Study On Dynamics Of Quantum Coherence

Quantum coherence stems from quantum state superposition principle,which plays an important role in quantum biology,nanothermodynamics,quantum optics,quantum information processing and so on.The research on quantum coherence not only enriches the theory of quantum mechanics and deepens the understanding of the nature of quantum phenomena,but also has broad application prospects.However,the actual quantum systems should be considered as open quantum systems,since it inevitably couples with the environment which causes the decoherence.It affects the application in quantum resource.Therefore,studying the dynamics of quantum coherence in open system behavior,the characteristics of the noise environment and the effect of noise to the applications of quantum coherence has far-reaching significance.In the past three years,I mainly investigated the dynamic behaviors of quantum coherence.Specifically,we have examined the quantum coherent framework,coherence measure and collected the literatures of the typical noise channels.On the basis of them,we have made the following two aspects of innovative achievements:1.The effect of Unruh effect for freezing coherence in decoherence.We observed the basic knowledge of quantum coherence,open quantum systems,inertial systems,etc.Moreover,we explored the interaction between quantum systems and environment and decoherence within noninertial system.It has been found that Unruh effect does not affect the known initial conditions which guarantee freezing of coherence,while it decreases the amount of preserved coherence.2.Effect of local noises on achieving nonlocal advantage of quantum coherence.We investigated the related knowledge of the quantum steering,quantum nonlocality and the nonlocality advantage of quantum coherence.On the basis of them,we focused on the dynamic behavior of the quantum steering,quantum nonlocality and the nonlocality advantage of quantum coherence.It shows that:(1)For some nonlocalized entangled pure state,it cannot achieve nonlocality advantage of quantum coherence;(2)the effect of local noise on nonlocality advantage of quantum coherence is very serious,even appears the phenomenon of "sudden death".Compared with steering and Bell non-locality,the effect of local noise on achieving nonlocal advantage of quantum coherence is dominated.It is required to seek certain measures to improve its environmental resistance.