开放量子系统中的ZENO效应

发布时间：2018-04-17 21:47

本文选题：量子Zeno效应 + 量子关联　；参考：《天津工业大学》2017年硕士论文

【摘要】：随着量子信息的发展,量子纠缠和量子Zeno效应的研究引起人们广泛的关注。本文研究了原子-场系统中的量子关联和量子Zeno效应。本文在第一章中简单介绍了原子-场系统量子关联和量子Zeno效应的产生背景与发展前景。在第二章中详细介绍了量子测量、量子Zeno效应、量子熵、量子纠缠与量子discord等方面研究内容与方法。在第三章针对原子与场作用下的系统,在Jaynes-Cummings模型下,频繁测量与原子-场间纠缠度的关系。随着测量时间间隔的减小,初态存活几率不衰减,出现量子Zeno效应。在第四章中研究了两个原子依次通过一个腔中的动力学纠缠特性。分别考虑场处于Fock态和热态下两原子纠缠随时间演化趋势,以及纠缠死亡现象。在第五章中研究了在压缩真空库中,原子与场相互作用下的二比特系统量子discord与量子纠缠的动力学行为。重点分析了原子的初始态系数和压缩真空库的压缩系数对量子纠缠和量子discord的影响。最后研究了在原子的初始态系数和压缩真空库的压缩系数的值相同的情况下,量子discord比量子纠缠存在的时间更长些。
[Abstract]:With the development of quantum information, the study of quantum entanglement and quantum Zeno effect has attracted much attention.Quantum correlation and quantum Zeno effect in atom-field system are studied in this paper.In the first chapter, the background and prospect of quantum correlation and quantum Zeno effect in atom-field system are briefly introduced.In the second chapter, quantum measurement, quantum Zeno effect, quantum entropy, quantum entanglement and quantum discord are introduced in detail.In the third chapter, the relationship between frequent measurements and the degree of entanglement between atoms and fields in the Jaynes-Cummings model for the system under atomic and field action is discussed.With the decrease of the measurement time interval, the survival probability of the initial state does not decrease and the quantum Zeno effect occurs.In chapter 4, the dynamical entanglement of two atoms passing through a cavity is studied.The evolution trend of entanglement with time and the phenomenon of entanglement death in Fock state and hot state are considered respectively.In chapter 5, the dynamical behavior of quantum discord and quantum entanglement of two-bit system under the interaction of atom and field in squeezed vacuum library is studied.The effects of the initial state coefficients of atoms and the squeezing coefficients of squeezed vacuum libraries on quantum entanglement and quantum discord are analyzed.Finally, the existence time of quantum discord is longer than that of quantum entanglement when the initial state coefficient of atom is the same as the squeezing coefficient of squeezed vacuum library.
【学位授予单位】：天津工业大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：O413

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