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Search Results: 1 - 10 of 118528 matches for " Zhou Hong-Yu "
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Meson exchange effects in elastic $ep$ scattering at loop level and the electromagnetic form factors of the proton
Hong-Yu Chen,Hai-Qing Zhou
Physics , 2013, DOI: 10.1103/PhysRevC.90.045205
Abstract: A new form of two-photon exchange(TPE) effect is studied to explain the discrepancy between unpolarized and polarized experimental data in elastic $ep$ scattering. The mechanism is based on a simple idea that apart from the usual TPE effects from box and crossed-box diagrams, the mesons may also be exchanged in elastic $ep$ scattering by two-photon coupling at loop level. The detailed study shows such contributions to reduced unpolarized cross section ($\sigma_{un}$) and polarized observables ($P_t,P_l$) at fixed $Q^2$ are only dependent on proton's electromagnetic form factors $G_{E,M}$ and a new unknown universal parameter $g$. After combining this contribution with the usual TPE contributions from box and crossed-box diagrams, the ratio $\mu_pG_E/G_M$ extracted from the recent precise unpolarized and polarized experimental data can be described consistently.
Two New Constituents from Artemisia capillaris Thunb.
Hong-Yu Ma,Yi Sun,Yu-Zhi Zhou,Min Hong,Yue-Hu Pei
Molecules , 2008, DOI: 10.3390/molecules13020267
Abstract: Two new compounds, 6′-O-caffeoyl-p-hydroxyacetophenone-4-O-β-D-glucopyranoside(1) and 6-amino-9-[1-(3,4-dihydroxyphenyl)ethyl]-9H-purine (2) wereisolated from the aerial parts of Artemisia capillaris Thunb. The structures wereestablished on the basis of spectral data.
Multiparty-controlled teleportation of an arbitrary m-qudit state with pure entangled quantum channel
Ping Zhou,Xi-Han Li,Fu-Guo Deng,Hong-Yu Zhou
Physics , 2007,
Abstract: We present a general scheme for multiparty-controlled teleportation of an arbitrary m-qudit ($d$-dimensional quantum system) state by using non-maximally entangled states as the quantum channel. The sender performs m generalized Bell-state measurements on her 2$m$ particles, the controllers take some single-particle measurements with the measuring basis $X_{d}$ and the receiver only need to introduce one auxiliary two-level particle to extract quantum information probabilistically with the fidelity unit if he cooperates with all the controllers. All the parties can use some decoy photons to set up their quantum channel securely, which will forbid some a dishonest party to eavesdrop freely. This scheme is optimal as the probability that the receiver obtains the originally unknown m-qudit state equals to the entanglement of the quantum channel.
Generation of Multiphoton Entangled States with Linear Optical Elements

SHENG Yu-Bo,DENG Fu-Guo,ZHOU Hong-Yu,

中国物理快报 , 2008,
Abstract: We propose a linear optical protocol to generate three-photon and four-photon entangled states without resorting to entangled sources. The setup in this protocol is composed of three beam splitters and two half-wave plates. We can obtain three-photon and four-photon entangled states with postselection, as with other protocols. This protocol has the advantage of high efficiency and is more feasible than others.
Efficient polarization entanglement purification based on parametric down-conversion sources with cross-Kerr nonlinearity
Yu-Bo Sheng,Fu-Guo Deng,Hong-Yu Zhou
Physics , 2008, DOI: 10.1103/PhysRevA.77.042308
Abstract: We present a way for entanglement purification based on two parametric down-conversion (PDC) sources with cross-Kerr nonlinearities. It is comprised of two processes. The first one is a primary entanglement purification protocol for PDC sources with nondestructive quantum nondemolition (QND) detectors by transferring the spatial entanglement of photon pairs to their polarization. In this time, the QND detectors act as the role of controlled-not (CNot) gates. Also they can distinguish the photon number of the spatial modes, which provides a good way for the next process to purify the entanglement of the photon pairs kept more. In the second process for entanglement purification, new QND detectors are designed to act as the role of CNot gates. This protocol has the advantage of high yield and it requires neither CNot gates based on linear optical elements nor sophisticated single-photon detectors, which makes it more convenient in practical applications.
Single-photon entanglement concentration for long-distance quantum communication
Yu-Bo Sheng,Fu-Guo Deng,Hong-Yu Zhou
Physics , 2009,
Abstract: We present a single-photon entanglement concentration protocol for long-distance quantum communication with quantum nondemolition detector. It is the first concentration protocol for single-photon entangled states and it dose not require the two parties of quantum communication to know the accurate information about the coefficient $\alpha$ and $\beta$ of the less entangled states. Also, it does not resort to sophisticated single-photon detectors, which makes this protocol more feasible in current experiments. Moreover, it can be iterated to get a higher efficiency and yield. All these advantages maybe make this protocol have more practical applications in long-distance quantum communication and quantum internet.
Efficient and economic five-party quantum state sharing of an arbitrary m-qubit state
Yu-Bo Sheng,Fu-Guo Deng,Hong-Yu Zhou
Physics , 2010, DOI: 10.1140/epjd/e2008-00075-5
Abstract: We present an efficient and economic scheme for five-party quantum state sharing of an arbitrary m-qubit state with $2m$ three-particle Greenberger-Horne-Zeilinger (GHZ) states and three-particle GHZ-state measurements. It is more convenient than other schemes as it only resorts to three-particle GHZ states and three-particle joint measurement, not five-particle entanglements and five-particle joint measurements. Moreover, this symmetric scheme is in principle secure even though the number of the dishonest agents is more than one. Its total efficiency approaches the maximal value.
Efficient polarization entanglement concentration for electrons with charge detection
Yu-Bo Sheng,Fu-Guo Deng,Hong-Yu Zhou
Physics , 2008, DOI: 10.1016/j.physleta.2009.03.051
Abstract: We present an entanglement concentration protocol for electrons based on their spins and their charges. The combination of an electronic polarizing beam splitter and a charge detector functions as a parity check device for two electrons, with which the parties can reconstruct maximally entangled electron pairs from those in a less-entanglement state nonlocally. This protocol has a higher efficiency than those based on linear optics and it does not require the parties to know accurately the information about the less-entanglement state, which makes it more convenient in a practical application of solid quantum computation and communication.
Nonlocal entanglement concentration scheme for partially entangled multipartite systems with nonlinear optics
Yu-Bo Sheng,Fu-Guo Deng,Hong-Yu Zhou
Physics , 2008, DOI: 10.1103/PhysRevA.77.062325
Abstract: We present a nonlocal entanglement concentration scheme for reconstructing some maximally entangled multipartite states from partially entangled ones by exploiting cross-Kerr nonlinearities to distinguish the parity of two polarization photons. Compared with the entanglement concentration schemes based on two-particle collective unitary evolution, this scheme does not require the parties to know accurately information about the partially entangled states--i.e., their coefficients. Moreover, it does not require the parties to possess sophisticated single-photon detectors, which makes this protocol feasible with present techniques. By iteration of entanglement concentration processes, this scheme has a higher efficiency and yield than those with linear optical elements. All these advantages make this scheme more efficient and more convenient than others in practical applications.
Nuclear halo effect on nucleon capture reaction rates at stellar energies
恒星能量下核子俘获反应率的晕核效应

Liu Zu-Hua,Zhou Hong-Yu,
刘祖华
,周宏余

中国物理 B , 2005,
Abstract: 恒星能量下俘获截面很难直接测量。10Be(n,γ)11Be俘获反应涉及到非均匀宇宙大爆炸核合成,无直接测量实验截面数据。利用转移反应10Be(d,p)11Be的渐近归一化系数(ANC)方法,计算了10Be(n,γ)11Be俘获反应截面和反应率。11Be是中子晕核。研究表明,在恒星能量下俘获到晕态的截面和反应率显著增大。
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