Quantum Discord Under The Different Envrionment For Two Qubits Heisenberg XYZ Chain

Quantum information is a new subject of quantum mechanics andinformation science, which is based on the basic principles ofquantum mechanics, through various coherent characteristics ofquantum systems transform the informations. In the past20years,people had made great achievements both in the theory and theexperiment.Correlation is a kind of common phenomenon, it can be existed inany two physical system. In the classic field, we can use Shannoninformation theory to process the correlation very well. In thequantum field, quantum information including the relations betweenthe classical and quantum correlation, quantum entanglement is aform of quantum correlation. In the process of the development ofquantum information, we used quantum entanglement to measurequantum correlation. Quantum correlation can be used to achieve the task that some classic methods can not achieve, so there are a lot ofscientists are working on this research.Quantum entanglement as a measure of quantum correlationbecame very effective since the late twentieth century. It hasattracted a great attention of many scientists and has become a newactively explore area. In a long time, people equate quantumentanglement as quantum correlation. A recent study found thatquantum entanglement does not represent all the classical quantumcorrelation. Studies have shown that in some separate states whenthe quantum entanglement is zero, some quantum correlations canstill be observed. So scientists do put forward many differentmeasures to describe this quantum correlation, such as quantumdiscord, measurement-induced disturbance, relative entropy ofdiscord and the geometric measure of quantum discord. Among thesestudies, quantum discord (QD) is widely used to measure thequantumness of correlation contained in a bipartite quantum state.This paper firstly introduces the basic contents of quantuminformation, including the generation of quantum information science,quantum information science basic research content and researchstatus domestic and overseas. Secondly expounds the basicprinciples of quantum entanglement, and its measure then weintroduces quantum discord, as well as the measurement-induced disturbance. In the third chapter analyzes steady quantum discordbehavior for two qubits Heisenberg XYZ chain with intrinsicdecoherence. We found that properly tuning the external and selfparameters can not only improve the quantum correlation and steadyquantum correlation but also weaken the effects of decoherence suchas increasing anisotropic parameter, decreasing B or b. In the fourthchapter, we further discussed the quantum discord behavior for twoqubits Heisenberg XYZ chain with inhomogeneous magnetic field. Theresults show that by controlling the anisotropy parameters and Zdirection spin coupling intensity values, we can increase the value ofQD. Finally, in chapter five we research content of this paper and theexisting shortcomings of a general summary.