Based on laser Raman spectroscopy technology, the quality identification of fresh tea leaves and growing region discrimination are investigated. Fresh leaves of Zhuye (the original leaves) of six villages in Qimen County, Anhui, China are detected. Results show that there are strong Raman peaks at 748, 831, 1005, 1158, 1328, 1527, 1609 cm-1 in the original leaves from different regions, but the intensities of peaks are different in each group. Principal component analysis (PCA) and linear discriminant analysis (LDA) are used to analyze Raman spectra of the original leaves, and it’s found that the discrimination index of original leaves from different regions is 70.7%.

In order to eliminate the interference of multi-level images and zero-order beam, a system with single-lens structure is proposed, and a single image without crosstalk is obtained. The Fresnel hologram is obtained by using Gerchberg-Saxton (GS) algorithm. The inclined plane wave phase is pre-superimposed on Fresnel hologram to move the image to a central location. The virtual imaging behind spatial light modulator(SLM) is imaged to the front using imaging lens. At the same time, the spatial filter is placed in the rear of imaging lens, and the multi-level images and zero order light are filtered. The size and position of the reconstructed image can be modified conveniently by adjusting the position of lens and SLM, and the optical system length is shortened. The method utilizing the virtual image provides a new way for calculating holographic display based on liquid crystal SLM.

Based on ghost imaging (ghost imageing, GI) and compressed sensing (compressed sensing, CS) theory, the influence of CS reconstruction algorithm on imaging performance of GI is investigated. Discrete wavelet transform is used as image sparse matrix, and the thermal light source intensity distribution with Gauss profile is used as measurement matrix. Quality of compressed GI is analyzed with total variation minimization algorithm based on augmented Lagrangian and alternating direction method (TVAL3), orthogonal matching pursuit (OMP), compressive sampling matching pursuit (CoSaMP) algorithm, gradient projection algorithm (GPSR~~ basic). Mean square error, peak signal to noise ratio, matching degree and structural similarity index are taken as the objective evaluation criteria for image quality, and the reconstruction results of GI using four kinds of reconstruction algorithms are compared. Results show that when the compression ratio is 0.5, the reduction degree of TVAL3 algorithm is the highest, and the distortion of CoSaMP algorithm is the most serious. The reconstruction performance of GPSR~~Basic algorithm is better than that of OMP algorithm.

Aiming at the shortage that tensor product wavelet only emphasizes the horizontal and vertical directions, the properties and characteristics of two-dimensional wavelet are investigated. A fast algorithm for two-dimensional four-channel non-separable wavelet and its mathematical proof are presented. The computation of the algorithm is analyzed, and the construction method of filter banks is discussed. Theoretical deduction and analysis show that the computation speed of this algorithm is faster than that of the non-sampling two-dimensional non-separable wavelet transform and two-dimensional fast Fourier transform. The decomposition experiment of non-separable wavelet is performed by constructing filter banks, and it’s compared with the tensor product wavelet. Results show that the non-separable wavelet transform can extract more comprehensive information of each direction when the image is filtered.

A visible and infrared image fusion algorithm based on saliency features is proposed to improve fusion quality of objects. The saliency detector is introduced to process the infrared image for generating the saliency map. The salient interest points are extracted in the image by further analyzing the IR image and detecting interest points. The saliency areas are identified by calculating the convex hull of salient interest points, and the target positioning becomes more accuracy by using salient interest points to optimize the initial salient mapping. The background area of visible light image is obtained according to the region mapping, and the final fusion image is obtained by using different fusion rules to fuse the target and background regions. Results show that this algorithm has advantages with clearer detail texture of fusion image in standard deviation, joint entropy and edge information factor indexes compared with the common visible image fusion technique.

A new family of periodic breather wave solutions and kink breather wave solutions of initial perturbation for the (1+1)-dimensional Benjamin-Ono(BO) equation are obtained by using the homoclinic test method with bilinear transformation of initial perturbation. Meanwhile, rational wave solutions of initial perturbation and bifurcation point of dynamics are also gained by applying quadratic function ansatz method. Some local perturbation structure of dynamics are shown directly. Results show that the dynamical behavior of the equation is sensitive to initial values.

The method combing the function transformation and second order homogeneous linear ordinary differential equation with constant coefficients is proposed. With the help of symbolic calculation system Mathematica, the new soliton-like solutions of (3+1) dimensional Burgers equation with variable coefficients are constructed, which consists of the exponential function, trigonometric function and rational function.

The effects of pump intensity, pump wavelength and pulse width on state populations of three-level ladder K2 molecule driven by intense femtosecond pump-probe pulses are investigated and firstly quantified by employing the time-dependent wave packet method. The pump intensity, pump wavelength and pulse width affect Rabi oscillation, which results in the periodical change of the populations of electronic states. The effect of quantization field parameters on population of the excited state shows that the change frequency varies with increasing of pump intensity and pulse width. Results provide an important reference for realizing the molecule optical control in experiment and further study of K2 molecule dynamic properties.

In order to obtain a 1080 nm miniaturization, high power, continuous fiber laser, a 915 nm semiconductor laser diode (LD) is used as the pump source, and the resonant cavity is composed of two fiber gratings. Combining with beam combiner, stripping mold, collimator and other optical devices, an all fiber laser system is constructed using 12 m Yb-doped double cladding fiber as the gain medium. When the pump power is up to 118 W, a continuous and stable laser output with a power of 80 W and an optical conversion efficiency of 68% is obtained experimentally. The laser system is assembled into a self-designed compact cuboid aluminum housing. The total weight of fiber laser is less than 1.8 kg, and the volume is 200 mm×160 mm×40 mm. It can work stably in environment ranging from -40 °C to 50 °C.

The logical relationship between Bell state and single quantum bit logic gate is used in quantum multi-proxy signature protocol. Multiple-proxy signature operation is realized simply and efficiently. The protocol is not restricted by the number and sequence of proxy signers, and the operation is simple. It can be realized completely in the existing technical conditions. The correctness and security analysis of the protocol shows that it is a secure and achievable quantum multi-proxy signature protocol.

A quantum wireless communication network model is established. The information from source is obtained through the establishment of quantum channel at both ends of the relay points, and the transmission of multi-level quantum wireless network information is realized. Based on the classical certification, quantum teleportation and entanglement swapping technology are adopted to carry quantum state with information, and the identity authentication of wireless communication network is realized. Combined with Grover quantum search algorithm, the paths with maximum routing metrics in a limited hop counts are searched as the target solution path. The disconnection of quantum channel due to consumption of entangled quantum pairs is avoided. The success rate is guaranteed. The network computation complexity of quantum communication network is reduced, and route search is in fast convergence.

The stock transaction database contains a lot of sensitive information in stock exchange. It is very important to guarantee privacy of the account and database when the user queries the database. The asymmetric quantum key distribution(QKD) and its excellent properties are analyzed. An oblivious set-element mapping decision protocol is proposed based on asymmetric QKD. The protocol ensures the privacy of both the user and database when querying the database. Security analysis results show that the protocol can effectively resist the quantum memory attack, fake quantum state attack and entangle-and-measure attack. It has a high channel loss tolerance.

A quantum scale-free network is built up by establishing pairwise entanglement state among nodes. The entanglement percolation threshold values change is compared by random attacking on nodes in network by the way of localization entanglement swapping, and making the nodes targeted failure with the same probability. Results show that the threshold values decrease significantly under random attack and increase significantly under targeted failure, which reflects robustness and fragility of the quantum scale-free network. The scale-free quantum network with entanglement distillation is still robust and fragile under random attack and targeted failure, but which is relatively weaker than that without distillation. It indicates that the real network has a better robustness.

In order to improve the communication efficiency and security of quantum secure direct communication proposed by Chang Yan etal, a quantum secure direct communication scheme based on d-dimensional Bell entangled state is designed. Before communication, the unitary transformation is carried out on d-dimensional Bell-state particles by the sender Alice to encode the secret information. Then the transformed d-dimensional Bell-state two-order sequence is transmitted to the receiver Bob. Combining with some classical information, the transmission of secret message is achieved by using the results of respective POVM measurement and the entanglement characteristics of Bell state particles. By using entropy theory and probability theory, the protocol security is analyzed. Results show that the proposed scheme is secure, and it has a higher transmission efficiency and a rise of 11% in the eavesdropping detection rate than that of the scheme proposed by Chang Yan et al.

The entanglement dynamics behavior of a class of hybrid entangled state in two different quantum channels and entanglement sudden death phenomenon in the process of decoherence are investigated. The entanglement of phase damping channel and depolarization channel is calculated, and the entanglement change with time is analyzed. Results show that the entanglement sudden death phenomenon will not appear in the phase damping channel. The hybrid entangled state will undergo entanglement sudden death in the depolarization channel, and the entanglement will decay to zero within a certain time.

The Wigner-Yanase skew information of trapped ions in a standing-wave field is investigated and the revival period is also obtained. It’s found that the period is the same as revival time of ion population inversion. The analytical solution and numerical simulation are analyzed. The revival period of Wigner-Yanase skew information is found to decrease with the increasing of Lamb-Dicke parameter, and increase with the increasing of ion mean vibration phonon number. The revival time will be longer when the ion mass center is moved from wave node to anti-node. It is theoretically proved that the initial state information of the ions is always 1/2 when vibration state of trapped ions is in coherent state. The characteristics of quantum entanglement between the ion and standing wave laser field are analyzed.

Under the condition of turbulent freezing, the theory model of inversing the vertical distribution of transverse wind speed is proposed by using space-time cross correlation function of two position detection jitter signals. Two parameters of this model are turbulence profile and derivation of cross correlation function at the delay time of zero. Supposing that transverse wind speed is accord with Gauss model, numerical simulation is carried out with genetic algorithm. Through the inversion calculation of two typical turbulence models, it’s found that the inversion wind profiles are coincide with the theoretical wind profiles, and the relative error is not more than 3.3% and 1.6%, respectively. The characteristic height of the turbulent profile is changed and inversion calculation is carried out. Results show that when there is a large error in the turbulence intensity, the model can still be applied to inverse vertical distribution of transverse wind speed in the lower layer.

By comparing the catalytic activity of two morphology FeS2 particles and its performance in dye-sensitized solar cells(DSSCs), FeS2 particles with higher performance are selected. Cubic and spherical high purity FeS2 are synthesized by hydrothermal method and hot-injection method. Counter electrodes (CEs) are prepared with FeS2 and assembled on DSSCs. By measuring the photoelectric conversion efficiency of battery and catalytic characteristics of CEs, it is found that the spherical particles show higher catalytic activity, and the battery based on spherical FeS2 CEs presents a higher photoelectric conversion efficiency. Under simulated solar light irradiation with intensity of 100 mW/cm2 (AM 1.5), the DSSCs based on the cubic and spherical high purity FeS2 CEs achieve photoelectric conversion efficiency of 4.55% and 5.69%, respectively.

The Al-doped Mg2Si thin films on Si substrates are fabricated by magnetron sputtering method. Influences of doping levels on the compositions, surface topographies, roughness and optical band gap values of Mg2Si thin films are investigated with X-ray diffraction (XRD), scanning electron microscope(SEM), atomic force microscope(AFM) and spectrophotometer. XRD results show that the diffraction peaks of Mg2Si become stronger firstly, and then become weaker with increasing of Al doping amount. SEM and AFM results show that the crystallinity increases first and then decreases. Grain size decreases, and the roughness increases first and then decreases with increasing of Al doping level. The indirect transition band gap of the doped films ranges from 0.423 eV to 0.495 eV. The direct transition band gap ranges from 0.72 eV to 0.748 eV. The indirect and direct transition band gap are 0.53 eV and 0.833 eV before doping, respectively.