Quantum Correlations Of Two-atom Systems In Classical Noisy Environment Under The Weak Measurement

Quantum correlation is an important resource in quantum information processing. However, quantum correlation is inevitably affected which leads to degradation and even sudden death by the interaction between the system and its environment. Based on memory of the environment, people often use non-Ma rkovian environment with memory and controlling detuning to protect the quantum correlation. In this article, we take the method of using weak measurement reversal to protect the quantum correlation between atoms. However, if a quantum system lies in classical noisy environment,because of properties of classical noisy environment in which cannot store quantun correlations. Hence, how to protect quantum correlations in calssical noisy environment becomes one of central concerns in quantum physics researches. Considering the system can be still in an appropriate state after a weak measurement which can be recovered through the appropriate weak measurement reversal. By using the numerical calculation, we investigate the dyanmiacs of quantum entanglement and quantum discord under the weak measurement, and obtain some meaningful results which show that the weak measurement reversal scheme can protect quantum correlation between atoms. The main content of this paper is as follows:The first chapter mainly introduces the research background and the significance of this article.The second chapter describes the basic theory of open quantum systems and introduces the Markovian and non-Markovian master equation.The third chapter focuses on the theory and measurement method of quantum entanglement and quantum discord, In addition, we also introduce the scheme of weak measurement and weak measurement reversal scheme.The fourth chapter discusses the influence of quantum entanglement and quantum discord of two atoms under weak measurement and weak measurement reversal scheme, the results show that weak measurement and weak measurement reversal scheme can protect the quantum correlation between atoms.The fifth chapter gives the summary and prospect.