The Thermal Entanglement Effects Of Heisenberg XY Model Under Non-uniform Magnetic Field

Because quantum information and quantum computation may bring great advance to information technology and the future society, it attracts great attention in recent years. And now, it has developed into a hot research field, which combine physics and information science. Quantum information is the combination of information science and quantum mechanics, exploit applied new world of quantum mechanics, provide new method and principle for the information technology of 21 century. The screwball characteristic of quantum world will bring into play important effect in information subject, enable the information function of quantum information system break through the limit of classical information system. Now human society is at the blast tide of information, then the naissance of quantum information outline attractive blue print for the future information science and technology without question. In this paper, we mostly study the 1,2 quibt's and 1,3 quibt's thermal entanglement of three quibts Heisenberg XY model under non-uniform magnetic field. In the first chapter introduced the currently general situation of quantum information. We recommend basic knowledge which we need to study this problem and some important point of quantum information from why we study quantum information by and by. In the second chapter we introduced how to realize logic gate and others in quantum information, and illustrate practice meaning of our study. Finally we simply introduced density matrix and reduction density matrix, which put matting for the next chapter's theory depiction.