Quantum image encryption is a typical problem in quantum image processing. At present, most documents are based on geometric transformations, which is used to encrypt images of 2n×2n size. This encryption method cannot satisfy the image of any size and is of obvious cyclicity. When the number of transformations reaches a certain number, the image will be restored. Based on scrambling of pixels, a new encryption method is proposed. An improved NEQR model is used to represent quantum color images, then the pixel are scrambled. Random rotation to each of the pixels is carried out by a quantum revolving gate. Then, the image is encrypted and not contained any original information.

A new optical encryption(OE) scheme based on multiple wavelength light source for computational ghost imaging(CGI) is proposed. In the scheme, using red-green-blue three color light to generate multiple random speckles, the phase mask matrix of speckles sequence is modulated into a random Toeplitz matrix. The corresponding wavelengths of speckles are random three color light wavelengths. The phase mask and wavelength are simultaneously used as two keys for optical encryption. After all speckles arrive at an object at the same axial distance, the compressed sensing technology is used to restore the object image. Numerical simulation shows that the scheme can completely restore the object image under all known conditions of the dual key, and the key stealing rate is less than 60%, which can not get the image information of the object. To get the same quality image, the number of measurement and transmission key is only 1/3 based on the double key optical encryption scheme of ghost imaging.

For traditional correlated imaging system, the imaging scene is completely sampled by the illumination speckles. According to the compression sensing theory, most of the object information has sparse characteristics under some transformations, and it can be recovered exactly from a relatively small number of samples. A correlated imaging system with sparse speckles is proposed. Imaging scene is illuminated by sparse speckles, and the information of compressed scene is acquired by compressive imaging system. Finally, the complete scene information is accurately restored using compression sensing algorithm. The experimental results show that sparse speckles can effectively reduce the amount of data to improve the imaging efficiency and the quality of the imaging system.

Liquid crystal variable retarders(LCVR), a kind of wave plate using liquid crystal birefringence effect, can modulate the incident light phase by changing the electric field. It needs to be calibrated accurately advancely because of its phase delay related to the voltage, wavelength, temperature and other factors. The calibration method of LCVR based on Stokes vector measurement was proposed, and the functional relationship between the system stokes vector and the LCVR phase delay was established. The Stokes vector of light was measured by polarization measurement instrument, then the phase delay of LCVR was calculated. The proposed Stokes vector method was compared with the two traditional light intensity calibration methods, and the correctness of the new method was verified. Stokes vector method is more simple and convenient, the system no longer needs analyzer, and avoided the error from the transmission axis calibration and light intensity measurement. Finally, the influences of voltage, angle of polarization of incident light, incident wavelength and temperature on the phase delay of LCVR were analysed.

To obtain the hyperfine transition spectrum of microwave 199Hg+ ion frequency standard there must be trapped 199Hg+ ions. 199Hg+ ion confinement is closely related to the stability of this frequency standard. The influence of radial confinement potential on the trapped 199Hg+ ion number in quadrupole linear ion trap was studied through experiments according to the stability condition of Mathieu equation. It is found that the influence is reflected in three aspects by spectrum scanning: fluorescence intensity, spectrum width and center frequency. As the radial confinement potential increases, the intensity of fluorescence becomes larger, the spectrum width becomes narrower, and the center frequency becomes smaller. Then, a miniaturized radio frequency (RF) source was designed based on the experiment. This RF source can provide the required radial confinement potential to guarantee the stability of the trapped 199Hg+ ion. The Amplitude stability of the RF source is 0.51 V expressed by standard deviation（SD）. The RF source volume of is only 0.1 L and the power consumption is about 3.5 W, which can meet the requirement of the frequency standards miniaturization.

The secure transmission of power information data, especially the international business data, determines the safety of the entire grid network. The unconditional security of quantum communication technology can greatly improve the security of system data transmission and provide the detectability of eavesdropping. A scheme is proposed for the international business data transmission in the international grid network based on measurement-device-independent quantum key distribution(MDI-QKD) protocol, where a plug and play structure is adopted due to the characteristics of the international business data transmisssion. The scheme includes the control and measure center, extranet international business zone and overseas transmission front area. The control and measure center is in charge of the generation of light pulse and Bell measurements. The extranet international business zone and overseas transmission front area are connected with virtual private network (VPN) via key management ports to encryt data. The feasibility of the proposed scheme is verified by theoretical analysis.

To resolve the problem of circuit synthesis and quantum cost optimization in linear nearest neighboring of quantum circuits, an algorithm considering look-ahead influencing factors for synthesizing and optimizing the linear nearest neighbor quantum circuit is proposed. For any given non-nearest neighbor quantum circuit, the algorithm can separately measure the impact of operating the current quantum gate with different methods on the nearest neighbor cost of the subsequent quantum gate and reduce the number of SWAP gates required for the near-neighboring process of adjacent quantum gates. Thus, the requirements of constructing and optimizing linear nearest neighbor quantum circuits can be achieved. Experiments are conducted with the typical Benchmark examples, and the results of the logic synthesis algorithms for linear nearest neighbor circuit are compared among the representative and comparable research findings. Results show that the proposed optimization algorithm makes a great improvement in adding the incremental SWAP gates. Among the 22 Benchmark examples, 18(81.82%) are positively optimized, with an average positive optimization rate of 18.32%, and an average optimization rate of 11.75%.

One of the key tasks in quantum information is to realize quantum information transfer with high fidelity. Based on the theory of perfect transfer of single bit quantum information in spin chain, the influences for quantum information transfer of two kinds of magnetic fields in N = 5 spin chain are studied respectively by the method that Hamiltonian of the system is diagonalized. It is shown that the uniform poor magnetic field does not affect the perfect transfer of quantum information, and for the poor magnetic field with antisymmetry about the chain center and mean variation in space, the condition to realize perfect transfer of quantum information is determined by the magnetic field strength difference. The stronger the magnetic field is, the shorter the time to achieve perfect transmission; the weaker the magnetic field is, the longer it takes.

The nonclassical properties of the nonlocal photon-added two-mode coherent state were investigated theoretically. The results show the excitation number has significant effect on cross correlation effect and sub-Poisson distribution effect. Only if the excitation number s6, the cross correlation effect can be observed. With increasing of the excitation number, the cross correlation effect will strengthen but the cross anticorrelation effect will weaken. On the other hand, the sub-Poisson distribution effect of the light field is decreased with the increase of the excitation number. Finally, a scheme for the preparation of the nonlocal photon-added two-mode coherent state based on trapped ions is proposed.

The transmission characteristics of linearly polarized light in one-dimensional magneto-optical photonic crystals are numerically analyzed by using the transmission matrix method. The 4×4 transmission matrix was derived, and then the transmission spectrum and Faraday rotation angle of linearly polarized light in one-dimensional magneto-optic photonic crystal are calculated numerically. The results show that the transmission spectra of left-handed and right-handed circularly polarized light propagating in one-dimensional magneto-optic photonic crystals do not coincide with each other due to the magneto-optic effect of magneto-optic materials when an external magnetic field is applied. Finally, the amplitudes and phases of the x-component and y-component of the electric field intensity of the transmitted light are calculated, the expression of the transmitted light is obtained, and the Faraday rotation angle is calculated.

Non-classical polarization properties of the two-mode partially coherent Gauss-Shell model beam propagating through non-Kolmogorov turbulence are analysed. The analytic equation for the polarization degree of the quantum state of the two-mode light field is obtained. Results show that the polarization fluctuations of the quantum state of the two-mode light field are dependent on the turbulence and the detection photon numbers. The polarization degree of the quantum state of the two-mode field gradually decrease. Furthermore, the bigger difference is on the two orthogonal polarization modes detected photon numbers, the better the polarization properties of the two-mode light field are maintained, which is contrary to the two-mode coherent state light field.

Inverse synchronization of hyperchaotic systems with heterogeneous structure is investigated. The parameters of feedback gain matrix are optimized by using quantum genetic algorithm (QGA), which overcomes the difficulty of parameter tuning in feedback gain. Numerical simulation results show that the QGA combining with the feedback inverse synchronization method can make the hyperchaotic Chen system and Lorenz system of the heterogeneous structure achieve inverse synchronization quickly in a short time, which shows the superiority of the algorithm, and verifies the feasibility and effectiveness of QGA in solving the inverse synchronization problem of heterogeneous structure.

A self-similar transformation method is utilized to reduce the generalized nonlinear Schrdinger equation (NLSE) with variable coefficients to the standard NLSE in space-time modulation photonic crystal lattice, whose soliton solutions are then transformed back into the solutions of the original equation. Special kinds of explicit solutions, such as periodically breathing bright and dark solitons, are discussed in detail.

In order to improve spectral stability and quantitative inversion accuracy of heavy metal in soil by laser induced breakdown spectroscopy (LIBS), hemispherical space constraint structure has been designed, the relative standard deviation (RSD) and relative error of prediction (REP) of LIBS of heavy metals are studied. Multiple average and internal standard method are used to process spectral data, the RSD of spectrum has been reduced 1.59% and 3.65% respectively by increasing the number of pulses and internal standard method, and the spectral stability has been improved. The REP of sample concentration is comparatively analyzed under univariate and patial least squares (PLS) method, REP of univariate method of four characteristic spectral lines CrI: 357.869 nm, CrI: 359.349 nm, CrI: 425.435 nm and CrI: 427.480 nm are 9.42%、8.43%、 6.16% and 7.79% respectively, the REP of PLS under four variable combination are 3.70%、4.10% 、4.83% and 4.67% respectively. The REP of sample is reduced 5.72% by PLS method, and the accuracy of quantitative inversion is improved. The above results provide data and method support for improving analytical ability of LIBS of heavy metals in soil.

A typical air pollution process in Beijing, China was analyzed by ground-based lidar network, vehicle-based lidar, meteorological data, PM2.5 mass concentration and backward trajectory results of Beijing and its surrounding areas, from March 9 to march 14, 2018. The results indicated obviously that the air pollution process was a typical regional pollution accumulation and transmission process, and it had a long duration and wide range of influence. During the air pollution process, there is an obvious characteristic of aerosol mass transmission along the southwest transport pathway of Beijing. The polluted air mass transported from the south to Beijing along the southwest pathway, causing the rapidly rise of PM2.5 mass concentration in Beijing. The observation based on lidar network and vehicle-based lidar, can effectively support the researches of pollutants transmission in Beijing-Tianjin-Hebei and its surrounding areas.

To study the impact of emissions at an airport on local air quality, a measurement campaign at the Beijing Capital International Airport was performed from 10 to 16 December 2014. Measurements of CO, ethene (C2H4) and hexane (C6H14) were conducted with solar occulation flux-Fourier transform infrared spectrometer (SOF-FTIR) system to determine real in-use emission indices of aircraft. The characteristic concentration values of three target gas were analyzed. The results shows that there was a high correlation between them and the average column concentration of ethylene, hexane and Carbon monoxide in the airport are 13.18, 97.82, 3065.56 ppm, separately. By combining the measurement data released by International Civil Aviation Organization (ICAO), it can be concluded that the emissions of ethylene and hexane at the international airport have reached the levels of total hydrocarbon emissions 3.32% and 66.96%, respectively. The results show that the SOF-FTIR technology has good consistency with ICAO data and provides technical support for the assessment of aircraft emissions.

A radiometric calibration method is introduced by using the Moon as on-orbit calibration reference for the visible channel of geostationary remote sensing radiometer. Lunar images in FY-2E’s operational frames were collected and selected. Lunar disk-integrated irradiances were calculated for data processing. The main procedures of data processing include lunar image over-sampling correction, distance correction, and lunar phase correction. The long-term response attenuation of the visible channel of FY-2E’s radiometer was evaluated by the time trend of the sequence. The result shows that the annual attenuation rate of the visible channel of FY-2E’s radiometer is about 2.17%, which is consistent with the results of other calibration methods. The long-term response attenuation of geostationary remote sensing radiometer visible channel is well assessed by using the lunar calibration technique, providing reference for the systematic correction of the radiometric calibration of the radiometer.

The electronic structure and optical properties of the Al-doped TiO2 crystalline material is investigated by density functional theory calculation method. The results show that the intrinsic TiO2 has direct energy gap of 2.438 eV, the Al-doped TiO2 has decreased direct energy gap of 2.329 eV. The intrinsic TiO2 and the Al-doped TiO2 both have five sub-bands, but the regions that the sub-band location has changed for the Al-doped TiO2. The Al has introduced many new bands within the valance bands; the density of states at Fermi level has been also decreased. The Al-doping is n type doping for the TiO2 material. The s and p electrons contribute to the mobility of carriers within the bands. The dielectric absorption peak of Al-doped TiO2 locates at 320 nm, the absorption region is widened by Al-doping and the absorption region has moved to long wave light area. Both systems have the similar refractive index curves under 1000 nm. The refractive index of Al-doped TiO2 is decreased under 500 nm, and it is increased above 500 nm comparing with the intrinsic TiO2.

A kind of photonic crystal fiber with symmetrical elliptical air holes is proposed, the properties including electric field distribution, birefringence, dispersion, non-linearity and confinement loss of fundamental mode of this fiber are investigated using full vector finite element method. The results shows that the most of fundamental mode energy is limited to the fiber core. The birefringence can reach 3.327×10-2, and the dispersion value is almost zero, at the same time, the nonlinear coefficient is as high as 46.36W-1·km-1, as well as, the magnitude of confinement loss can be reduced to a value of 4.907×10-4 dB/km and 6.819×10-7 dB/km in x-polarization and y-polarization of fundamental mode respectively, when λ=1550 nm, Λ=3.0 μm. There are two zero-point dispersion wavelengths in the visible band and near infrared band of this fiber, and the position of zero-dispersion point wavelengths are move to the long-wave direction with the hole pitch Λ increases, in a range of wavelengths from 0.60 ～1.80μm. Based on the highly birefringence, highly nonlinear, two zero-dispersion and low confinement loss, the photonic crystal fiber could be widely used in optical fiber sensing, optical fiber communication, dispersion control and nonlinear optics.