Dissertation > Excellent graduate degree dissertation topics show

Preparation of Multi-qubit Entangled States Via Atomic Cavity QED

Author: LiuGuiYun
Tutor: KuangLeMan
School: Hunan Normal University
Course: Optics
Keywords: quantum entanglement cavity QED entangled state beam splitter Mach-Zehnder interferometer
CLC: O431.2
Type: Master's thesis
Year: 2009
Downloads: 62
Quote: 0
Read: Download Dissertation

Abstract


Quantum entanglement is one of the most striking and unimaginable feature for quantum physics differentiating from classical physics.Preparation and manipulation of quantum entangled states lies at the heart of the quantum information.Quantum entanglement play an important role and used widely as a principal resource in quantum teleportation,quantum dense coding, quantum key distribution,quantum computation,and so on.The process of performing quantum information can be regarded as the process of manipulation of entangled states.Quantum entanglement play a crucial role in testing the foundmental principles of quantum mechanies.Bipartite entangled states have been known very well by scientists and some of generation schemes have been proposed.However,multipartite entangled states are still under research. To investigate fully quantum entanglement is vital for both quantum theory and quantum information science.In this thesis,we focus our research on generation of atomic qubits entangled states via Cavity-QED.We propose a theoretical scheme to generate genuine entangled states of four atomic qubits in separated optical cavities using the atom-light interaction under the condition of the large detuning and single photon detections.We show that GESs of four atomic qubits can be produced deterministically.Starting with one prepared GES we have found the sixteen orthonormal and independent GESs.It is show that these sixteen GESs build a new type of representation the four-qubit system,the genuine entangled-state representation.This representation provides us with new interesting insight into better understanding multipartite entanglement.It is indicate that the GHZ state and W state,the cluster state,and the symmetric Dicke state for a four-qubit system can be explicitly expressed in terms of the sixteen GESs.We also consider the influence of the imperfection of photodetectors in the scheme,and indicated that the inefficiency of photodetectors does not affect the quality of the generated entangled states,but it decreases the success probability. We present a cavity-QED-based scheme to generate GHZ state and W state for multi-qubit atoms.The scheme makes use of linear optical devices and also has an ideal success probability of 100%.We utilize the N-type atomic off-resonant interaction with two classical fields and a single-photon source to realize the Hadamard operation and control phase operation.By controlling the interaction sequence and properly preparing the initial state of the atoms,we can easily produce entangled states of atomic qubits.

Related Dissertations

  1. Generation of Entangled Coherent States,O431.2
  2. Quantum Decoherence in Dissipative Cavity System,O413.1
  3. Transmission of Polarized Photons in Atmosphere and Interaction between Single Photons and Cavity-quantum Dots,O431.2
  4. The Generation of Entanglement State and the Implementation of Phase Gate Base on Faraday Rotation and Cavity QED System,O431.2
  5. The Design and Analysis of Quantum Secure Direct Communication Protocol,TN918.1
  6. Preparation of Quantum Entangled States in Cavity QED System,O431.2
  7. Research on Parametric Spectrum of Periodically Poled Crystal,O431.2
  8. Research of Quantum Information Processing Via Superconducting Quantum Interference Device in Cavity QED,O413.2
  9. Generating and Keeping Coherence Characteristics of Multipartitile Entangment State in Cavity QED,O431.2
  10. Quantum Entanglement and Fideliy in the System of the Light and Substance Interact,O431.2
  11. Application of Cross-Kerr Medium in Quantum Information,O431.2
  12. The Entanglement Dynamics of Two Moving Atoms Interacting with Optical Fields,O431.2
  13. Quantum Information Processing in Multiple Systems,TP274
  14. Entanglement Properties of the Coupled Qubits with Non-Markovian Environment,O511.4
  15. Anisotropic XY chain with DM interaction quantum phase transitions , quantum entanglement and thermal entanglement,O413
  16. Entanglement Controlling and Information Processing of Two Typical Quantum Systems,O431.2
  17. The Transfer of Arbitrary Two Qubit Pure State in the Spin Chains,O413
  18. Entanglement Dynamics of Jaynes-Cummings Atoms,O413.1
  19. Delay line interferometer based on differential phase-shift keying demodulator of,TN929.11
  20. The Entanglement Measure of Multi-qubit Pure State in Quantum Error-correcting Code,O413.1
  21. Study of Cavity Field Effect on the Quantum Purification,O413.1

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