Plasma photonic crystal is a combinative production of plasma subject and photonic crystal subject. It not only shows photonic band gaps and local characteristics of conventional photonic crystals, but also has physical characteristics of plasma. The unique property of plasma photonic crystal is the tunable band gaps by plasma parameters as well as external magnetic field. If appropriate defects are introduced in plasma photonic crystals, tunable filters and waveguides can be formed and have important application in engineering. Combined with the research of our group, the process and prospect of one-dimensional and two-dimensional plasma photonic crystals are summarized, respectively, which would provide guidance for further studying on plasma photonic crystals.

Traditional algorithms can result in the blurring or zigzag on edges in the image zooming. A new method for image zooming is presented which focuses on the triangulation of the pixels in the rectangle mesh. The accessorial control points associated with the undetermined curves can be presented by the position and distance of the interrelated pixels. The Bézier curves, which interpolate the accessorial control points, are used to construct the Coons surface via boundary. The new method can preserve and intensify the edge characters of the image. Especially, the edge characters in the gradient or sharp-angled area can be preserved better.

A method to generate a broadband water window continuum high-order harmonic generation spectra is proposed using a few-cycle two-color driving pulse synthesized by 2000 nm mid-infrared laser driving field and its much weaker 1000 nm second harmonic modulation field. In the scheme, the ionization step can be modulated by the weaker second harmonic, which not only broadens the bandwidth but also enhances the yields of the continuum harmonics. By solving time-dependent Schr?dinger equation based on one-dimensional helium atom model, it is found that a broadband continuum harmonic spectrum with bandwidth of 190 eV is observed and the yield of the continuum harmonics is increased by two orders compared with one-color 2000 nm driving field alone. Furthermore, adjusting the carrier envelop phase between the two-color field can enhance the contribution of one ionization trajectories and simultaneously suppress the other one, from which an isolated 70 as pulse can be obtained.

The complexity of the heat exchange equation brings difficulties to study laser-damage etc. A kind of stochastic method which treats the energy input and redistribution process as a chemical kinetics problem is used, and the thermal physical model is established. Based on stochastic method, the 2D distribution of temperature is studied by Gauss beam with 5 μm radius and 647 nm wavelength. The relationship of the temperature with irradiated time is obtained, and the effects on distribution of temperature are discussed about the variety of reflectance, absorption coefficient, thermal capacity and thermal conductance with temperature. The results indicate that stochastic method is reasonable to treat heat exchange, and the average of reflectance and thermal capacity can be used to improve simulating efficiency under the melting point of silicon.

The threshold value of Svetlichny inequality of three-qubit W states was calculated. The analytic expression of nonlocality for W states was introduced. And the relation between three body entanglement and nonlocality was investigated. The results show that three-qubit W states have unique three body entanglement and nonlocality. These results will provide theoretical foundation for the further research of entanglement feature and entanglement dynamics of W states.

The dynamics of quantum discord (QD) is investigated in the two-qubit Ising system in an inhomogeneous magnetic field with the Dzialoshinskii-Moriya (DM) interaction. The system is initially prepared in the Werner state, and the effects of the DM interaction, degree of inhomogeneous magnetic field and purity of the initial state on QD and entanglement in the evolution process are analyzed in detail. By comparison, it is found that both the quantum discord and entanglement take similar behaviors to a large extent, and QD does not vanish in the finite time, but the phenomenon of entanglement sudden death (ESD) appears during the evolution process. This difference shows that the quantum discord is more practical than the entanglement to evaluate the quantum correlation. These effects also indicate that one can control the quantum discord of the system by some exterior conditions.

A quantum signaling layered model with analysis of the function of each layer is presented. Based on the signaling transmission and exchange situations between quantum mobile and fixed network, the implementation strategy of entanglement distribution layer function is studied. The results show that each layer of the proposed quantum model has perfect function. It not only meets the future needs of multi-user quantum communication, but also has a good generality. The strategy of the distribution layer functions can adapt to all situations between different quantum communication networks. The result provides technical support for the quantum signaling standards in the future.

The quantum effects of the general quantized mesoscopic RLC parallel circuit were studied based on the thermal field dynamics theory. The quantum fluctuations of the voltage and current in each branch which depended on the factors such as the elements of circuit, thermal vaccum state and time were analyzed. The results show that the quantum fluctuations in each brand are affected by all the three factors when the quantized mesoscopic circuit is in the thermal vaccum state. The fluctuations decay with time exponentially, but the decay rate have relation to the elements of the circuit only. The amplitude of the fluctuations at the initial moment is dependent on the elements of the circuit and temperature of the thermal vaccum state.

A scheme is proposed for remotely preparing a two-qubit state by using four-qubit cluster state as the quantum channel. In the scheme, the success probability of preparation and classical communication cost are calculated. In general, Bob can successfully prepare the target state with the probability 1/4 and consume only 1/4 bits classical communication. However, if the state belongs to six special situations, the success probability of preparation can reach 1/2 or even 1 after consuming some extra bits.

Quantum information transfer is one of the important branches in quantum infromation. Based on the single state quantum information transfer in spin chain, the transfer of two and three states information in spin chain are discussed in detail, and then the scheme is expanded to the arbitrary n states furthermore. Finally, the probability formula of the quantum information of the arbitrary n-state transfers in spin chain is obtained, and the condition that the arbitrary n-state information can be transferred perfectly in spin chain is given as well. Accordingly, a reasonable theoretical scheme is offered for the perfect transfer of the arbitrary n-state information.

Quantum information splitting (QIS) or quantum state sharing is the generalization of classical secret sharing schemes to the quantum scenario. In QIS, a piece of quantum information (in the form of a quantum state) is divided and distributed to a number of receivers. A scheme of splitting two-qubit states was proposed by using six-particle maximally entangled state as the quantum channel. Alice first performs two Bell-basis measurement and announces her measurement outcome and assigns Charlie (Bob) to reconstruct the original unknown state. If the controllers Bob (Charlie) agree to help Charlie (Bob) obtain the original state, they should perform single-particle measurements on their respective qubits. After the sender performs Bell-basis measurements on her particles, and the cooperators operate single-particle measurements on their particles, the state receiver can reconstruct the original state of the sender by applying the appropriate unitary operation.

A theoretical scheme is investigated to detect the noncommutative feature of non-Abelian geometric phases with superconducting Josephson circuits. The results show that, two degenerate dark states are generated in the considered system, and the geometric phases are naturally induced through adjusting external fluxes. By designing two composite evolutions and considering the population difference associated with the same quantum state, the noncommutative feature of the geometric phase can be shown directly. Further analyses on the feasibility and advantages indicate that the present scheme possesses the convenient operations and good quantum coherence. Thus the proposal provides an effective approach to experimentally study the noncommutative property of non-Abelian geometric phase.

A simple scheme is presented for generating 2n-mode photon Greenberger-Horne-Zeilinger (GHZ) states with the interaction of a 2n-level atom with two n-mode cavities. In the proposed protocol, the 2n qubits are encoded in zero- and one-photon Fock states of 2n cavity modes. Because the interaction between the atom and cavity fields is resonant, the coupling strength can be relative strong. This will shorten the corresponding interaction time and thus reduce the effect of decoherence in experiment.

The influence of the depolarization effect on the optical rectification in electric-field-biased GaAs quantum well is studied using relaxation time approximation and a compact density-matrix approach. The results obtained show that the depolarization effect shifts the position of the resonance peak. For three different bias fields, F=3×104 V/cm, 4×104 V/cm, 8×104 V/cm, the peak position is ?ω=108.48 meV, 108.92 meV, 111.99 meV, respectively. The shift of the peak position is 5.96 meV, 5.99 meV and 6.28 meV, respectively, which increases with the bias field.

The Coulomb bound potential effects on the parabolic linear bound potential quantum dot qubit were studied under the condition of electron-LO-phonon strong coupling using the variational method of Pekar type. The numerical results lead us to formulate the derivative relationship of the probability density of electron in superposition state of the ground state and first-excited state with the Coulomb binding parameter, confinement length and electron-LO-phonon coupling strength, respectively.

Based on the model of dual-transmission line, the permittivity ε and permeability μ of artificial material can be adjusted by equivalent construction. When they are simultaneously negative, the artificial material has some fantastic electromagnetic characteristics. Because there is no double-negative materials existing in the nature world, the research on construction and applications of artificial material has widely developed all over the world. The novel unit structure of artificial material with one-dimension and two-dimension are presented, which have low-loss and wide frequency band. At last, the calculation and experiment results have proved the validity and feasibility of the construction.

For the phase-locked loop effect occured in sea surface’s simulation by using double-superposition method, sampling frequency of different wind speeds is selected according to the waves’ narrow-band spectral characteristics. Three-dimensional random sea-surface is simulated by using the method of frequency corresponding to the direction. The simulation results reflect sea-surface actually. Then the reflection, refraction and the total energy transmittance of the uplink laser that propagation through sea-surface are analyzed and simulated by Fresnel formula. The results show that the wind speed changing and incidence angle of uplink laser have a great effect on the energy transmission rate. Finally, the scattering effect of the uplink laser through sea surface is analyzed.

In order to research modulation schemes suitable for indoor wireless optical communication, the modulation structures of five modulation schemes (OOK, PPM, DPPM, DPIM and DH-PIM) are analyzed, the equations of average transmitting power, bandwidth requirement, transmission capacity and packet error rate are derived in detail, and the simulation results are given. In terms of average transmitting power, PPM achieves the smallest followed by DPIM, DPPM and DH-PIM, OOK achieves the biggest. With regard to bandwidth requirement, OOK achieves the smallest followed by DH-PIM, DPPM and DPIM, PPM achieves the biggest. As for transmission capacity, DPPM achieves the biggest followed by DPIM and DH-PIM, OOK and PPM achieves the smallest. Under the condition of the same modulation level, PPM achieves the smallest followed by DPIM, DPPM and DH-PIM, OOK achieves the biggest on the part of packet error rate.

Visible light communication is a novel wireless optical communication technology based on white LED techniques. It has some advantages, such as the high emitting power, no electromagnetic interference and so on. Compared with traditional lens, Fresnel lens can be used in designing an optical reception antenna to reduce cost, thickness of lens and focal length. The designing, simulating and optimizing of Fresnel lens are addressed. The technique requirements and methods for design, simulation and parameters setting are analyzed. Some simulating results and performance analysis are also given. By using optimization, it can reach a good performance. Light collection rate at about 90% can be obtained, which ensures that the F number is less than 1 under the condition where the size of the detector is 1.5 mm×1.5 mm, which can support the antenna design.

In long term evolution (LTE) uplink random access, preamble detection is an important step. Because preamble sequence is long, the traditional receiver algorithms have a larger computation burden. Downsampling was introduced to reduce the computation burden. Several improvements were made to the traditional receiver algorithms. The computation burden of receiver algorithm after improvement decreases greatly in comparison with the algorithm before improvement. Take format 0 for example, the computation burden of algorithm before improvement is 120 times as much as the algorithm after improvement in an operation cycle. Simulation results show that the detection performance of algorithm after and before improvement almost don’t make any difference. The algorithm after improvement shows good performance in various wireless channels.

To reduce computational complexity of 3GPP long term evolution (LTE) uplink diversity reception in multiple antennas system, improve the hardware processing efficiency and achieve relatively good system performance, interference rejection combining (IRC), maximum ratio combining (MRC), simplified interference rejection combining (SIRC) and simplified maximum ratio combining (SMRC) algorithms were compared with simulation analysis of different interference strength in eight antennas system. According to the simulation results, when using SIRC algorithm in eight antennas system, computational complexity can be reduced to 1/(8N) with 1 dB SNR loss, and efficiency can be improved by the method of antennas subarray division. SIRC rather than IRC is used when there is strong correlated interference, SMRC rather than MRC is used when there is weak or negligible interference for diversity reception. As a result, the performance degrades somewhat while computational complexity can be reduced greatly.

An algorithm based on beamforming system models and algorithm criteria is simpler than the traditional eigen-value decomposition method. It also can overcome the problem of the large complexity and system delay in the process of beamforming. According to the TD-LTE protocol, an uplink signal source and model is constructed. And then, the beamforming weighting factor is obtained by constructing the complete beamforming link. In the multipath fading channel, the traditional eigen-value decomposition algorithm based on the QR factorization (a method of orthogonal matrix triangularization) and simple algorithm is simulated. The results indicate that the simple EBB algorithm can reduce the complexity by 1/60 and keep the same or similar precision with the traditional algorithm.