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| 1 | Field experiment on a robust hierarchical metropolitan quantum cryptography network显示文摘A hierarchical metropolitan quantum cryptography network upon the inner-city commercial telecom fiber cables is reported in this paper. The seven-user network contains a four-node backbone net with one node acting as the subnet gateway, a two-user subnet and a single-fiber access link, which is realized by the Faraday-Michelson interferometer set-ups. The techniques of the quantum router, optical switch and trusted relay are assembled here to guarantee the feasibility and expandability of the quantum cryptography network. Five nodes of the network are located in the government departments and the secure keys generated by the quantum key distribution network are utilized to encrypt the instant video, sound, text messages and confidential files transmitting between these bureaus. The whole implementation including the hierarchical quantum cryptographic communication network links and the corresponding application software shows a big step toward the practical user-oriented network with a high security level. | XU FangXing CHEN Wei WANG Shuang YIN ZhenQiang ZHANG Yang LIU Yun ZHOU Zheng ZHAO YiBo LI HongWei LIU Dong HAN ZhengFu GUO GuangCan | 2009 | Chinese Science Bulletin2009，54，17： | 40 |
| 2 | Active phase compensation of quantum key distribution system显示文摘Quantum key distribution (QKD) system must be robust enough in practical communication. Besides birefringence of fiber, system performance is notably affected by phase drift. The Faraday-Michelson QKD system can auto-compensate the birefringence of fiber, but phase shift is still a serious problem in its practical operation. In this paper, the major reason of phase drift and its effect on Faraday- Michel- son QKD system is analyzed and an effective active phase compensation scheme is proposed. By this means, we demonstrate a quantum key distribution system which can stably run over 37-km fiber in practical working condition with the long-time averaged quantum bit error rate of 1.59% and the stan- dard derivation of 0.46%. This result shows that the active phase compensation scheme is suitable to be used in practical QKD systems based on double asymmetric interferometers without additional de- vices and thermal controller. | CHEN Wei HAN ZhengFu MO XiaoFan XU FangXing WEI Guo GUO GuangCan | 2008 | Chinese Science Bulletin2008，53，9： | 24 |
| 3 | Multiple stochastic paths scheme on partially-trusted relay quantum key distribution network显示文摘Quantum key distribution (QKD) technology provides proven unconditional point-to-point security based on fundamental quantum physics. A QKD network also holds promise for secure multi-user communications over long distances at high-speed transmission rates. Although many schemes have been proposed so far, the trusted relay QKD network is still the most practical and flexible scenario. In reality, the insecurity of certain relay sections cannot be ignored, so to solve the fatal security problems of partially-trusted relay networks we suggest a multiple stochastic paths scheme. Its features are: (i) a safe probability model that may be more practical for real applications; (ii) a multi-path scheme with an upper bound for the overall safe probability; (iii) an adaptive stochastic routing algorithm to generate sufficient different paths and hidden routes. Simulation results for a typical partially-trusted relay QKD network show that this generalized scheme is effective. | WEN Hao HAN ZhengFu ZHAO YiBo GUO GuangCan HONG PeiLin | 2009 | Science in China(Series F)2009，52，1： | 17 |
| 4 | Quantum entanglement and quantum operation显示文摘It is a simple introduction to quantum entanglement and quantum operations.The authors focus on some applications of quantum entanglement and relations between two-qubit entangled states and unitary operations.It includes remote state preparation by using any pure entangled states,nonlocal operation implementation using entangled states,entanglement capacity of two-qubit gates and two-qubit gates construction. | YE MingYong ZHANG YongSheng GUO GuangCan | 2008 | Science China(Physics,Mechanics & Astronomy)2008，51，1： | 16 |
| 5 | A universal coherent source for quantum key distribution显示文摘We propose a concept of universal coherent source for quantum key distribution. The weak coherent pulse (WCP) and heralded single photon source (HSPS) are the most common photon sources for state-of-art quantum key distribution (QKD). However, there exists a prominent crossover between the maximal secure distance and the secure key generating rate in short and middle distance if one applies these two sources in a practical decoy state quantum key distribution. It is shown that by combining the heralded pair coherent state (HPCS) photon source and the practical decoy state method together, one can not only strengthen the maximal secure transmission distance, but also improve key generat-ing rate at short and medium distance. Moreover, the advancement in key generating is not confined in the particular protocol utilized and can be easily checked for both BB84 and SARG protocol. Finally, we clearly demonstrate how the HPCS-based decoy method works effectively and feasibly by proposing an efficient HPCS-based '1 signal+2 decoy' state method. | ZHANG ShengLi ZOU XuBo LI ChuanFeng JIN ChenHui GUO GuangCan | 2009 | Chinese Science Bulletin2009，54，11： | 15 |
| 6 | Effects of soil drought on photosynthetic traits and antioxidant enzyme activities in Hippophae rhamnoides seedlings显示文摘Water deficit is one of the major limiting factors in vegetation recovery and reconstruction in the semi-arid area of loess hilly regions. Leaf photosynthesis in Hippophae rhamnoides Linn., a common tree grown in this region, decreases under water stress, but the mechanism responsible is not clear. The objective of this study was to investigate the effects of drought stress on photosynthesis and the relationship between photosynthetic variables and soil water contents to help us better understand the photophysiological characteristics of H. rhamnoides under water stress and guide cultivation in the loess hilly region. Here,gas exchange, chlorophyll fluorescence and antioxidant enzyme activity in leaves of 3-year-old saplings of H.rhamnoides grown in pots were tested under eight soil water conditions. When soil water content(RWC) was between 38.9 and 70.5 %, stomatal limitation was responsible for the reduced net photosynthetic rate(PN).When RWC was lower than 38.9 %, nonstomatal limitation was the main factor restricting PN. Moderate water stress improved the water use efficiency(WUE) of the leaf.Water stress significantly influenced fluorescence variables and the antioxidant enzyme system. When RWC was between 38.9 and 70.5 %, nonphotochemical quenching(NPQ) increased and then decreased, indicating that thermal energy dissipation was a significant photoprotection mechanism. Antioxidant enzymes were activated when RWC ranged from 48.3 to 70.5 %; under severe water stress(RWC \ 38.9 %), the antioxidant enzyme system was damaged, the activity of the antioxidant enzymes declined, and membranes were damaged. In the semiarid loess hilly region, RWC between 58.6 and 70.5 % was the economic water threshold value that maintained higher WUE and PN, and the maximum soil water deficit level that could sustain H. rhamnoides was RWC of 38.9 %. | Jingwen Liu Ronghua Zhang Guangcan Zhang Jing Guo Zhi Dong | 2017 | Journal of Forestry Research2017，28，2： | 8 |
| 7 | Frictional behavior during cold ring compression process of aluminum alloy 5052显示文摘The friction is the considerable boundary condition in bulk metal forming.In this paper,the ring compression test was used to evaluate the friction coefficient and factor in Coulomb friction model and Tresca friction model for the plastic deformation of aluminum alloy AA5052.The micro-macro analysis method combining surface morphology and micro-texture was used to explore the friction behaviors in AA5052 cold forming process.In general,the magnitude(μor m)of friction changes before and after a deformation threshold during ring compression.The maximum change rate of the magnitude(μor m)before and after the deformation threshold is close to 18.5%under the present experimental conditions,and the change rate decreases with increasing loading speed.The lubrication using MoS_(2) is better than that using oil at lower speeds(0.15 mm/s,1.5 mm/s),but the lubrications for MoS_(2) and oil are similar at higher speeds(15 mm/s).The surface roughness,three-dimensional topography,and surface texture of compressed ring have a sudden change around the deformation threshold,which deviate from the previous evolution trend.The increased friction after deformation threshold also promotes the formation of sufficient shear strain layer in the subsurface plane of the compressed ring,and then it hinders the formation of the typical deformation textures withβ-oriented line and promotes the appearance of shear textures such as{001}(110),{111}(uvw)and{hkl}{110)textures. | Dawei ZHANG Guangcan YANG Shengdun ZHAO | 2021 | Chinese Journal of Aeronautics2021，34，5： | 6 |
| 8 | High-Q whispering gallery modes in a polymer microresonator with broad strain tuning显示文摘We have reported the high-Q whispering gallery modes(WGMs) in a polydimethylsiloxane(PDMS) optical microresonators with broad tuning range. The PDMS microresonators are fabricated at the center of two collimating fiber tips, which can be controlled by the piezoelectric stage. Through stretching the fiber stem, the tuning range of WGMs are demonstrated more than 50 nm.Further investigations demonstrated that the WGM shift has a high force sensitivity(~ 19.7 pm/μN) of the gravitation when the microcavity is stretched by a weight. The theoretical analysis reveals that the high force sensitivity of polymer microresonator can be used for the weak force or height measurement. | ZHOU ZhongHao SHU FangJie SHEN Zhen DONG ChunHua GUO GuangCan | 2015 | Science China(Physics,Mechanics & Astronomy)2015，58，11： | 6 |
| 9 | A mechanically tuned Kerr comb in a dispersion-engineered silica microbubble resonator显示文摘This paper discusses the developement and investigation of a silica microbubble resonator(MBR) that is optimized to cancel mode dispersion with material dispersion, at a wavelength of approximately 1550 nm and maintain a quality factor of an optical mode as large as 5.4 × 10~7. Benefitting from the near-zero dispersion and high quality factor, a primary optical comb is generated in the MBR using cascaded four-wave mixing processes, which span over 300 nm with several tens of teeth. Furthermore, the frequency comb could be gradually tuned by mechanically stretching the MBR. This tunable Kerr comb has multiple potential applications in precision measurements and sensing applications, such as molecular spectroscopy and ranging. | FangJie Shu PeiJi Zhang YanJun Qian ZhengYu Wang Shuai Wan Chang Ling Zou GuangCan Guo ChunHua Dong | 2020 | Science China(Physics,Mechanics & Astronomy)2020，63，5： | 5 |
| 10 | Subdiffraction optical manipulation of the charge state of nitrogen vacancy center in diamond显示文摘As a potential candidate for quantum computation and metrology,the nitrogen vacancy(NV)center in diamond presents both challenges and opportunities resulting from charge-state conversion.By utilizing different lasers for the photon-induced charge-state conversion,we achieved subdiffraction charge-state manipulation.The charge-state depletion(CSD)microscopy resolution was improved to 4.1 nm by optimizing the laser pulse sequences.Subsequently,the electron spin-state dynamics of adjacent NV centers were selectively detected via the CSD.The experimental results demonstrated that the CSD can improve the spatial resolution of the measurement of NV centers for nanoscale sensing and quantum information. | Xiangdong Chen Changling Zou Zhaojun Gong Chunhua Dong Guangcan Guo Fangwen Sun | 2015 | Light(Science & Applications)2015，4，1： | 4 |
| 11 | Simulation of the Ising model, memory for Bell states and generation of four-atom entangled states in cavity QED显示文摘A scheme is proposed to simulate the Ising model and preserve the maximum entangled states (Bell states) in cavity quantum electrodynamics (QED) driven by a classical field with large detuning. In the strong driving and large-detuning regime, the effective Hamiltonian of the system is the same as the standard Ising model, and the scheme can also make the initial four Bell states of two atoms at the maximum entanglement all the time. So it is a simple memory for the maximal entangled states. The system is insensitive to the cavity decay and the thermal field and more immune to decoherence. These advantages can warrant the experimental feasibility of the current scheme. Furthermore, the genuine four-atom entanglement may be acquired via two Bell states through one-step implementation on four two-level atoms in the strong-driven model, and when two Greenberger-Horne-Zeilinger (GHZ) states are prepared in our scheme, the entangled cluster state may be acquired easily. The success probability for the scheme is 1. | ZHANG YingJie XIA YunJie MAN ZhongXiao GUO GuangCan | 2009 | Science China(Physics,Mechanics & Astronomy)2009，52，5： | 4 |
| 12 | Risk Analysis of Big Data Based on Cloud Computing for the Inspection and Testing of Toxic and Hazardous Substances in Meat Products显示文摘Large-scale data emerge in food safety inspection and testing industry with the development of Internet technology in China.This paper was aimed at designing toxic and hazardous substance big data risk analysis algorithm in food safety inspection and testing based on cloud computing^([1]).Cloud computing platform was set up to store the massive extensive data with geographical distribution,dynamic and high complexity from the Internet,and MapReduce^([2]) computational framework in cloud computing was applied to process and compute parallel data.The risk analysis results were obtained by analyzing 1000000 meat products testing data collected from the laboratory management information system based on web.The results show that food safety index IFS < 1,which proves that the food safety state is in good condition. | Yajie WANG Jinlin HE Peng WANG Jiao DAI Bing YANG Hong TAN Guangcan TAO | 2017 | Asian Agricultural Research2017，9，8： | 4 |
| 13 | Mechanical and electrical characteristics of cymbal transducer显示文摘The electromechanical of Cymbal transducer has been researched. Under simple supporting condition, the mechanical and electrical characteristics have been analyzed by using Piezoelectric-elastic theory, Kirchhoff 's thin shell vibration theory, Rayleigh-Ritz's theory and equivalent circuit method. The approximate solution and series resonance frequency equation have been given. Under no load, equivalent circuit, correlation parameters of cymbal transducer and the relations between the ratio of cavity depth to radius of Cymbal transducer with resonance frequency, electromechanical coupling coefficient of cymbal transducer have been researched. The best electromechanical coupling coefficient of cymbal transducer has been gained from the results of numerical analysis. It offers a valid theoretical foundation for optimum design of cymbal transducer. | WANG Guangcan ZHANG Jin TIAN Wenjie LIN Guoguang LIAN Guandong ZHANG Fuxue | 2005 | Chinese Journal of Acoustics2005，24，4： | 3 |
| 14 | BiVO 4 /TiO 2 nanocrystalline heterostructure: A wide spectrum responsive photocatalyst towards the highly efficient decomposition of gaseous benzene显示文摘 | Yin Hu Danzhen Li Yi Zheng Wei Chen Yunhui He Yu Shao Xianzhi Fu Guangcan Xiao | 2011 | Applied Catalysis B, Environmental2011，，1： | 3 |
| 15 | Effects of drought stress on the photosynthetic physiological parameters of Populus 3 euramericana ‘‘Neva''显示文摘Populus 9 euramericana ‘‘Neva'' is the main poplar species in China, where drought stress is becoming extremely urgent. We carried out this research to study the effects of drought stress on the photosynthesis of Populus 9 euramericana ‘‘Neva''. Drought stress was induced by 58–62%(light), 48–52%(moderate), and 38–42%(severe) relative soil moisture content(RSMC). The effects of drought stress on photosynthetic rate, chlorophyll fluorescence parameters, and other related physiological parameters were investigated during treatment. Net photosynthetic rate(PN), and stomatal conductance decreased significantly and intercellular CO_2 concentration initially increased and then declined, whereas the stomatal limitation factors showed opposite trends in the light under moderate drought stress. Photosystem II(PSII) maximum photochemical efficiency, actual photochemical efficiency,and photochemical quenching decreased gradually under drought stress, whereas nonphotochemical quenching initially increased and then declined. Superoxide dismutase,peroxidase, and catalase activities initially increased and then decreased as RSMC was reduced, whereas malondialdehyde(MDA) content and relative electric conductivity(REC) increased gradually. These results suggest that stomatal factors accounted for the decline in PNunder light and moderate drought stress, whereas leaf PNdecreased mainly due to non-stomatal factors under severe drought stress. PSII was damaged; thus, photosynthetic electron transfer was restricted, indicating that heat dissipation is important for the light protection mechanism of plants.Antioxidant enzymes increased at the beginning of treatment, and the increased MDA and REC led to cell membrane damage. These results suggest that poplar seedlings stabilized their photosynthetic apparatus by reducing the light trapping ability under light and moderate drought stress conditions. This helped dissipate heat and enhance antioxidant enzyme activity. Stomatal factors accounted for the decline in P_N, whereas damage to PSII and antioxidant enzymes under severe drought stress suggested that the decline in P_N was caused by non-stomatal restrictive factors. | Guoting Liang Jianwen Bu Shuyong Zhang Guo Jing Guangcan Zhang Xia Liu | 2019 | Journal of Forestry Research2019，30，2： | 3 |
| 16 | Effects on type 2 diabetes complicated with pulmonary tuberculosis:regiment of insulin,isoniazid,rifampicin,pyrazinamide and ethambutol versus the regiment plus Qi-boosting and Yin-nourishing decoction of Traditional Chinese Medicine显示文摘OBjECTIVE:To observe the clinical effect on type 2diabetes mellitus(T2DM) complicated with pulmonary tuberculosis(TB) of insulin,isoniazid,rifampicin,pyrazinamide and ethambutol(conventional medication) administered together with Qi-boosting and Yin-nourishing decoction derived from Traditional Chinese Medicine(TCM).METHODS:A total of 60 patients with T2 DM complicated with pulmonary TB were randomly and equally divided into positive control group and treatment group.The control group was treated with Western conventional regiment(WCR):insulin,isoniazid,rifampicin,pyrazinamide,and ethambutol,whereas the treatment group was given both WCR and Qi-boosting and V/n-nourishing decoction prepared from TCM.RESULTS:After the treatment,20(66.7%) and 11(36.7%) cases showed sputum bacteria negative conversion in the WCR plus TCM group and WCM group respectively(P < 0.05).A total of 25(83.3%)and 18(60%) cases showed improvement in lung lesion in the WCR plus TCM group and WCM group respectively(P < 0.05).Compared with WCR group,fasting plasma glucose and 2-hour postprandial blood glucose levels in the WCR plus TCM group significantly decreased(P < 0.05 and P < 0.01,respectively).CONCLUSION:Qi-boosting and Yin-nourishing decoction combined with the Western medication showed better curative effect in treating T2 DM complicated with pulmonary TB compared with the group using the conventional Western Medicine alone. | Shi Guangcan Zhang Ligong | 2015 | Journal of Traditional Chinese Medicine2015，35，3： | 3 |
| 17 | Interconversion of photon-phonon in a silica optomechanical microresonator显示文摘In an optomechanical resonator, the optical and mechanical excitations can be coherently converted, which induces a transparency window for a weak probe laser beam. Here, we report an experimental study of transient optomechanically induced transparency(OMIT) using the silica microsphere with the breathing modes. The transient OMIT behavior obtained are in good agreement with theoretical calculations. In addition, the coherent interconversion between optical and mechanical excitations that can be used for light storage and readout has also been studied here. Our experimental results indicate that the light storage is closely related to the process of OMIT, and the photon-phonon conversion can be further applied to optical wavelength or optical mode conversion. | DONG ChunHua SHEN Zhen ZOU ChangLing GUO GuangCan | 2015 | Science China(Physics,Mechanics & Astronomy)2015，58，5： | 3 |
| 18 | Safety Assessment and Distribution Characteristics of Heavy Metal Pollutants in Livestock and Poultry Meat from Different Regions of China显示文摘[Objective] To analyze and compare the heavy metal inspection results of different livestock and poultry meat from different farms,wholesale markets,farmers' markets and supermarkets in different areas of China,in order to evaluate the health risks of livestock and poultry meat.[Method] A total of 10 500 samples of 5 kinds of livestock and poultry meat were collected in North China,Northeast China,East China,Central China,South China,Southwest China and Northwest China during 2015-2017.The samples were analyzed and evaluated with the method of index of food safety( IFS).[Result]the average over-standard rates of Pb,Cd,Cr,Hg and As in samples were 1.10%-2.48%,0.67%-2.48%,1.00%-2.57%,0.81%-1.43% and 0.43%-1.00%,respectively,and the index of food safety was less than 1.The pollution levels of Pb,Cd,Cr,Hg and As in livestock and poultry meat in Southwest China were higher than those in other areas,while the pollution of As in Northeast China was severer than that in other areas.The order of IFS values of different heavy metals in different livestock and poultry meat was the same.[Conclusion] The index of food safety showed that the risk of heavy metal pollution in livestock and poultry meat did not exceed the acceptable limit. | Yajie WANG Heng TAO Kai CHEN Hu XIA Jinlin HE Guangcan TAO | 2019 | Asian Agricultural Research2019，11，1： | 3 |
| 19 | Probabilistic Teleportation and Entanglement Matching显示文摘 | LI Wanli LI Chuanfeng GUO Guangcan | 2000 | Physical Review A2000，，03： | 1 |
| 20 | Efficient Scheme for Two-Atom Entanglement and Quantum Information Processing in Cavity QED显示文摘 | ZHENG Shibiao GUO Guangcan | 2000 | Phys Rev lett2000，85，： | 1 |
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