Dissertation > Excellent graduate degree dissertation topics show

Preparation of entangled states and entanglement degree calculation

Author: HeZhi
Tutor: LongChaoYun
School: Guizhou University
Course: Theoretical Physics
Keywords: Entanglement Swapping Cavity field Classical field Two-photon Tavis-Cummings model Quantum entanglement Part of the entropy of entanglement Symbiotic entanglement degree
CLC: O431.2
Type: Master's thesis
Year: 2008
Downloads: 217
Quote: 0
Read: Download Dissertation

Abstract


We know that the entangled state is an essential physical resource in quantum information and quantum computing, the use of physical models to prepare entangled states seem very important. Further, when different models prepared in entangled state, its entanglement degree of size change with time changes. Size evolution over time to explore the degree of entanglement by the impact of the factors which is a very meaningful thing. This article first application of entanglement swapping, driven by a strong classical field, the study achieved a success rate of 100% in the two-atom and three atom with quantized cavity field role model of two atoms and atomic entangled state, and this model entanglement swapping is insensitive to the cavity field decay and thermal field. We then two identical two level atoms by two-photon transition Tavis-Cummings (TC) model interacting with a single mode radiation field of quantum entanglement properties. By numerical calculation and analysis of the results showed that: the TC model of the two-photon quantum entanglement than the single photon TC model quantum entanglement to maintain some better; between atoms of the two-photon TC model dipole - dipole interaction strength coefficient atomic field coupling coefficient, photon entanglement properties between two atoms and the field entropy. The main work of this paper include the following: (1) first introduces the basic concepts and theory of quantum information research status and quantum entanglement. 2 based interaction model of the atom with the quantized cavity field and classical field, respectively, to achieve the generation of entangled states of the two atoms and atomic entanglement swapping method. 3 to discuss the two-photon Tavis-Cummings model of quantum entanglement. The innovation of this paper is that we first cavity QED-based framework to achieve a two-atom entangled states and entangled states of triatomic produce entanglement swapping. This program has two benefits: 1. Preparation of entangled states of the cavity field decay and thermal field is not sensitive; 2. Program prepared two-atom entangled states and three atomic entangled state to a 100% success rate. Then we use the part of the entropy of entanglement, symbiotic entanglement degree of quantum entanglement in two-photon TC model. The results show that: come to the quantum entanglement of two-photon TC model than the single-photon TC model of quantum entanglement to maintain better analysis the TC model between atoms of the two-photon dipole - dipole interaction strength coefficient, atomic and field coupling coefficient, photon entanglement properties of two atoms and the field entropy.

Related Dissertations

  1. Generation of Entangled Coherent States,O431.2
  2. Quantum Decoherence in Dissipative Cavity System,O413.1
  3. The Investigation of Photonic Crystal One-Atom Laser by Quantum Theory,O431.2
  4. The Design and Analysis of Quantum Secure Direct Communication Protocol,TN918.1
  5. Preparation of Quantum Entangled States in Cavity QED System,O431.2
  6. Research on Parametric Spectrum of Periodically Poled Crystal,O431.2
  7. Quantum Entanglement and Fideliy in the System of the Light and Substance Interact,O431.2
  8. Application of Cross-Kerr Medium in Quantum Information,O431.2
  9. The Entanglement Dynamics of Two Moving Atoms Interacting with Optical Fields,O431.2
  10. Entanglement Properties of the Coupled Qubits with Non-Markovian Environment,O511.4
  11. Anisotropic XY chain with DM interaction quantum phase transitions , quantum entanglement and thermal entanglement,O413
  12. Entanglement Controlling and Information Processing of Two Typical Quantum Systems,O431.2
  13. Entanglement Dynamics of Jaynes-Cummings Atoms,O413.1
  14. The Entanglement Measure of Multi-qubit Pure State in Quantum Error-correcting Code,O413.1
  15. Two-field Dynamics Generated by the Time-dependent Interaction with One Atom,O431.2
  16. The study of quantum secret sharing scheme,O431.2
  17. Sudden Death of Entanglement in Bipartite Quantum Systems,O431.2
  18. Regulation based on quantum teleportation,O413
  19. Design and Analysis of Quantum Network Communication Protocols for Data Link Layer,TN919.2
  20. Quantum Entanglement Properties in Heisenberg Spin Models with Dzyaloshinskii-Moriya Interaction,O413.1
  21. Theoretical Studies on Quantum Entanglement Based on Four-wave Mixing,O431.2

CLC: > Mathematical sciences and chemical > Physics > Optics > The light nature of the theory > Quantum optics
© 2012 www.DissertationTopic.Net  Mobile