| Quantum information is a novel and promising research field now. It opens an avenue of information processing capabilities unavailable in classical information. The main task of quantum information is to study the storage, transmission and processing of quantum information by means of basic principles of quantum mechanics and the intrinsic characteristics of quantum states, such as superposition principle of quantum state, quantum no-cloning, and quantum entanglement. Presence of various quantum communication and quantum computation protocols, such as quantum teleportation, quantum dense coding, quantum entanglement swapping and so on, promotes the development of quantum information science greatly. Quantum teleportation, as a basic and important experiment, would be a potential tool in quantum communication and quantum computation and attracts many interests recently. We investigated the generation and detection of quadrature component entanglement by means of continuous-wave laser field experimentally and theoretically, and realized continuous-variable (CV) quantum teleportation experimentally. In addition, by means of semiclassical equation of motion, we discussed the stationary behavior and quantum entanglement characteristics of the reflected pump fields of type II second harmonic generation (SHG) process. Gave the dependence of mean amplitude of fundamental wave on the pump and loss parameters. Calculated the quadrature entanglement spectra of reflected fundamental field in both below and above threshold. We also compared these results with the double resonant case. The creative works are as follows:1. Operating deamplification, entanglement state with anticorrelated amplitude and correlated phase was generated with a double-crystal non-degenerate optical parametrical amplifier (NOPA). The squeezing is about 2dB. Multiplication of quadrature correlation variance is <δ2(XE1+XE2)><δ2(YE1-YE2)> = 0.38<1.
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