Quantum Teleportation To Many Receivers

Quantum mechanics which studys the microcosmic particle is one of the two important discoverys of physics in twenty century. The direct use of the quantum mechanics is quantum information theory which is the production of the combination of quantum mechanicsthe, information science and the compurer science. Quantum communication is an important branch of quantum information embracing quantum teleportation, quantum dense coding, quantum key distribution and so on. The study on quantum teleportation is very meaningful not only to the development of quantum communication, but also to apprehending the inside of quantum mechanics more deeply.In this dissertation, we have studied several schemes for quantum teleporration in different cases.1. Telportation of muti-particle entaglement. In this paper, we have proposed a scheme of teleportation which teleport a three-particleentanglement to one of the two recievers using two particle entanglement as quantum channel in two and high dimensions. Then generalize it to teleport a three-particle entanglement to one of many recievers. After that, we dicussed the teleportation which teleports a muti-particle entanglement to one of the two recievers in two and high dimensions.And generalize it to teleport it to many recievers. These schemes onely use one entanglement as quantum channel, to compare whith the used schemes, it reduces a lot of resouce of entanglement. At the same time, teleporting a muti-particle entaglement to many recievers is very meaningful to realize quantum computatiom and quantum communication of network.2. Teleportation of three-level atomic state in cavity QED. The scheme used in the paper does not involve the Bell-state measurement. Moreover, during the interaction between atom and cavity, the cavity frequency is large detuned from the atomic transition frequency, thus, the scheme is insensitive to both the cavity decay and the thermal field. All of these are importatnt for realization in experimentation.