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ESD and ESB in Two-Qutrit System and Three-Qubit System

Author: WeiQiao
Tutor: LiGaoXiang
School: Central China Normal University
Course: Theoretical Physics
Keywords: Multi-particle entanglement Spontaneous emission Decoherence Entanglement sudden death Entanglement recovery
CLC: O413.1
Type: Master's thesis
Year: 2009
Downloads: 83
Quote: 0
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Abstract


Quantum entanglement is a quantum information and quantum computing an important resource , entangled entanglement dynamics is an important aspect of the study , in general, is the study of quantum entanglement dynamics of quantum entanglement time evolution of the law. Quantum entanglement of the evolution of the dynamic help people grasp the quantum entanglement from quantum information processing in the state , and thus for the accurate application of quantum entanglement of quantum information processing provides a theoretical basis . Quantum decoherence and quantum entanglement dynamics are two related issues. Excited atoms interact with the environment lead to spontaneous emission , spontaneous emission will cause decoherence , which led to a change in quantum entanglement . Under certain conditions , may even be a quantum entanglement sudden death or revival . This paper studies two V- qutrit ( three-level atom ) systems and three qubit ( two-level atom ) system entanglement evolution analyzed spontaneous emission and quantum coherence effects on the evolution of entanglement , and the entanglement sudden causes of death and resuscitation to do a preliminary study . Study include : first chapter outlines the definition of quantum entanglement , nature and metrics , introduced quantum entanglement sudden death and revival . Chapter II were investigated two near and distant V-type three-level system of entanglement evolution is analyzed on the three-level system decoherence entanglement influence mortality and recovery , and short-range three-level system and far from the three -level system evolution can be compared. Chapter by theoretical calculation , given three two -level atomic system density matrix element analytical expression ; Subsequently, respectively GHZ state and W state , for example, analyzed the spontaneous emission of different initial states of three-particle entanglement system effects , and the entanglement causes of death and resuscitation . Chapter IV of the full text summing up the work , and as pointed out the direction for further research .

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CLC: > Mathematical sciences and chemical > Physics > Theoretical Physics > Quantum theory > Quantum mechanics ( wave mechanics,matrix mechanics )
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