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Asia communications and Photonics Conference

作者： Bitao Shen Haowen Shu Xingjun Wang State Key Laboratory on Advanced Optical Communication Systems and Networks Department of Electronics School of Electronics Engineering and Computer Science Peking University. Beijing 100871 P. R. China Nano-optoelectronics Frontier Center of Ministry of Education at Peking University Beijing 100871 P. R. China

We propose a design method based on coupling mode theory for high-fabrication-tolerance mode (de)multiplexer. A TE_0&TE_1 mode multiplexer with <1.5 dB insertion loss, (1.5～1.6) μm operation bandwidth and 20 ... 详细信息

ISBN: (纸本)9781943580705

关键词： Coupling efficiency Effective refractive index Genetic algorithms Mode division multiplexing Multiplexers Optical directional couplers

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Experimental implementation of high-speed balanced homodyne detector

Experimental implementation of high-speed balanced homodyne ...

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Frontiers in Optics, FIO 2018

作者： Zhang, Xiaoxiong Zhang, Yichen Xu, Bingjie Yu, Song Guo, Hong State Key Laboratory of Information Photonics and Optical Communications Beijing University of Posts and Telecommunications Beijing100876 China Science and Technology on Security Communication Laboratory Institute of Southwestern Communication Chengdu610041 China State Key Laboratory of Advanced Optical Communications Systems and Networks School of Electronics Engineering and Computer Science Center for Quantum Information Technology Center for Computational Science and Engineering Peking University Beijing100876 China

We present a high-speed balanced homodyne detector whose bandwidth is above 900 MHz and quantum to classical noise ratio reaches 12 dB respectively, which could be applied to the high-speed continuous variable quantum... 详细信息

ISBN: (纸本)9781943580460

关键词： Quantum optics

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Phase noise based quantum random number generator suppressing classical noise

Phase noise based quantum random number generator suppressin...

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Frontiers in Optics, FIO 2018

作者： Chen, Ziyang Li, Zhengyu Zhang, Yichen Guo, Hong 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 State Key Laboratory of Information Photonics and Optical Communications Beijing University of Posts and Telecommunications Beijing100876 China

We present a phase-noise-based random number generation scheme with a rate of 600Mbps without using optical delay line, which can remove the classical noise induced by fiber jitter. © 2018 The Author(s).

ISBN: (纸本)9781943580460

关键词： Phase noise

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

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

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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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Timing jitter of high repetition rate mode-locked fiber lasers

Timing jitter of high repetition rate mode-locked fiber lase...

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Conference on Lasers and Electro-Optics/Pacific Rim, CLEOPR 2018

作者： Wang, Yan Tian, Haochen Ma, Yuxuan Song, Youjian Zhang, Zhigang State Key Laboratory of Advanced Optical Communication Systems and Networks School of Electronics Engineering and Computer Science Peking University Beijing100871 China Ultrafast Laser Laboratory Key Laboratory of Opto-electronic Information Technical Science Ministry of Education School of Precision Instrument and Opto-electronics Engineering Tianjin University Tianjin300072 China

We characterized the timing jitter of two 880 MHz Yb-doped mode-locked fiber lasers using the optical cross-correlation technique. The lowest residual timing jitter is 3.5 fs rms (integrated from 5MHz to 100 kHz). ... 详细信息

ISBN: (纸本)9781943580453

关键词： Timing jitter

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Low Latency Driven Effective Capacity Analysis for Non-Orthogonal and Orthogonal Spectrum Access

Low Latency Driven Effective Capacity Analysis for Non-Ortho...

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2018 IEEE Globecom Workshops, GC Wkshps 2018

作者： Yu, Wenjuan Musavian, Leila Quddus, Atta Ul Ni, Qiang Xiao, Pei Institute of Communication Systems University of Surrey GuildfordGU2 7XH United Kingdom University of Essex School of Computer Science and Electronic Engineering United Kingdom InfoLab21 Lancaster University School of Computing and Communications United Kingdom

ISBN: (纸本)9781538649206

In this paper, we theoretically investigate the performance of non-orthogonal and orthogonal spectrum access protocols (more generically known as NOMA) in supporting ultra-reliable low-latency communications (URLLC). The theory of effective capacity (EC) is adopted as a suitable delay-guaranteed capacity metric to flexibly represent the users' delay requirements. Then, the total EC difference between a downlink user-paired NOMA network and a downlink orthogonal multiple access (OMA) network is analytically studied. Exact closed-form expressions and the approximated closed-forms at high signal-to-noise ratios (SNRs) are derived for both networks and validated through simulation results. It is shown that for a user pair in which two users with the most distinct channel conditions are paired together, NOMA still achieves higher total EC (compared to OMA) in high SNR regime as the user group size becomes larger, although the EC performance of both NOMA and OMA reduces with the increase in group size. It is expected that the derived analytical framework can serve as a useful reference and practical guideline for designing favourable orthogonal and nonorthogonal spectrum access schemes in supporting low-latency services. © 2018 IEEE.

关键词： Signal to noise ratio

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Additional Rayleigh-scattering phase in distributed acoustic sensing system

Additional Rayleigh-scattering phase in distributed acoustic...

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Optical Fiber Sensors, OFS 2018

作者： He, Xiangge Gu, Lijuan Liu, Fei Yi, Duo Zhang, Min Chen, Zhangyuan School of Electronics Engineering and Computer Science Peking University Beijing100871 China School of Physics Peking University Beijing100871 China Institute of Ocean Research Peking University Beijing100871 China State Key Laboratory of Advanced Optical Communication Systems and Networks Peking University Beijing100871 China

The theoretical model for distributed acoustic sensing system is developed which agrees well with the experiment, and the phase fading phenomenon caused by additional Rayleigh-scattering phase is studied for the first... 详细信息

ISBN: (纸本)9781943580507

关键词： Rayleigh scattering

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Practical security of continuous-variable quantum key distribution with reduced optical attenuation

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Physical Review A 2019年第1期100卷 012313-012313页

作者： Yi Zheng Peng Huang Anqi Huang Jinye Peng Guihua Zeng College of Information Science and Technology Northwest University Xi'an 710127 Shaanxi China State Key Laboratory of Advanced Optical Communication Systems and Networks and Center of Quantum Information Sensing and Processing Shanghai Jiao Tong University Shanghai 200240 China Institute for Quantum Information & State Key Laboratory of High Performance Computing College of Computer National University of Defense Technology Changsha 410073 China Greatwall Quantum Laboratory China Greatwall Technology Changsha 410205 China

In a practical continuous-variable quantum key distribution (CVQKD) system, the optical attenuator can adjust the Gaussian-modulated coherent states and the local oscillator signal to an optimal value for guaranteeing the security of the system and optimizing the performance of the system. However, the performance of the optical attenuator may deteriorate due to the intentional and unintentional damage of the device. In this paper, we investigate the practical security of a CVQKD system with reduced optical attenuation. We find that the secret key rate of the system may be overestimated based on the investigation of parameter estimation under the effects of reduced optical attenuation. This opens a security loophole for Eve to successfully perform an intercept-resend attack in a practical CVQKD system. To close this loophole, we add an optical fuse at Alice's output port and design a scheme to monitor the level of optical attenuation in real time, which can make the secret key rate of the system evaluated precisely. The analysis shows that these countermeasures can effectively resist this potential attack.

关键词： Quantum communication Quantum cryptography Quantum information processing with continuous variables

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The Quantum Internet (Technical Version)

arXiv

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arXiv 2025年

作者： Rohde, Peter P. Huang, Zixin Ouyang, Yingkai Huang, He-Liang Su, Zu-En Devitt, Simon Ramakrishnan, Rohit Mantri, Atul Tan, Si-Hui Liu, Nana Harrison, Scott Radhakrishnan, Chandrashekar Brennen, Gavin K. Baragiola, Ben Q. Dowling, Jonathan P. Byrnes, Tim Munro, William J. Centre for Quantum Software and Information Faculty of Engineering and Information Technology University of Technology Sydney SydneyNSW Australia Hearne Institute for Theoretical Physics Louisiana State University Baton Rouge United States School of Mathematical and Physical Sciences Macquarie University NSW2109 Australia School of Mathematical and Physical Sciences University of Sheffield SheffieldS3 7RH United Kingdom Henan Key Laboratory of Quantum Information and Cryptography Henan Zhengzhou450000 China Hefei National Laboratory for Physical Sciences at Microscale Department of Modern Physics University of Science & Technology of China Hefei China CAS Centre for Excellence and Synergetic Innovation Centre in Quantum Information & Quantum Physics University of Science & Technology of China Hefei China CAS-Alibaba Quantum Computing Laboratory Shanghai China InstituteQ Aalto University Espoo02150 Finland Indian Institute of Science Bangalore India Singapore University of Technology & Design Singapore Centre for Quantum Technologies National University of Singapore Singapore Horizon Quantum Ireland 24 Fitzwilliam Place Dublin 2 D02 T296 Ireland Institute of Natural Sciences Shanghai Jiao Tong University Shanghai200240 China School of Mathematical Sciences Shanghai Jiao Tong University Shanghai200240 China Ministry of Education Key Laboratory in Scientific and Engineering Computing Shanghai Jiao Tong University Shanghai200240 China Shanghai Artificial Intelligence Laboratory Shanghai China University of Michigan Shanghai Jiao Tong University Joint Institute Shanghai200240 China Leibniz Institute for Research & Information in Education Frankfurt am Main Germany Department of Computer Science and Engineering NYU Shanghai 567 West Yangsi Road Shanghai200124 China Centre of Excellence in Engineered Quantum Systems Macquarie University NSW Australia Centre for Quantum Computation and Communication Technology School of Science RMIT University VIC

The desire to share and unite remote digital assets motivated the development of the classical internet, the enabler of the entire 21st century economy and our modern way of life. As we enter the quantum era, it is to be expected there will be a similar demand for networking quantum assets, motivating a global quantum internet for bringing together the world's quantum resources, leveraging off their exponential trajectory in capability. We present models for quantum networking, how they might be applied in the future, and the implications they will have. Socially, economically, politically and geostrategically, the upcoming era of quantum supremacy will be as significant for the 21st century as the transistor was for the 20th. The inherently different scaling in the computational power of quantum computers fundamentally changes the dynamics of how they will operate in the future. Given their high expected initial cost, a client/server model for outsourcing computation will be essential for enabling the accessibility and proliferation of this technology, and ensuring its economic viability. We therefore anticipate the emergence of cloud quantum computing, a model for outsourcing quantum computations to the network. We argue that economic efficiency will mandate that all future quantum computers be united into a single global virtual quantum computer, offering exponentially more power to all network participants than if they were to keep their resources to themselves. This model for the allocation of computational resources is uniquely quantum, with no classical analogue, completely altering the economic landscape for the future of computation. Given the sensitivity of much of the data to which future quantum computers are going to foreseeably be applied, protocols for encrypted quantum computation will be essential - the outsourcing of computations that neither an eavesdropper nor even the server performing the computation can spy upon. This will enable new models fo

关键词： Outsourcing

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Multiple transmit power levels based NOMA for massive machine-type communications

arXiv

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arXiv 2020年

作者： Yi, Wenqiang Yu, Wenjuan Liu, Yuanwei Foh, Chuan Heng Ding, Zhiguo Nallanathan, Arumugam School of Electronic Engineering and Computer Science Queen Mary University of London LondonE1 4NS United Kingdom School of Computing and Communications InfoLab21 Lancaster University LancasterLA1 4WA United Kingdom 5G Innovation Centre Institute for Communication Systems University of Surrey GuildfordGU2 7XH United Kingdom School of Electrical and Electronic Engineering University of Manchester ManchesterM13 9PL United Kingdom

This paper proposes a tractable solution for integrating non-orthogonal multiple access (NOMA) into massive machine-type communications (mMTC) to increase the uplink connectivity. Multiple transmit power levels are provided at the user end to enable open-loop power control, which is absent from the traditional uplink NOMA with the fixed transmit power. The basics of this solution are firstly presented to analytically show the inherent performance gain in terms of the average arrival rate (AAR). Then, a practical framework based on a novel power map is proposed to associate a set of well-designed transmit power levels with each geographical region for handling the no instantaneous channel state information problem. Based on this framework, the semi-grant-free (semi-GF) transmission with two practical protocols is introduced to enhance the connectivity, which has higher AAR than both the conventional grand-based and GF transmissions. When the number of active GF devices in mMTC far exceeds the available resource blocks, the corresponding AAR tends to zero. To solve this problem, user barring techniques are employed into the semi-GF transmission to stable the traffic flow and thus increase the AAR. Lastly, promising research directions are discussed for improving the proposed networks. Copyright © 2020, The Authors. All rights reserved.

关键词： Channel state information

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