Research On Proposal For Quantum Entanglement Of Multi-particle

With the discovery of an apparent separation between the classical and quantum classifications of computational complexity, and of fault- tolerant schemes for quantum computation, quantum information theory has earned a lasting and prominent place at the foundations of computer science. Quantum entanglement is one of the popular topics that people concern in the quantum information. It plays an important role in the field of quantum information and is also the foundation of quantum computation. The thorough research of quantum entanglement will produce the profound influence for basic theories and also the latent actual applications of future of the quantum information.The research fields and development of quantum information is introduced briefly. The key points are put on the basic theories and application prospects of quantum entanglement of the quantum information. We study the problem of quantum system, quantum measure, quantum entanglement, the theory of the manipulation and the generating of quantum states, and so on. A scheme to achieve n-particle entangled states effectively is proposed.Studies are included in this thesis:Following above theory, we propose a different scheme to achieve six-photon entangled states based entirely on the concept of quantum erasure. To begin with, a scheme for making use of a group of four entangled photons to generate six-photon entangled states is presented. Then, with the same technique, the preparation of the six-photon entanglement from five-particle entanglement which is then combined with Bell states is considered. Our experimental methods can be used for the investigations of measurement-based quantum computation and multi-party quantum communication. We find that the success probability is determined by the small coefficients of the entangled states.As a rapidly emerging field, quantum information theory is still in a course of gradual improvement and development. The emergence of some new phenomena deeply indicates the marvelous property of quantum mechanics. With the development of theory and the corresponding experiment, we will find more new property and phenomena in the field.