture will increase the bitrate abruptly. To solve these problems, a progressive background updating based coding scheme is proposed in this paper. In the proposed scheme, the BG-picture is updated block by block. To improve the overall coding efficiency, an importance map is designed to select the valid background blocks (B-blocks) progressively which will be encoded with high quality. It is worth noting that only the valid B-blocks is encoded instead of the entire BG-picture. Compared with the reference software of Versatile Video Coding (VVC), the proposed scheme achieves about 23.3 percent bit-rate saving on average.

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Generation and Hall effect of skyrmions enabled using nonmagnetic point contacts

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Physical Review B 2019年第18期100卷 184426-184426页

作者： Zidong Wang Xichao Zhang Jing Xia Le Zhao Keyu Wu Guoqiang Yu Kang L. Wang Xiaoxi Liu Suzanne G. E. te Velthuis Axel Hoffmann Yan Zhou Wanjun Jiang State Key Laboratory of Low-Dimensional Quantum Physics and Department of Physics Tsinghua University Beijing 100084 China Frontier Science Center for Quantum Information Tsinghua University Beijing 100084 China School of Science and Engineering The Chinese University of Hong Kong Shenzhen Guangdong 518172 China Beijing National Laboratory for Condensed Matter Physics Institute of Physics Chinese Academy of Sciences Beijing 100190 China Department of Electrical Engineering University of California Los Angeles California 90095 USA Department of Electrical and Computer Engineering Shinshu University 4-17-1 Wakasato Nagano 380–8553 Japan Materials Science Division Argonne National Laboratory Lemont Illinois 60439 USA

The generation and manipulation of magnetic skyrmions are perquisites for any skyrmion-based information processing devices, where skyrmions are used as nonvolatile information carriers. In this work, we report experimentally the skyrmion generation through the usage of a nonmagnetic conducting Ti/Au point contact in a device made of a Ta/CoFeB/TaOx trilayer film. Moreover, the accompanied topological charge-dependent skyrmion dynamics, namely the skyrmion Hall effect, is also observed in the same device. The creation process of a skyrmion has been numerically reproduced through micromagnetic simulations, in which the important role of the skyrmion-antiskyrmion pair formation is identified. The motion and Hall effect of a skyrmion, immediately after its creation, is described using a modified Thiele equation after taking into account the contribution from spatially inhomogeneous spin-orbit torques and the Magnus force. Our results on the simultaneous generation and manipulation of skyrmions using a nonmagnetic point contact are useful for understanding the ultrafast dynamics of skyrmion creation, which could also provide an effective pathway for designing skyrmion-based devices.

关键词： Dzyaloshinskii-Moriya interaction Hall effect Micromagnetism Skyrmions Spin texture Spin torque Magnetic multilayers Point contacts Magneto-optical Kerr effect Micromagnetic modeling

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Extended Drude Model for Intraband-Transition-Induced Optical Nonlinearity

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Physical Review Applied 2019年第6期11卷 064062-064062页

作者： Heng Wang Kang Du Chuhao Jiang Zhiqiang Yang Lixia Ren Wending Zhang Soo Jin Chua Ting Mei MOE Key Laboratory of Material Physics and Chemistry under Extraordinary Conditions and Shaanxi Key Laboratory of Optical Information Technology School of Science Northwestern Polytechnical University Xi’an 710072 China Department of Electrical and Computer Engineering National University of Singapore 4 Engineering Drive 3 Singapore 117583 LEES Program Singapore-MIT Alliance for Research & Technology (SMART) 1 CREATE Way #10-01 CREATE Tower Singapore 138602

No existing model has completely explained the physics of the optical nonlinearity for epsilon-near-zero materials, which have recently emerged as candidates for design and fabrication of active nanophotonic devices. We propose to extend the Drude model by adopting a weighted electron effective mass, which takes into account the electron distribution in the nonparabolic conduction band. The extended Drude model is able to interpret the cause of the nonlinearity and provide a functional relationship between the refractive index and wavelength. Both the band nonparabolicity and the temperature-dependent mobility are responsible for the intraband-transition-induced optical nonlinearity. The spectrally resolved nonlinear refractive index and nonlinear susceptibilities are obtained from this model. The results can be applied to other transparent conducting oxides and will help in the design and modeling of spectral responses of nonlinear plasmonic devices.

关键词： Electronic transitions Nonlinear optical susceptibility Optoelectronics Plasmonics Ultrafast optics Thin films Free-electron model Ultrafast pump-probe spectroscopy

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High-precision phase noise estimation for continuous-variable quantum key distribution

High-precision phase noise estimation for continuous-variabl...

引用

Frontiers in Optics, FIO 2018

作者： Zhao, Yijia Zhang, Yichen Huang, Yundi Yu, Song Guo, Hong State Key Laboratory of Information Photonics and Optical Communications Beijing University of Posts and Telecommunications Beijing100876 China State Key Laboratory of Advanced Optical Communication Systems and Networks School of Electronics Engineering and Computer Science Center for Quantum Information Technology Peking University Beijing100871 China

We propose a high-precision phase noise estimation for continuous-variable quantum key distribution to reduce the phase noise caused by inaccurate estimation. The phase noise is reduced below 1/10 by using modified re... 详细信息

ISBN: (纸本)9781943580460

关键词： Phase noise

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Blockchain based Consensus Checking in Cloud Storage

Blockchain based Consensus Checking in Cloud Storage

引用

International Symposium on Autonomous Decentralized systems (ISADAS)

作者： Guanqiu Qi Zhiqin Zhu Matthew Haner Jaesung Sim Jian Sun Yi Chai Yinong Chen Li Yongfu Mathematics and Computer Information Science Mansfield University of Pennsylvania Mansfield PA 16933 USA College of Automation Chongqing University of Posts and Telecommunications Chongqing 400065 China School of Electronic and Information Engineering Southwest University Chongqing 400715 China Ministry of Education Key Laboratory of Complex System Safety and Control (Chongqing University) Chongqing 400044 China School of Computing Informatics and Decision Systems Engineering Arizona State University Tempe AZ 85287 USA

ISBN: (数字)9781728116723

ISBN: (纸本)9781728116730

In cloud computing, data is duplicated to prevent data loss. One way to achieve data consistency in such a distributed computing systems is to use a blockchain. Based on practical Byzantine fault tolerance (PBFT), a specific type of blockchain, this paper proposes a synchronous Byzantine fault tolerance (SBFT) algorithm that not only maintains data consistency, but also has much higher efficiency than other general blockchain algorithms. We provide experimental results that demonstrate the algorithm's data consistency, efficiency, and reliability.

关键词： Cloud computing Fault tolerance Fault tolerant systems Peer-to-peer computing

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Analysis and optimization for RIS-aided multi-pair communications relying on statistical CSI

arXiv

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arXiv 2020年

作者： Peng, Zhangjie Li, Tianshu Pan, Cunhua Ren, Hong Xu, Wei Renzo, Marco Di College of Information Mechanical and Electrical Engineering Shanghai Normal University Shanghai200234 China Institute of Artificial Intelligence on Education Shanghai Normal University Shanghai200234 China College of Information Mechanical and Electrical Engineering Shanghai Normal University Shanghai200234 China School of Electronic Engineering and Computer Science Queen Mary University of London LondonE1 4NS United Kingdom National Mobile Communications Research Lab Southeast University Nanjing210096 China Henan Joint International Research Laboratory of Intelligent Networking and Data Analysis Zhengzhou University Zhengzhou450001 China Université Paris-Saclay CNRS CentraleSupélec Laboratoire des Signaux et Systèmes 3 Rue Joliot-Curie Gif-surYvette91192 France

In this paper, we investigate a reconfigurable intelligent surface (RIS) aided multi-pair communication system, in which multi-pair users exchange information via an RIS. We derive an approximate expression for the achievable rate by assuming that statistical channel state information (CSI) is available. A genetic algorithm (GA) to solve the rate maximization problem is proposed as well. In particular, we consider implementations of RISs with continuous phase shifts (CPSs) and discrete phase shifts (DPSs). Simulation results verify the obtained results and show that the proposed GA method has almost the same performance as the globally optimal solution. In addition, numerical results show that three quantization bits can achieve a large portion of the achievable rate for the CPSs setup. © 2020, CC BY.

关键词： Genetic algorithms

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