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arXiv 2018年

作者： Liao, Qin Ying, G.U.O. Wang, Yijun Huang, Duan School of Information Science and Engineering Central South University Changsha410083 China State Key Laboratory of Advanced Optical Communication Systems and Networks Shanghai Jiao Tong University Shanghai200240 China

We suggest an improved plug-and-play measurement-device-independent (MDI) continuous-variable quantum key distribution (CVQKD) via the dual-phase modulation (DPM), aiming to solve an implementation problem with no extra performance penalty. The synchronous loophole of different lasers from Alice and Bob can be elegantly eliminated in the plug-and-play configuration, which gives birth to the convenient implementation when comparing to the Gaussian-modulated coherent-state protocol. While the local oscillator (LO) can be locally generated by the trusted part Charlie, the LO-aimed attacks can be accurately detected in the data post-processing. We derive the security bounds of the DPM-based MDI-CVQKD against optimal Gaussian collective attacks. Taking the finite-size effect into account, the secret key rate can be increased due to the fact that almost all raw keys of the MDI-CVQKD system can be fully exploited for the final secret key generation without sacrificing raw keys in parameter estimation. Moreover, we give an experimental concept of the proposed scheme which can be deemed guideline for final implementation. Copyright © 2018, The Authors. All rights reserved.

关键词： Quantum cryptography

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High-energetic ultrafast fiber laser sources tunable from 920 to 1030 nm based on tapered photonic crystal fibers

High-energetic ultrafast fiber laser sources tunable from 92...

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Laser Applications Conference, LAC 2017

作者： Niu, Fuzeng Wang, Aimin Li, Jiayin Yang, Wan Zhang, Zhigang Academy for Advanced Interdisciplinary Studies Peking University Beijing100871 China State Key Laboratory of Advanced Optical Communication System and Networks School of Electronics Engineering and Computer Science Peking University Beijing100871 China

By designing the taper structure, optimizing the tapered fiber dispersion, we demonstrate an Yb-fiber laser based ultrafast source emits 37 MHz, ~100 fs pulses widely tunable in 920-1030 nm with up to 10 nJ pulse ener... 详细信息

ISBN: (纸本)9780960038077

关键词： Fiber lasers

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Compressive sensing based channel parameter estimation for continuous-variable quantum key distribution

Compressive sensing based channel parameter estimation for c...

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第十八届全国量子光学学术会议

作者：何哲 Y.Su L.Zhang Y.Guo G.H.Zeng D.Huang 中南大学 School of Information Science & Engineering Central South University State Key Laboratory of Advanced Optical Communication Systems and Networks and Center of Quantum Information Sensing and ProcessingShanghai Jiao Tong University

Parameter estimation is one of the crucial procedure in continuous-variable quantum key distribution(CVQKD), aiming at acquiring the real paramaters values that are relevant for the system performance in the composable security framework. In general, almost half of the raw key are used for parameter estimation to guarantee the accuracy, leading to the decline in key rate. This introduces a tradeoff between the secret key rate and the accuracy or parameter estimation in the finite-size regime. In this paper, a compressvie sensing(CS) based channel parameter estimation approach is proposed. Utilizing beam extinction and a variety of turbulence effects in the atmospheric channel, the CS framework is modeled to estimate the transmittance, which can achieve accurate parameter estimation. We apply CS for measuring the initial state of a subsystem and predicting the remaining state in parameter estimation procedure. Simulation results illustrate that our purposed approach of CS based channel parameter estimation has a superior performance which can provide higher secret key rate.

关键词： Compressive sensing based channel parameter estimation for continuous-variable quantum key distribution

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An observable based approach to evaluating quantum coherence

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AIP Conference Proceedings 2020年第1期2241卷

作者： Suman Mandal Marek Narozniak Chandrashekar Radhakrishnan Manikandan Kondappan Zhiqiang Jiao Xiamin Jin Tim Byrnes 1)Division of Arts and Sciences NYU Shanghai 1555 Century Ave Shanghai-200122 China 2)Department of Physics New York University New York NY-10003 USA 3)State Key Laboratory of Precision Spectroscopy East China Normal University Minhang Shanghai-200241 China 4)State Key Laboratory of Advanced Optical Communication Systems and Networks School of Physics and Astronomy Shanghai Jiao Tong University Shanghai-200240 China 5)National Institute of Informatics Chiyoda City Tokyo-101-8430 Japan

We introduce a procedure based on quantum expectation values of measurement observables to characterize quantum coherence. In a bipartite system, the two-point correlation function is used in combination with the Schatten-1 norm to estimate the quantum coherence. This definition of coherence allows the decomposition into contributions corresponding to the non-classical correlations between the subsystems and localized on each subsystem. We illustrate the method for several bipartite systems, showing that an incomplete basis still gives a qualitative measure of the coherence.

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Visible astro-comb filtered by a passively-stabilized Fabry-Perot cavity

arXiv

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arXiv 2018年

作者： Ma, Yuxuan Meng, Fei Liu, Yizhou Zhao, Fei Zhao, Gang Wang, Aimin Zhang, Zhigang State Key Laboratory of Advanced Optical Communication System and Networks School of Electronics Engineering and Computer Science Peking University Beijing100871 China National Astronomical Observatories of China Chinese Academy of Science Beijing100012 China National Institute of Metrology Beijing100029 China

We demonstrate a compact 29.3 GHz visible astro-comb covering the spectrum from 560nm to 700nm. A 837 MHz Yb:fiber laser frequency comb phase locked to a Rb clock served as the seed comb to ensure the frequency stability and high side mode suppression ratio. After the visible super-continuum generation, a cavity-length-fixed Fabry-Perot cavity made by ultra-low expansion glass was utilized to filter the comb teeth for eliminating the rapid active dithering. The mirrors were home-made complementary chirped mirrors pair with zero dispersion and high reflection to guarantee no mode skipping. These filtered comb teeth were clearly resolved in an astronomical spectrograph of 49,000 resolution, exhibiting sharp linetype, zero noise floor, and uniform exposure amplitude. Copyright © 2018, The Authors. All rights reserved.

关键词： Cavity resonators

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Long-distance continuous-variable quantum key distribution using separable Gaussian states

arXiv

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arXiv 2018年

作者： Zhou, Jian Huang, Duan Guo, Ying School of Information Science and Engineering Central South University Changsha410083 China State Key Laboratory of Advanced Optical Communication Systems and Networks Department of Electronic Engineering Shanghai Jiao Tong University Shanghai200240 China

Continuous-variable quantum key distribution (CVQKD) is considered to be an alternative to classical cryptography for secure communication. However, its transmission distance is restricted to metropolitan areas, given that it is affected by the channel excess noise and losses. In this paper, we present a scheme for implementing long-distance CVQKD using separable Gaussian states. This tunable QKD protocol requires separable Gaussian states, which are squeezed and displaced, along with the assistance of classical communication and available linear optics components. This protocol originates from the entanglement of one mode and the auxiliary mode used for distribution, which is first destroyed by local correlated noises and restored subsequently by the interference of the auxiliary mode with the second distant separable correlated mode. The displacement matrix is organized by two six-dimensional vectors and is finally fixed by the separability of the tripartite system. The separability between the ancilla and Alice and Bob’s system mitigates the enemy’s eavesdropping, leading to tolerating higher excess noise and achieving longer transmission distance. Copyright © 2018, The Authors. All rights reserved.

关键词： Quantum cryptography

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Wavelength dimensioning for wavelength-routed WDM satellite network

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Chinese Journal of Aeronautics 2016年第3期29卷 763-771页

作者： Liu Zhe Guo Wei Deng Changlin Hu Weisheng State Key Lab of Advanced Optical Communication Systems and Networks Shanghai Jiao Tong University

Internet and broadband applications driven by data traffic demand have become key dri- vers for satellite constellations. The key technology to satisfy the high capacity requirements between satellites is optical satellite networks by means of wavelength division multiplexing inter- satellite links （ISLs） with wavelength routing （WDM-OSN）. Due to the limited optical amplifier bandwidth onboard the satellite, it is important to minimize the wavelength requirements to provi- sion requests. However, ISLs should be dynamically established and deleted for each satellite according to its visible satellites. Furthermore, different link assignments will result in different topologies, hence yielding different routings and wavelength assignments. Thus, a perfect match model-based link assignment scheme （LAS-PMM） is proposed to design an appropriate topology such that shorter path could be routed and less wavelengths could be assigned for each ISL along the path. Finally, simulation results show that in comparison to the regular Manhattan street net- work （MSN） topology, wavelength requirements and average end-to-end delay based on the topol- ogy generated by LAS-PMM could be reduced by 24.8% and 12.4%, respectively.

关键词： LAS LAS-PMM Routing Wavelength assignment Wavelength dimensioning WDM-OSN

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Distribution of millimeter waves over a fiber link with high frequency stability(Invited Paper)

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Chinese Optics Letters 2016年第12期14卷 21-24页

作者：董毅刘张唯一王小成邓楠谢玮霖胡卫生 State Key Laboratory of Advanced Optical Communication Systems and Networks Shanghai Jiao Tong University

We present a theoretical analysis, systematic simulation, and experimental measurements for the phase noise,timing jitter, and frequency stability in the frequency distribution of millimeter waves over distant optical fiber links. The conception that the dissemination of a higher frequency reference instead of a lower one can achieve a better frequency stability is discussed and verified. We find that the system＇s noise floor, including thermal noise,shot noise, and any other noise from electronic components, is considered to be a fundamental limitation for a frequency reference transmission system. Benefiting from the high-precision time delay variation discrimination and accurate locking control operation, a highly stabilized reference is distributed to a remote end over a 60 km spooled fiber, achieving a frequency stability of 4 × 10^（-17） at an average time 1000 s, corresponding to 23 fs of RMS timing jitter（0.01 Hz^（–1） MHz）.

关键词： millimeter jitter dissemination discrimination links conception locking distant instead verified

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Kernel Adaptive Filtering for Nonlinearity-Tolerant optical Direct Detection systems

Kernel Adaptive Filtering for Nonlinearity-Tolerant Optical ...

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European Conference on optical communication (ECOC)

作者： L. Zhang O. Ozolins R. Lin A. Udalcovs X. Pang L. Gan R. Schatz A. Djupsjöbacka J. Mårtensson U. Westergren M. Tang S. Fu D. Liu W. Tong S. Popov G. Jacobsen W. Hu S. Xiao J. Chen KTH Royal Institute of Technology Kista Sweden NETLAB - Networking and Transmission Laboratory RISE AB Kista Sweden Huazhong University of Science and Technology Wuhan China Yangtze Optical Fiber and Cable Joint Stock Limited Company Wuhan China State Key Laboratory of Advanced Optical Communication System and Networks Shanghai Jiao Tong University Shanghai China

Kernel adaptive filtering (KAF) is proposed for nonlinearity-tolerant optical direct detection. for 7×128 Gbit/s PAM4 transmission over 33.6km 7-core-fiber, KAF only needs 10 equalizer taps to reach KP4-FEC limit... 详细信息

关键词： Kernel optical filters Adaptive optics Fiber nonlinear optics optical fibers

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Digital Radio-Over-Multicore-Fiber system with Self-Homodyne Coherent Detection and Entropy Coding for Mobile Fronthaul

Digital Radio-Over-Multicore-Fiber System with Self-Homodyne...

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European Conference on optical communication (ECOC)

作者： Lu Zhang Aleksejs Udalcovs Rui Lin Oskars Ozolins Xiaodan Pang Lin Gan Richard Schatz Anders Djupsjöbacka Jonas Mårtensson Ming Tang Songnian Fu Deming Liu Weijun Tong Sergei Povov Gunnar Jacobsen Weisheng Hu Shilin Xiao Jiajia Chen KTH Royal Institute of Technology Kista Sweden NETLAB – Networking and Transmission Laboratory RISE AB Kista Sweden Huazhong University of Science and Technology Wuhan China Yangtze Optical Fiber and Cable Joint Stock Limited Company Wuhan China State Key Laboratory of Advanced Optical Communication System and Networks Shanghai Jiao Tong University Shanghai China

We experimentally demonstrate a 28-Gbaud 16-QAM self-homodyne digital radio-over-33.6km-7-core-fiber system with entropy coding for mobile fronthaul, achieving error-free carrier aggregation of 330 100-MHz 4096-QAM 5G... 详细信息

关键词： Quantization (signal) Modulation Coherence Entropy coding OFDM Entropy

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