| The present dissertation is mainly about experimental generation, manipulation of multi-photon entanglement and its applications in quantum information.We have further developed the multi-photon interference techniques. By making use of polarization entangled photon pairs via parametric down-conversion and linear optics, in this dissertation, we report for the first time the experimental realization of quantum teleportation a composite system, of four-dimension entanglement and the test of two photon GHZ theorem, of synchronization of entangled photon paris, and of fault-tolerant quantum key distribution.Besides for the experimental research, in the end of the thesis we also report a flaw of the quantum key distribution protocol based on blind bases and a feasible solution to it.The techniques developed in this dissertation would dramatically facilitate progresses in many important fields of scientific research, including long distance quantum communication, linear optics quantum computation and test of the foundation of quantum mechanics.
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