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A cost-efficient quantum access network with qubit-based synchronization

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Science China(Physics,Mechanics & Astronomy) 2024年第4期67卷 12-22页

作者： Chunfeng Huang Ye Chen Tingting Luo Wenjie He Xin Liu zhenrong zhang Kejin Wei Guangxi Key Laboratory for Relativistic Astrophysics School of Physical Science and TechnologyGuangxi UniversityNanning 530004China Guangxi Key Laboratory of Multimedia Communications and Network Technology School of Computer Electronics and InformationGuangxi UniversityNanning 530004China

Quantum key distribution(QKD)is a physical layer encryption technique that enables two distant parties to exchange secure keys with information-theoretic *** the last two decades,QKD has transitioned from laboratory research to real-world applications,including multi-user quantum access networks(QANs).This network structure allows users to share a single-photon detector at a network node through time-division multiplexing,thereby significantly reducing the network ***,current QAN implementations require additional hardware for auxiliary tasks such as time *** address this issue,we propose a cost-efficient QAN that uses qubit-based *** this approach,the transmitted qubits facilitate time synchronization,eliminating the need for additional synchronization *** tested our scheme by implementing a network for two users and successfully achieved average secure key rates of 53.84 kbps and 71.90 kbps for each user over a 50-km commercial fiber *** addition,we investigated the capacity of the access network under cross-talk and loss *** simulation results demonstrate that this scheme can support a QAN with 64 users with key rates up to 1070 *** work provides a feasible and cost-effective way to implement a multi-user QKD network,further promoting the widespread application of QKD.

关键词： quantum key distribution quantum access network qubit-based synchronization

Fiber-based quantum secure direct communication without active polarization compensation

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Science China(Physics,Mechanics & Astronomy) 2022年第12期65卷 91-96页

作者： Xin Liu Di Luo Guangshen Lin Zihao Chen Chunfeng Huang Shizhuo Li Chengxian zhang zhenrong zhang Kejin Wei Guangxi Key Laboratory for Relativistic Astrophysics School of Physical Science and TechnologyGuangxi UniversityNanning530004China Guangxi Key Laboratory of Multimedia Communications and Network Technology School of ComputerElectronicsand InformationGuangxi UniversityNanning530004China

Quantum secure direct communication(QSDC)that allows people to directly transmit confidential information through insecure channels is an important branch of quantum *** widespread adoption of the QSDC demands the development of simple and stable ***,most of the existent QSDC systems involve a complex self-alignment process at the initial stage and additional hardware to compensate environmental *** this study,we present a fiber-based QSDC system without active polarization *** system comprises a stable transmitter and a novel Sagnac-Mach-Zehnder interferometer for security *** robust system simplifies the self-alignment and is immune to environmental *** robustness of the system was theoretically and experimentally verified,and low bit error rates in a 12 min continuous operation with an active polarization scrambler were *** addition,we performed a proof-of-principle QSDC demonstration,and a secrecy capacity of 3.43 kbps over a 5 km fiber with a detection bit error rate of 0.85%±0.07%and a quantum bit error rate of 0.42%±0.05%were *** results confirm the viability of the proposed QSDC system for practical applications.

关键词： quantum secure direct communication Sagnac-Mach-Zehnder interferometer without active polarization compensation

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Ultrasonic Degradation of Methyl Orange in Presence of Y2O3 Doping Anatase TiO2 Catalyst

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Journal of Rare Earths 2004年第z1期22卷 160-164页

作者： Wang Jun Guo Baodong Pan Zhijun Liu zhenrong Wen Fuyu zhang Zhaohong Department of Chemistry Liaoning University Shenyang 110036 China Department of Chemistry Liaoning University Shenyang 110036 China Department of Chemistry Liaoning University Shenyang 110036 China Department of Chemistry Liaoning University Shenyang 110036 China Department of Chemistry Liaoning University Shenyang 110036 China Department of Chemistry Liaoning University Shenyang 110036 China

Various affecting factors and degradation mechanism were studied on ultrasonic degradation of methyl orange adopting Y2O3 doping anatase TiO2 catalyst prepared in *** the experiment, the UV-VIS spectrophotometer was used to follow and inspect the degradation process of methyl *** results indicate that the ultrasonic degradation ratios of methyl orange in the presence of anatase TiO2 catalyst are much better than those without ***, the catalytic performance of Y2O3 doping anatase TiO2 catalyst is obviously higher than that of anatase TiO2 catalyst without *** optimal conditions were adopted in this work and the degradation and COD elimination ratio of methyl orange got to98% and 99.0% in 90 min, respectively.

关键词： Y2O3 doping anatase TiO2 catalyst ultrasonic degradation methyl orange rare earths

Practical decoy-state quantum secure direct communication

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Science China(Physics,Mechanics & Astronomy) 2021年第12期64卷 68-75页

作者： Xin Liu Zijian Li Di Luo Chunfeng Huang Di Ma Minming Geng Junwei Wang zhenrong zhang Kejin Wei Guangxi Key Laboratory for Relativistic Astrophysics School of Physical Science and TechnologyGuangxi UniversityNanning 530004China Guangxi Key Laboratory of Multimedia Communications and Network Technology School of ComputerElectronicsand InformationGuangxi UniversityNanning 530004China CAS Quantum Network Co. LtdShanghai 201315China

Quantum secure direct communication(QSDC) has been demonstrated in both fiber-based and free-space channels using attenuated lasers. Decoy-state QSDC by exploiting four decoy states has been proposed to address the problem of photon-numbersplitting attacks caused by the use of attenuated lasers. In this study, we present an analysis of the practical aspects of decoy-state QSDC. First, we design a two-decoy-state protocol that only requires two decoy states, thereby significantly reducing experimental complexity. Second, we successfully perform full parameter optimization for a real-life QSDC system by introducing a genetic algorithm. Our simulation results show that the two-decoy-state protocol could be the best choice for developing a practical QSDC system. Furthermore, full optimization is crucial for a high-performance QSDC system. Our work serves as a major step toward the further development of practical decoy-state QSDC systems.

关键词： quantum secure direct communication decoy-state method full parameter optimization

Shared-p-cycles method for design of survivable WDM networks

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Frontiers of Electrical and Electronic Engineering in China 2009年第4期4卷 362-370页

作者： zhenrong zhang Lixin ZHU Zhengbin LI Anshi XU State Key Laboratory of Advanced Optical Communication Systems&Networks Peking UniversityBeijing 100871China School of Computer Electronics and InformationGuangxi UniversityNanning 530004China

In future high-capacity wavelength division multiplexed(WDM)optical networks,the failure of a network component such as a fiber link can lead to severe disruption in the networks’***,it is imperatively important to provide fast and full protection in WDM optical *** this paper,we propose a new approach,called shared preconfigured protection cycles(shared-p-cycles),for the design of survivable WDM *** develop an integer linear program(ILP)formulation to solve the problem of shared-p-cycles design for WDM networks with and without wavelength *** results show that the shared-p-cycles design is more efficient in the use of spare capacity and requires much less spare capacity than the conventional pcycles design.

关键词： wavelength division multiplexed(WDM)optical networks integer linear program(ILP) p-cycle

Study on syntheses and structures of nine-coordinated mononuclear K[TbⅢ(edta)(H2O)3]·5H2O and binuclear K4[TbⅢ2(Httha)2]·14H2O complexes

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Rare Metals 2003年第4期22卷 241-249页

作者： WANG Jun, LIU zhenrong, zhang Xiangdong, JIA Weiguo, and zhang YangDepartment of Chemistry, Liaoning University, Shenyang 110036, China Department of Chemistry Liaoning University Shenyang 110036

The crystal and molecular structures of the K[Tb^(III)(edta)(H_2O)_3].5 H_2O(edta = ethylenediaminetetraacetic acid) and K_4[Tb^(III)_2(Httha)_2].14 H_2O (ttha =triethylenetetraminehexaacetic acid) complexes have been determined by single-crystal X-raydiffraction analyses. The crystal of the K[Tb^(III)(edta)(H_2O)_3].5 H_2O complex belongs toorthorhombic crystal system and Fdd 2 space group. The crystal data are as follows: a = 1.9373(5)nm, b = 3.5429(10) nm, c = 1.2114(3) nm, V 8.315(4) nm^3, Z= 16, M= 630.35, Dc = 2.014 g cm^(-3), m= 3.683 mm^(-1) and F(000) = 5024. The final Rand wR values are 0.0224 and 0.0557 for 3189 [I> 2.0sigma(I)] unique reflections, and 0.0245 and 0.0567 for all 8206 reflections, respectively. The[Tb^(III)(edta)(H_2O)_3]^- complex anion has a nine-coordinated pseudo-monocapped squareantiprismatic structure in which the nine coordinate atoms, two N and seven O come from one edtaligand and three water molecules. The crystal of the K_4[Tb^(III)_2(Httha)_2].14 H_2O complexbelongs to monoclinic system and P 2(1)/n space group. The crystal data are as follows: a =1.1326(3) nm, b = 2.5675(7) nm, C =2.2076(6) nm, bate = 102.943(5) centre dot, V =6.256(3) nm^3, Z =4, M = 1705.26, Dc = 1.802 g cm^(-3), m = 2.611 mm^(-1) and F(000) = 3424. The final R and wR are0.0339 and 0.0667 for 10699 [I>2.0 sigma (I)] unique reflections, and 0.0543 and 0.0741 for all22190 reflections, respectively. The total complex molecule is composed of two close parts instructure.

关键词： synthesis and structures Tb^(III) edta ttha

Domain structure of hard magnetic NdAlFeCo bulk metallic glass

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Chinese Science Bulletin 2001年第19期46卷 1595-1598页

作者： WEI Bingchen WANG Weihua PAN Mingxiang HAN Baoshan zhang zhenrong HU Wenrui National Microgravity Laboratory Institute of MechanicsBeijing 100080China Institute of Physics and Center for Condensed Matter Physics Chinese Academy of SciencesBeijing 100080China State Key Laboratory of Magnetism Institute of Physics and Center for Condensed Matter PhysicsChinese Academy of SciencesBeijing 100080China

Magnetic domain structure of hard magnetic Nd60Al10Fe20Co10 bulk metallic glass (BMG) has been studied by using magnetic force microscopy. In the magnetic force images it is shown that the exchange interaction type magnetic domains with a period of about 360 nm do exist in the BMG, which is believed to be associated with the appearance of hard-magnetic properties in this system. As the scale of the magnetic domain is much larger than the size of the short-range ordered atomic clusters existing in the BMG, it is believed that the large areas of magnetic contrast are actually a collection of a group of clusters aligned in parallel by strong exchange coupling interaction. After fully crystallization, the BMG exhibits paramagnetism. No obvious magnetic contrast is observed in the magnetic force images of fully crystallized samples, except for a small quantity of ferromagnetic crystalline phase with low coercivity and an average size of 900 nm.

关键词： metallic glass hard magnetism magnetic force microscopy exchange coupling interaction.

Variational Level-set Formulation for Lithographic Source and Mask Optimization

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Journal of Microelectronic Manufacturing 2018年第2期1卷 13-22页

作者： Yijiang Shen zhenrong zhang School of Automation Guangdong University of TechnologyGuangzhouChina510006 School of Computer Electronics and InformationGuangxi UniversityNanningChina530004

This paper addresses the contributing factors in lithographic source and mask optimization,namely,the accuracy of the image formation model and the efficiency of the inverse imaging calculations in the optimization framework.A variational level-set formulation is established to incorporate a distance regularization term and an external *** former maintains a signed-distance profile and the latter minimizes the sum of the mismatches between the printed image and the desired one over all *** the need of reinitialization is eliminated in a principle way securing a stable level-set evolution and accurate computation with a simpler and more efficient numerical *** employ a vector imaging model together with a stratified media model to describe the vector nature of electromagnetic fields propagating in the coupling image *** strategies including computing the convolution operation with Fast Fourier Transform,the electric-field caching technique and the conjugate gradient method are discussed to ease the computation load and improve convergence.

关键词： computational lithography variational level set source and mask optimization coupling image

Recent progress on fabrication, spectroscopy properties, and device applications in Sn-doped CdS micro-nano structures

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Journal of Semiconductors 2024年第9期45卷 7-27页

作者： Bo Cao Ye Tian Huan Fei Wen Hao Guo Xiaoyu Wu Liangjie Li zhenrong zhang Lai Liu Qiang Zhu Jun Tang Jun Liu State Key Laboratory of Dynamic Measurement Technology School of Semiconductors and PhysicsNorth University of ChinaTaiyuan 030051China Shanxi Province Key Laboratory of Quantum Sensing and Precision Measurement North University of ChinaTaiyuan 030051China School of Instrument Science and Technology Xi'an Jiaotong UniversityXi'an 710049China

One-dimensional semiconductor materials possess excellent photoelectric properties and potential for the construction of integrated nanodevices. Among them, Sn-doped CdS has different micro-nano structures, including nanoribbons,nanowires, comb-like structures, and superlattices, with rich optical microcavity modes, excellent optical properties, and a wide range of application fields. This article reviews the research progress of various micrometer structures of Sn-doped CdS, systematically elaborates the effects of different growth conditions on the preparation of Sn-doped CdS micro-nano structures, as well as the spectral characteristics of these structures and their potential applications in certain fields. With the continuous progress of nanotechnology, it is expected that Sn-doped CdS micro-nano structures will achieve more breakthroughs in the field of optoelectronics and form cross-integration with other fields, jointly promoting scientific, technological, and social development.

关键词： Sn-doped CdS micro-nano structure superlattices optical microcavity