| Quantum mechanics is the theoretical basis of modern physics,which reveals the movement law of the objective material world at a deeper level,and constitutes the theoretical basis of modern physics together with relativity.As the basic problem of quantum mechanics,quantum measurement plays a very important role in the research of quantum mechanics.In this paper,based on the influence of quantum measurement on the dynamic evolution of quantum correlation under different conditions,the difference in dynamic behavior between quantum discord caused by projection measurement and super-quantum discord caused by weak measurement is analyzed,and the dynamic behavior of quantum coherence as a special kind of quantum correlation is compared with that of quantum discord in dissipative environment.In this paper,weak measurement is introduced to analyze and discuss the dynamic behavior of quantum system from the perspective of weak measurement,which is helpful for us to explore quantum system with minimal influence on the research system.Our research results in this paper have the following contents(1)This part mainly discusses the dynamic evolution of quantum discord and super quantum discord of two-atoms system in thermal environment,and analyzes the differences in the evolution of quantum discord with time under two measurements,as well as the factors affecting the dynamic evolution.Our results show that the evolution behavior of quantum discord dynamics under strong measurement and weak measurement will change with the change of average photon number in thermal environment,and weak measurement can capture more quantum correlations than strong measurement.(2)This part mainly discusses the influence of weak measurement on the sudden change of decay rate in the evolution of quantum correlation.We discuss the phenomenon that the decay rate of classical correlation,quantum discord and super quantum discord suddenly changes in Bell diagonal state in phase-flip channel.Our research shows that this sudden change only occurs in strong measurement,and there will be no sudden change in the behavior of super quantum discord under weak measurement,which shows that the dynamic behavior of quantum discord is closely related to measurement.(3)This part mainly discusses the similarities and differences between quantum coherence,as the most basic quantum correlation,and the dynamic evolution of quantum discord in dissipative environment.Coherence,as a basic characteristic of quantum system,plays an irreplaceable role in some physical phenomena and quantum tasks,so its research has attracted more and more attention.Our results show that the dissipation effect has the greatest influence on quantum coherence.With the increase of the average photon number,the decay rate of the two correlations accelerates,and the quantum discord and quantum coherence in dissipative environment have similar dynamic characteristics,which provides more help for the research of coherence. |
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