Measurement Of Quantum Correlation On Two-mode Continuous State

With the development of quantum mechanics and classical computer is increasingly ma-ture, quantum information has attracted more and more attention. Quantum information theory is a cross subject that it consists of quantum mechanics and information science. It brings people a lot of new perspective and theory, and provides a, new idea and method to break through the limitations of information technology. We use quantum entanglement as a wonderful characteristic to the study of quantum communication and quantum computation. In this paper, we investigated the characteristics of quantum correlation in two mode con-tinuous variable systems, and we put forward two methods to measure quantum correlation of two mode continuous variable systems. We found that the two methods not only can be criteria for quantum correlation, but also can be measurement for quantum correlation. We verify several commonly used two mode continuous variable systems and compare it with Negativity or Concurrence size. We found that they are simpler, more general, easier to calculate, measurable expression in experiment.The content of this paper is divided into four parts to elaborate. The first chapter we introduce the development of quantum mechanics and quantum information science; The second chapter, we introduce the basic knowledge of quantum entanglement; The third chap-ter, through the study of existing entanglement judgment method and two order correlation function, we propose a method to judge and measure correlation of the quantum state:The fourth chapter we find a method of measurement of quantum correlation, and compared with calculation results of the existing entanglement:Finally, we give the conclusion of this paper.