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| 1 | Dense coding scheme using superpositions of Bell-states and its NMR implementation显示文摘Dense coding using superpositions of Bell-states is proposed. The generalized Grover's algorithm is used to prepare the initial entangled states, and the reverse process of the quantum algorithm is used to determine the entangled state in the decoding measurement. Compared with the previous schemes, the superpositions of two Bell-states are exploited. Our scheme is demonstrated using a nuclear magnetic resonance (NMR)quantum computer. The corresponding manipulations are obtained. Experimental results show a good agreement between theory and experiment. We also generalize the scheme to transmit eight messages by introducing an additional two-state system. | ZHANG Jingfu, XIE Jingyi, DENG Zhiwei & LU Zhiheng Key Laboratory for Quantum Information and Measurements, Department of Physics, Tsinghua University, Beijing 100084, China Center for Quantum Information, Tsinghua University, Beijing 100084, China Department of Materials Science and Engineering, Beijing Normal University, Beijing 100875, China Testing and Analytical Center, Beijing Normal University, Beijing 100875, China Department of Physics, Beijing Normal University, Beijing 100875, China | 2005 | Science China(Physics,Mechanics & Astronomy)2005，48，1： | 18 |
| 2 | Entropy product measure for multipartite pure states显示文摘An entanglement measure for multipartite pure states is formulated using the product of the von Neumann entropy of the reduced density matrices of the constituents. Based on this new measure, all possible ways of the maximal entanglement of the triqubit pure states are studied in detail and all types of the maximal entanglement have been compared with the result of ‘the average entropy’. The new measure can be used to calculate the degree of entanglement, and an improvement is given in the area near the zero entropy. | CAO Wancang1,2, LIU Dan2, PAN Feng3 & LONG Guilu2,4 1. Department of Physics, Chifeng College, Chifeng 024001, China 2. Key Laboratory for Quantum Information and Measurements, Department of Physics, Tsinghua University, Beijing 100084, China 3. Department of Physics, Liaoning Normal University, Dalian 116029, China 4. Key Laboratory for Atomic and Molecular Nano-Sciences, Tsinghua University, Beijing 100084, China Correspondence should be addressed to Long Guilu | 2006 | Science China(Physics,Mechanics & Astronomy)2006，49，5： | 8 |
| 3 | Implementation of a multiple round quantum dense coding using nuclear magnetic resonance显示文摘A multiple round quantum dense coding scheme based on the quantum phase estimation algorithm is proposed and implemented in a three qubit nuclear magnetic resonance (NMR) quantum computer. Using an m + 1 qubit system, Bob can transmit one of 2m+1 messages to Alice, through manipulating only one qubit and exchanging it between Alice and Bob for m rounds. The information capacity is enhanced to m + 1 bits as compared to m bits in a classical scheme. The scheme has been demonstrated in NMR system, and the experimental results show a good agreement between theory and experiment. | ZHANG Jingfu1, XIE Jingyi2, WANG Chuan1, DENG Zhiwei3, LU Zhiheng4, & LONG Guilu1,5 1. Key Laboratory For Quantum Information and Measurements of MOE, Department of Physics, Tsinghua University, Beijing 100084,China 2. Department of Materials Science and Engineering, Beijing Normal University, Beijing 100875, China 3. Testing and Analytical Center, Beijing Normal University, Beijing 100875,China 4. Department of Physics, Beijing Normal University, Beijing 100875, China 5. Key Laboratory For atomic and Molecular Nanosciences, Tsinghua University, Beijing 100084,China | 2005 | Science China(Physics,Mechanics & Astronomy)2005，48，6： | 8 |
| 4 | Observations favor the crossing of phantom divide lines显示文摘Using three different parameterized dark energy models, we reconstruct the properties of dark energy from the latest 397 Sne Ia, CMB and BAO with the present matter density, Ωm0, given prior. We find that, when Ωm0 is not small, for example, Ωm0 = 0.28 or 0.32, an evolving dark energy with a crossing of phantom divide line is favored and this conclusion seems to be model independent. We also find that the evolving properties of dark energy become more and more evident with the increase of Ωm0 given prior. | HUANG TieTie1,2,3, WU PuXun2,3 & YU HongWei2,3 1Department of Physics, Xiangnan College, Chenzhou 423000, China 2Department of Physics and Institute of Physics, Hunan Normal University, Changsha 410081, China 3Key Laboratory of Low Dimensional Quantum Structures and Quantum Control of Ministry of Education, Hunan Normal University, Changsha 410081, China | 2010 | Science China(Physics,Mechanics & Astronomy)2010，53，3： | 6 |
| 5 | Electronic structures of phosphorus-doped diamond films and impacts of their vacancies显示文摘In order to better understand the bonding mechanisms of the phosphorus-doped diamond films and the influences of the phosphorus-doped concentration on the diamond lattice integrity and conductivity,we calculate the electronic structures of the phosphorus-doped diamond with different phosphorus concentrations and the density of states in the phosphorus--doped diamond films with a vacant lattice site by the first principle method.The calculation results show the phosphorus atom only affects the bonds of a few atoms in its vicinity,and the conductivity increases as the doped concentration increases.Also in the diamond lattice with a total number of 64 atoms and introducing a vacancy into the non-nearest neighbor lattice site of a phosphorus atom,we have found that both the injuries of the phosphorus-doped diamond films and the N-type electron conductivity of diamond films could be improved. | WANG GangWen 1 & SHAO QingYi 1,2* 1 Laboratory of Quantum Information Technology,School of Physics and Telecommunication Engineering,South China Normal University,Guangzhou 510006,China 2 Department of Physics,Zhangzhou Normal University,Zhangzhou 363000,China | 2010 | Science China(Physics,Mechanics & Astronomy)2010，53，7： | 6 |
| 6 | A Breather in Birefringent Fibers显示文摘The propagation properties of the breather in birefringent fibers are investigated. The breather can propagate stably in strongly birefringent fibers. The propagation law can be expected. However, random birefringence makes the propagation of the breather more complex. The breather will partly disappear and partly appear, even may split into two smaller breathers. In addition, the varying range of relative time displacement between two components of the breather becomes narrower with the effect of third-order dispersion. If third order dispersion is too strong, the breather behavior will disappear gradually during the transmission. The breather can exist in random birefringent fiber with dispersion management rather than in strongly birefringent fiber. | CHEN Wei cheng 1,2 , XU Wen cheng 1 (1.Dept. of Phys., Foshan University, Foshan 528000, CHN 2.Inst. of Quantum Electron., South China Normal University, Guangzhou 510631, CHN) | 2002 | Semiconductor Photonics and Technology2002，8，4： | 4 |
| 7 | Production and measurement of Bose-Einstein condensate of ^(87)Rb atomic gas显示文摘The research platform for Bose-Einstein condensate in 87 Rb atomic gas,which is composed of a double MOT configuration and a QUIC trap,was reported.The properties of the condensate were measured both in time-of-flight and in tight confinement by the absorption imaging method.The measurements agreed with the criterions of Bose-Einstein condensation phase transition.About 2×10 5 atoms were pure condensed. | XU Zhen ,ZHOU ShuYu,ZHOU ShanYu&WANG YuZhu Key Laboratory for Quantum Optics,Shanghai Institute of Optics and Fine Mechanics,Chinese Academy of Sciences,Shanghai 201800,China | 2008 | Science China(Physics,Mechanics & Astronomy)2008，51，1： | 3 |
| 8 | Experimental realization of quantum cryptography communication in free space显示文摘Utilizing linear optical devices, the principle of B92 quantum key distribution (QKD) protocol is demonstrated in free space with a distance of transmission of 2.2 meters. The faint laser pulses with 650 nm wavelength are used as the single photon sources. The experimental results show that the eavesdropping behavior in the signal transmission can be detected. We also discuss the problems and solutions in using the quantum cryptography communication practically. It is pointed out that one of the approaches to increasing the distance of the quantum communication is to overcome the attenuation of the single photon in transmission. This could not be solved by the use of single photon source, and new quantum communication protocols are needed to solve these problems. | WANG Chuan1, ZHANG Jingfu1, WANG Pingxiao1, DENG Fuguo1, AI Qing1 & LONG Guilu1,2 1. Department of Physics, Key Laboratory for Quantum Information and Measurements, Tsinghua Univer- sity, Beijing 100084, China 2. Center for Atomic and Molecular NanoSciences, Tsinghua University, Beijing 100084, China | 2005 | Science China(Physics,Mechanics & Astronomy)2005，48，2： | 2 |
| 9 | 3 dB显示文摘 | M Mehmet S Ast T Eberle : Squeezed light at 1550 nm with a quantum noise reduction of 12 | 2011 | Opt Lett2011，19，25： | 1 |
| 10 | Design of a nonlinear disturbance observer 显示文摘 | LISA Pathfinder drag-free control Classical and Quantum Gravity Chen X K Komada S Fukuda T | 2000 | IEEE Transactions on Industrial Electronics2000，47，2： | 1 |
| 11 | The Holographic study for the high T_c superconductor YBCO and recent development of studies of a class of inverse problems显示文摘A dream or interesting problem is to obtain more information based on one measurement,for example to obtain all the thermodynamic functions based on specific heat only. We call it'holographic'study.After more than 10 year's efforts,we suggest one possibility(or only one)is to solve an inverse problem(specific heat-phonon spectrum inversion,SPI).In this talk we will review recent development of studies of a class of inverse problems,including Dai's exact solution and Chen's formula and their unification.T... | DAI Xian-xi JI Feng-min HE Yuan XIANG Xiang (Research Group of Quantum Statistics and Method of Theoretical Physics,Department of Physics,Fudan University,Shanghai 200433,China) | 2007 | 功能材料信息2007，4，5： | 1 |
| 12 | 显示文摘 | quantum size effects and photophysical properties | 1991 | J Phys Chem1991，95，： | 1 |
| 13 | (QNNs) : inherently fuzzy feedforward neural networks显示文摘 | PURUSHOTHAMAN G Quantum neural networks KARAYIANNIS N B | 1997 | Neural Networks IEEE Transactions on1997，8，3： | 1 |
| 14 | Studying the interaction between dots and Nile blue by absorpt ence and resonance Rayleigh scatte and CdTe ion, ringspectra显示文摘 | You-Qiu quantum fluoresc Juan-Juan Peng Shao-Pu Liu Lei Wang He | 2010 | SpectrochimicaActaPart A:2010，75，5： | 1 |
| 15 | 查看详情显示文摘 | Quantum Coherence | | 0，，7198： | 1 |
| 16 | Storage of an Optical Packet in the EIT Medium显示文摘Based on the Dark State Polariton (DSP) theory, a full numerical simulation of an optical packet's trapping and retrieval procedure in the Electromagnetically Induced Transparency (BIT) medium is first presented here by us. | Shuguang Zhu, Yu Zhang, Xuzong Chen, Anshi XuNational Laboratory on Local Fiber-Optic Communication Network & Advanced Optical Communication Systems, Department of Electronics, Peking University, P.R.China, Tel: 86-10-62755136, Fax: 86-10-62751763E-mail: zhusgaung@sina.comEducation Ministry’ sKey Laboratory for Quantum Information and Measurents of, Department of Electronics, Peking University, P.R.China, Tel: 86-10-62756536, E-mail: pkuzhangyu@hotmail.com | 2003 | 光学学报2003，23，S1： | 1 |
| 17 | 2 μm wavelength lasers显示文摘 | D Schlenker T Miyamoto Z Chen : Growth of highly strained GalnAs/GaAs quantum wells for 1 | 2000 | J Cryst Growth2000，209，1： | 1 |
| 18 | 2 μm wavelength lasers显示文摘 | D Schlenker T Miymoto Z Chen : Growth of highly strained GalnAs/GaAs quantum wells for 1 | 2000 | J Cryst Growth2000，209，1： | 1 |
| 19 | Environ显示文摘 | HARDMAN R A toxicologic review of quantum dots:toxic ity depends on physicochemical and environmental factors | 2006 | Health Perspect2006，114，2： | 1 |
| 20 | Chemical based screening of ionic liquids for the extraction of phenol from aqueous solution显示文摘 | Mohanty S Banerjee T Quantum KM | 2010 | Ind Eng Chem Res2010，49，： | 1 |
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