Generation And Application Of Multipartite Entangled State

We live in a word surrounded by information. Information science plays an important role in our lives and is necessary for the human development. But the existing information system has been developed very well and is close to utmost in the filed of orthodox information science, such as electronic computer, communication network, information detection and so on. In this case, the science of quantum information appears in order to satisfy the requirement of modern society. Quantum information, which is developed after 1980s, is a field combination of quantum mechanics and information science. It is an important new technology in later Moore era, which can break through the physical limitation of existing information system. The science of quantum information processing possesses the potential of epochmaking change, so it attracts much attention, not only in science field, but also in information domain and military field. Therefore it becomes one of most commercioganic field in the world and develops fast and fast.Entanglement is a striking and unimaginable phenomenon because of its nonlocality allowed in quantum mechanics. In the field of quantum information, entanglement, which is a very useful information resource, plays a key role in quantum teleportation, quantum dense coding, quantum cryptography and quantum computation (speed up computation in quantum algorithms, correct-error and tolerant-error). Bipartite entangled states have been known very well by scientists and some of generation schemes have been proposed. However, multipartite entangled states are still under research. In our paper, we mainly discuss the generation of multipartite entangled states and the implementations of entangled states in quantum computation, the result is following1. The generation schemes of multipartite entangled states.(i) We propose a scheme for generating multipartite cluster states via cavity QED. We take ideal case and practical case (with cavity decay and atomic spontaneous emission) into consideration, respectively. Our scheme only...