Dissertation > Excellent graduate degree dissertation topics show

Quantum Phase Gate and Slow Light Based on Electromagnetically Induced Transparency and Coherent Raman Gain

Author: WangDaWei
Tutor: WuJinHui
School: Jilin University
Course: Optics
Keywords: Electromagnetically induced transparency Raman gain Slow light Kerr nonlinearity Quantum phase gate GHZ states
CLC: O431.2
Type: Master's thesis
Year: 2010
Downloads: 105
Quote: 0
Read: Download Dissertation

Abstract


Interaction between light and matter as a basic phenomenon, atomic coherence effect can be used to achieve slow light and optical nonlinearity increases, so does the photon as the carrier of quantum information processing has a very important application and received wide attention. In recent years, based on atomic coherence effects, scientists have proposed a number of innovative ideas, such as: all-optical switch, the quantum phase gate, quantum non-destructive measurements, all-optical quantum computing. These goals are based on optical nonlinearity based, in particular, third-order Kerr nonlinearity has a pivotal role. In general, the optical medium, nonlinear effect is very weak, and accompanied by a variety we tried to avoid the linear and nonlinear absorption. However, the electromagnetically induced transparency (EIT) technology can simultaneously achieve enhanced absorption weakened and optical nonlinearity. Only in the EIT system to make two low light (as qubits) nonlinear coupling between the significantly enhanced need more stringent conditions, which is the need to make the probe light and the signal light is slightly off two-photon resonance condition. In this paper we analyzed separately driven by a coherent four-level, and a five-level system, discussed and analyzed in a four-level system to achieve slow light through Raman gain program; at five-level system using EIT Raman gain to achieve the effect and slow light and optical nonlinear enhancement possibilities, as well as the realization of the quantum phase gate. This thesis is divided into four parts, as follows: 1. Introduce atomic coherence effects, especially electromagnetically induced transparency. Based on electromagnetically induced transparency and slow light and enhance the development and status of Kerr nonlinearity to do the introduction. 2 introduces the basic theory of atomic coherence tools: light and semi-classical theory of atomic interactions. And as a basis of a two-level three-level electromagnetically induced transparency and absorption and dispersion properties of the system. 3 presents an experiment feasible weak microwave field-driven four-level system and the system proposed for the mechanism to achieve the speed of light with the Raman gain slows down, and eventually slow down the speed of light is theoretically confirmed the feasibility of the program. 4 presents an experimentally feasible, symmetrical five-level atomic system, and to propose two solutions for this system (EIT program, Raman gain program) to achieve enhanced Kerr nonlinearity, and make two weak Field matching between the group velocity; cross-phase modulation reaches π, and for polarization quantum phase gate operation. Finally, the use of a two-qubit quantum phase gate, single-qubit Hadamard gates and optical delay line to achieve the three-photon GHZ entanglement approach.

Related Dissertations

  1. Theoretical Study on Microring Resonators Based All Optical Buffers,TN256
  2. Study on Quantum Interference Effect in a Multi-level Atomic System,O431.2
  3. Application of Cross-Kerr Medium in Quantum Information,O431.2
  4. The Wave Mixing and Slow Light Time Space Soliton Based on the EIT Effect,O437
  5. Experimental Study of Optical Field Line Width to Atomic Coherent Effect Influence,O431.2
  6. Investigation on the Nonlinear Effect in the Process of the Interaction between Polarized Light and Multi-level Atoms,O431.2
  7. Based on liquid -core optical fiber Raman detection of methane Key Technology Research,O437.3
  8. Controllable Group Velocity of Light and Distortion in Erbiumdoped Optical Fiber,TN253
  9. Research on Properties and Dynamic Tuning of Slow Light in Two Dimension Photoniccrystal Waveguide,O734
  10. Multi- level atoms in the driving field and photonic crystals and absorption of radiation,O741
  11. The Optical Properties of Atomic System Under the Background of the Vacuum Radiation,O431.2
  12. Study on Slow Light and Temperature Sensing Via Stimulated Brillouin Scattering in Optical Fibers,TN929.11
  13. Investigation on Slow Light in Semiconductor Optical Amplifiers,TN722
  14. Single-photon Transport Property in Circuit QED,O413.2
  15. Active Raman gain mechanism Doppler effect causes the gain spectrum narrowed and enlarged and enhanced the speed of light,O431.2
  16. Researching of Optical Switching Based on Photonic Crystal Waveguides,TN25
  17. Study of Stimulated Raman Scatteringand Four-Wave Mixing in Photonic Crystal Fibers,O437.3
  18. Laser Cooling and Trapping and Two Photos Absorption via Quantum Interference,O431.2
  19. The Investigation of Continuous-Wave Four-Wave Mixing Based on Electromagnetically Induced Transparency Effect,TN252
  20. Simulation and Optimization of Distributed Fiber Raman Amplifiers,TN722

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