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Search Results: 1 - 10 of 53976 matches for " Guang-Ping He "
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Quantum Anti-Piracy Storage of Classical Data
Guang-Ping He
Physics , 2005,
Abstract: A scheme is proposed which stores classical data in 4-state quantum registers. It can achieve the following goal: the classical data can always be read unambiguously, while the quantum registers cannot be copied. Therefore the data provider can always distinguish the original quantum registers from piracy copies. Examples of application are also given.
Quantum Bit Commitment Using Entangled States
Guang-Ping He
Physics , 2003,
Abstract: Based on the fact that the entanglement can not be created locally, we proposed a quantum bit commitment protocol, in which entangled states and quantum algorithms is used. The bit is not encoded with the form of the quantum states, and delaying the measurement is required. Therefore the protocol will not be denied by the Mayers-Lo-Chau no-go theorem, and unconditional security is achieved.
Quantum bit string sealing
Guang-Ping He
Physics , 2005, DOI: 10.1142/S0219749906002079
Abstract: Though it was proven that secure quantum sealing of a single classical bit is impossible in principle, here we propose an unconditionally secure quantum sealing protocol which seals a classical bit string. Any reader can obtain each bit of the sealed string with an arbitrarily small error rate, while reading the string is detectable. The protocol is simple and easy to be implemented. The possibility of using this protocol to seal a single bit in practical is also discussed.
Upper bounds of a class of imperfect quantum sealing protocols
Guang-Ping He
Physics , 2005, DOI: 10.1103/PhysRevA.71.054304
Abstract: The model of the quantum protocols sealing a classical bit is studied. It is shown that there exist upper bounds on its security. For any protocol where the bit can be read correctly with the probability $\alpha $, and reading the bit can be detected with the probability $\beta $, the upper bounds are $% \beta \leqslant 1/2$ and $\alpha +\beta \leqslant 9/8$.
The relationship between two flavors of oblivious transfer at the quantum level
Guang-Ping He,Z. D. Wang
Physics , 2005, DOI: 10.1103/PhysRevA.73.044304
Abstract: Though all-or-nothing oblivious transfer and one-out-of-two oblivious transfer are equivalent in classical cryptography, we here show that due to the nature of quantum cryptography, a protocol built upon secure quantum all-or-nothing oblivious transfer cannot satisfy the rigorous definition of quantum one-out-of-two oblivious transfer.
Testing Bell's inequality and measuring the entanglement using superconducting nanocircuits
Guang-Ping He,Shi-Liang Zhu,Z. D. Wang,Hua-Zhong Li
Physics , 2003, DOI: 10.1103/PhysRevA.68.012315
Abstract: An experimental scheme is proposed to test Bell's inequality by using superconducting nanocircuits. In this scheme, quantum entanglement of a pair of charge qubits separated in a sufficient long distance may be created by cavity quantum electrodynamic techniques; the population of qubits is experimentally measurable by dc currents through the probe junctions, and one measured outcome may be recorded for every experiment. Therefore, both locality and detection efficiency loopholes should be closed in the same experiment. We also propose a useful method to measure the amount of entanglement based on the concurrence between Josephson qubits. The measurable variables for Bell's inequality as well as the entanglement are expressed in terms of a useful phase-space Q function.
Conductance of a Quantum Point Contact in the presence of a Scanning Probe Microscope Tip
Guang-Ping He,Shi-Liang Zhu,Z. D. Wang
Physics , 2002, DOI: 10.1103/PhysRevB.65.205321
Abstract: Using the recursive Green's function technique, we study the coherent electron conductance of a quantum point contact in the presence of a scanning probe microscope tip. Images of the coherent fringe inside a quantum point contact for different widths are obtained. It is found that the conductance of a specific channel is reduced while other channels are not affected as long as the tip is located at the positions correspending to that channel. Moreover, the coherent fringe is smoothed out by increasing the temperature or the voltage across the device. Our results are consistent with the experiments reported by Topinka et al.[Science 289, 2323 (2000)].
A Density Functional Theory Study on the Deformation Behaviors of Fe-Si-B Metallic Glasses
Guang-Ping Zheng
International Journal of Molecular Sciences , 2012, DOI: 10.3390/ijms130810401
Abstract: Density functional theory has been employed to investigate the deformation behaviors of glassy Fe-Si-B model systems prepared by ab initio molecular dynamics. The atomistic deformation defects which are closely related to the local dilation volumes or excess volumes and unstable bonding have been systematically analyzed. It has been found that the icosahedral structures are relatively stable under shear deformation until fracture occurs. Plastic flow is indicated by interruption of percolating icosahedral structures, caused by unstable Fe-Si bonding of p- s hybridization in nature.
Development of a Rapid and Simple Non-Derivatization Method to Determine Constituents and Antioxidative Capacity of Camellia Oils by HPTLC  [PDF]
Guang-Ping Lv, Meijun Aoli, Bin Zhou, Jing Zhao
Food and Nutrition Sciences (FNS) , 2013, DOI: 10.4236/fns.2013.48A025
Abstract: Camellia oil is an edible vegetable oil with high value of nutrition and health protection function such as antioxidant and adjusting blood fat. In this study, a simple, rapid and effective HPTLC method was developed for analyzing the composition and antioxidant constituents of camellia oil. The HPTLC was performed on G60 plate with n-hexane-diethyl ether-acetic acid (6:4:0.1, v/v/v) as mobile phase combined with two coloration methods (ethanol containing 10% phosphomolybdic acid, ethanol containing 0.03% DPPH) and scanning densitometry technique. The unsaturated fatty glyceride, free fatty acids, sterols and lipids including triolein, oleic acid, ergosterin, β-sitosterol, tocopherol and phospholipids in camellia oils were determined and performed densitometrically at λs1 = 620 nm and λs2 = 517 nm. The results show that the main components of different samples of camellia oil are similar, however the contents are diverse. The antioxidative test shows that camellia oil has obvious antioxidant capability as olive oil, especially the pressed virgin oil. Therefore, this non-derivatization HPTLC method can be used for composition and antioxidative capacity determination of camellia oils.
Optimal control of under-actuated redundant space-robot system

HE Guang-ping,LU Zhen,WANG Feng-xiang,

控制理论与应用 , 2004,
Abstract: The underactuated control is an important aspect of the fault tolerance technology in space field. In this paper the optimal motion planning and control method are studied for the underactuated redundant space robot system with passive joints equipped with lockers. The optimizing ability and control method for such a system are analyzed on the basis of dynamic equations. A coupling index between the actuated and passive joints is introduced and an optimizing control algorithm is proposed, which is called the virtual model lead control method (VMLCM). By this method, a fully actuated manipulator that structurally is equivalent to the underactuated one is used as the virtual model to plan the motion, and the underactuated manipulator approximates the planned trajectory in the space of joint. Therefore, the algorithm can drive the manipulator to track a desired trace and improve the tracking accuracy. A three DOFs planar robot with passive end joint is used for simulation, and the simulation results justify the proposed algorithm.
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