Non-Markovian Dynamics Evolution And Quantum Communication Properties Of Quantum Correlations In Heisenberg Spin Chain Systems With KSEA Interactions

Quantum communication technology is the research focus of Quantum Information Science in recent years.Among them,quantum correlation,as an important resource in quantum information processing,has attracted the attention and research of a large number of scientific researchers.The Heisenberg spin chain system in the solid-state quantum spin system is an important physical system in the realization of quantum information processing system.Due to the interaction of energy and information between the open system and the environment,the decoherence process will occur in the interaction process of energy and information,which will lead to the attenuation of the existing correlation in the system.As an important resource in the quantum system,the attenuation of quantum correlation is a loss for the quantum system.Therefore,how to delay the interference of quantum environment is an important work.The non Markov quantum state diffusion method can be used to study the interaction between quantum correlation and environment in the presence of external field.Therefore,this paper studies the quantum correlation characteristics of Heisenberg spin model with KaplanShekhtman-Entin-Wohlman-Aharony interaction by using the non Markov quantum state diffusion method,and then realizes quantum dense coding and quantum teleportation through quantum correlation.The evolution characteristics of quantum correlation,quantum dense coding and quantum teleportation are analyzed by adjusting the controllable parameters such as Kaplan-shekhtman-Entin-Wohlman-Aharony interaction,magnetic field intensity and temperature.It provides a theoretical basis for studying the evolution characteristics of quantum correlation,quantum dense coding and quantum teleportation of solid-state quantum spin systems.The thesis is divided into six chapters.The first chapter introduces the basic content such as the development history of quantum informatics combining informatics and quantum mechanics,and the basis for selecting topics.Chapter 2 presents the distinction between open quantum systems,Markov and non-Markov processes,and theoretical knowledge about the interactions that exist in Heisenberg systems.In Chapter 3,the Heisenberg XYZ spin chain model and the non Markov quantum state diffusion method at zero temperature and thermal equilibrium are introduced.In Chapter 4,the quantum correlation evolution of Heisenberg XYZ spin chain with Kaplan-Shekhtman-Entin-Wohlman-Aharony interaction is studied.The results show that the strong Kaplan-Shekhtman-Entin-Wohlman-Aharony interaction can make the system in a strong correlation state.At this time,it is necessary to avoid the system in a non-uniform magnetic field environment.When the Kaplan-Shekhtman-Entin-WohlmanAharony interaction of the system is small,the quantum correlation of the system can be improved by adding a uniform magnetic field.Temperature has a negative effect on the KaplanShekhtman-Entin-Wohlman-Aharony interaction.In Chapter 5,the evolution characteristics of quantum dense coding channel capacity using entanglement in Heisenberg XYZ spin chain with Kaplan-Shekhtman-Entin-Wohlman-Aharony interaction as quantum channel are studied.The results show that the strong Kaplan-Shekhtman-Entin-Wohlman-Aharony interaction can make the system in an effective dense coding process.At this time,it is necessary to avoid the system in a non-uniform magnetic field environment.When the Kaplan shekh tman entin wohlman aharony interaction of the system is small,the effective dense coding process of the system can be enhanced by adding a uniform magnetic field.Temperature has a negative effect on the role of Kaplan-Shekhtman-Entin-Wohlman-Aharony interaction in dense coding.In Chapter 6,the evolution characteristics of the average fidelity of quantum teleportation using entanglement in Heisenberg XYZ spin chain with Kaplan-Shekhtman-Entin-Wohlman-Aharony interaction as quantum channel are studied.The results show that the strong Kaplan-Shekhtman-EntinWohlman-Aharony interaction can keep the transmission fidelity at the system in a large ideal state.At this time,it is necessary to avoid the system in a non-uniform magnetic field environment.When the Kaplan-Shekhtman-Entin-Wohlman-Aharony interaction of the system is small,the average fidelity of the system in the process of teleportation can be improved by adding a uniform magnetic field.Temperature has a negative effect on the role of Kaplan-Shekhtman-Entin-Wohlman-Aharony interaction in the process of teleportation.